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#Metamorphic

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bse<p>"Bevan started his geological work in <a href="https://toad.social/tags/metamorphic" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>metamorphic</span></a> <a href="https://toad.social/tags/petrology" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>petrology</span></a>, and his PhD centered on stability of siderite and metamorphism of iron formations in the Minnesota iron range. At a geological conference in Minneapolis[...], Bevan gave a talk about his thesis work there, which attracted a smart lady who was working for an iron-mining company. Two years later they married. Mary Hill French became a close partner in editing [his] manuscripts and joined in all the travels around the world." <a href="https://toad.social/tags/geology" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>geology</span></a></p>
John Faithfull 🌍🇪🇺🏴󠁧󠁢󠁳󠁣󠁴󠁿🧡✊🏻✊🏿<p><a href="https://mastodon.scot/tags/FoldFriday" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>FoldFriday</span></a> or is it <a href="https://mastodon.scot/tags/FridayFold" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>FridayFold</span></a> ? Anyway , freshly bathed in this morning's early light, here's a lovely wee fold in kyanite-grade Moine schists above Loch Assapol in Mull. Fingertip at left for scale. 😊🥰 <a href="https://mastodon.scot/tags/Geology" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Geology</span></a> <a href="https://mastodon.scot/tags/Mull" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Mull</span></a> <a href="https://mastodon.scot/tags/Metamorphic" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Metamorphic</span></a></p>
John Faithfull 🌍🇪🇺🏴󠁧󠁢󠁳󠁣󠁴󠁿🧡✊🏻✊🏿<p>Just in time for a slightly late <a href="https://mastodon.scot/tags/ThinSectionThursday" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ThinSectionThursday</span></a>! Here's some fabulous piemontite: a manganese epidote mineral that shows amazing pink-yellow-plum pleochroic colour change. The two images below show the same grains under plane polarized light, but rotated through 90 degrees . The clear mineral is quartz, and there are also some large flakes of very pale pink Mn-rich muscovite mica. This sample is from near Tongue, in Sutherland. <a href="https://mastodon.scot/tags/Geology" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Geology</span></a> <a href="https://mastodon.scot/tags/Metamorphic" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Metamorphic</span></a></p>
Bill Minarik<p>From Barb Dutrow, LSU:<br>...we announce the passing of a metamorphic petrology legend, Michael J. Holdaway on March 21, 2025, at 89 years.</p><p>Mike is perhaps best known for his meticulous experiments on the Al2SiO5 system and for developing the andalusite weight loss method for determining reaction direction. At Southern Methodist University his work provided experimental constraints on the triple point of the polymorphs for the first time.<br><a href="https://fosstodon.org/tags/Metamorphic" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Metamorphic</span></a> <a href="https://fosstodon.org/tags/ExperimentalPetrology" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ExperimentalPetrology</span></a> <a href="https://fosstodon.org/tags/Geoscience" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Geoscience</span></a> <a href="https://fosstodon.org/tags/Mineralogy" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Mineralogy</span></a></p>
John Faithfull 🌍🇪🇺🏴󠁧󠁢󠁳󠁣󠁴󠁿🧡✊🏻✊🏿<p><a href="https://mastodon.scot/tags/FridayFold" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>FridayFold</span></a> An old picture of a limpet enjoying some beautiful folded greenschist-facies pelite in a rock pool near Thundergay, on the west coast of Arran. The pale bands are rich in fine-grained muscovite; the dark bands also have chlorite. The few rusty spots mark the position of pyrite crystals. </p><p><a href="https://mastodon.scot/tags/Geology" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Geology</span></a> <a href="https://mastodon.scot/tags/Deformation" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Deformation</span></a> <a href="https://mastodon.scot/tags/Folding" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Folding</span></a> <a href="https://mastodon.scot/tags/Metamorphic" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Metamorphic</span></a> <a href="https://mastodon.scot/tags/Dalradian" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Dalradian</span></a> <a href="https://mastodon.scot/tags/Arran" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Arran</span></a></p>
John Faithfull 🌍🇪🇺🏴󠁧󠁢󠁳󠁣󠁴󠁿🧡✊🏻✊🏿<p>Out looking at metamorphic rocks on the south coast of Mull last week. We weren't expecting an ostrich! 🤯 🤩 😁 <a href="https://mastodon.scot/tags/Pareidolia" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Pareidolia</span></a> <a href="https://mastodon.scot/tags/ThingsThatLookLikeOtherThings" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ThingsThatLookLikeOtherThings</span></a> <a href="https://mastodon.scot/tags/Mull" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Mull</span></a> <a href="https://mastodon.scot/tags/Ostrich" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Ostrich</span></a> <a href="https://mastodon.scot/tags/Moine" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Moine</span></a> <a href="https://mastodon.scot/tags/Metamorphic" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Metamorphic</span></a></p>
John Faithfull 🌍🇪🇺🏴󠁧󠁢󠁳󠁣󠁴󠁿🧡✊🏻✊🏿<p>Fabulous spring weather in Mull just now. ☀️ Here's a picture of the extreme south end of the Hebridean Craton: Lewisian rocks on on a wee island off Iona, which I visited for the first time this week 🤩 🥰 🤓 😎 Greenland and Canada in the distance 😁 <a href="https://mastodon.scot/tags/Geology" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Geology</span></a> <a href="https://mastodon.scot/tags/Lewisian" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Lewisian</span></a> <a href="https://mastodon.scot/tags/Metamorphic" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Metamorphic</span></a></p>
John Faithfull 🌍🇪🇺🏴󠁧󠁢󠁳󠁣󠁴󠁿🧡✊🏻✊🏿<p><a href="https://mastodon.scot/tags/DogWalkingGeology" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>DogWalkingGeology</span></a> Spud is admiring this lovely shingle-polished outcrop of Moine schist on the beach at Ardalanish, Mull. <a href="https://mastodon.scot/tags/Metamorphic" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Metamorphic</span></a> <a href="https://mastodon.scot/tags/Mull" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Mull</span></a></p>
💧🌏 Greg Cocks<p>The GEOROC Database (Geochemistry of Rocks of the Oceans and Continents)<br />--<br /><a href="https://georoc.eu/georoc/new-start.asp" target="_blank" rel="nofollow noopener" translate="no"><span class="invisible">https://</span><span class="">georoc.eu/georoc/new-start.asp</span><span class="invisible"></span></a> &lt;-- shared link to GEOROC resource<br />--<br />H/T Paul Cleverley glasses curly blonde hair<br />“The GEOROC Database (Geochemistry of Rocks of the Oceans and Continents) is a comprehensive collection of published analyses of igneous and metamorphic rocks and minerals. It contains major and trace element concentrations, radiogenic and nonradiogenic isotope ratios as well as analytical ages for whole rocks, glasses, minerals and inclusions. Metadata include geospatial and other sample information, analytical details and references….<br />Current content of GEOROC:<br /> • 22,750 papers<br /> • 685,660 samples<br /> • 2,680,100 analyses<br /> • 39,334,100 single data values…”<br /><a href="https://techhub.social/tags/opendata" class="mention hashtag" rel="tag">#<span>opendata</span></a> <a href="https://techhub.social/tags/geology" class="mention hashtag" rel="tag">#<span>geology</span></a> <a href="https://techhub.social/tags/geoscience" class="mention hashtag" rel="tag">#<span>geoscience</span></a> <a href="https://techhub.social/tags/GEOROC" class="mention hashtag" rel="tag">#<span>GEOROC</span></a> <a href="https://techhub.social/tags/database" class="mention hashtag" rel="tag">#<span>database</span></a> <a href="https://techhub.social/tags/global" class="mention hashtag" rel="tag">#<span>global</span></a> <a href="https://techhub.social/tags/igneous" class="mention hashtag" rel="tag">#<span>igneous</span></a> <a href="https://techhub.social/tags/metamorphic" class="mention hashtag" rel="tag">#<span>metamorphic</span></a> <a href="https://techhub.social/tags/rocks" class="mention hashtag" rel="tag">#<span>rocks</span></a> <a href="https://techhub.social/tags/minerals" class="mention hashtag" rel="tag">#<span>minerals</span></a> <a href="https://techhub.social/tags/geochemistry" class="mention hashtag" rel="tag">#<span>geochemistry</span></a> <a href="https://techhub.social/tags/results" class="mention hashtag" rel="tag">#<span>results</span></a> <a href="https://techhub.social/tags/analyses" class="mention hashtag" rel="tag">#<span>analyses</span></a> <a href="https://techhub.social/tags/published" class="mention hashtag" rel="tag">#<span>published</span></a> <a href="https://techhub.social/tags/metadata" class="mention hashtag" rel="tag">#<span>metadata</span></a> <a href="https://techhub.social/tags/spatial" class="mention hashtag" rel="tag">#<span>spatial</span></a> <a href="https://techhub.social/tags/GIS" class="mention hashtag" rel="tag">#<span>GIS</span></a> <a href="https://techhub.social/tags/mapping" class="mention hashtag" rel="tag">#<span>mapping</span></a> <a href="https://techhub.social/tags/papers" class="mention hashtag" rel="tag">#<span>papers</span></a> <a href="https://techhub.social/tags/samples" class="mention hashtag" rel="tag">#<span>samples</span></a> <a href="https://techhub.social/tags/datavalues" class="mention hashtag" rel="tag">#<span>datavalues</span></a></p>
John Faithfull 🌍🇪🇺🏴󠁧󠁢󠁳󠁣󠁴󠁿🧡✊🏻✊🏿<p><a href="https://mastodon.scot/tags/DogWalkingGeology" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>DogWalkingGeology</span></a> A <a href="https://mastodon.scot/tags/LifeGoal" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>LifeGoal</span></a> achieved 🎆🕺🎉💃 Kyanite gneisses occur in the Mull Moine rocks, but I have *never* found a beach pebble of these rocks, despite searching intensely, until THIS MORNING. A very tasty cobble 😋 <a href="https://mastodon.scot/tags/Geology" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Geology</span></a> <a href="https://mastodon.scot/tags/Metamorphic" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Metamorphic</span></a> <a href="https://mastodon.scot/tags/Mull" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Mull</span></a></p>
John Faithfull 🌍🇪🇺🏴󠁧󠁢󠁳󠁣󠁴󠁿🧡✊🏻✊🏿<p><a href="https://mastodon.scot/tags/ThinSectionThursday" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ThinSectionThursday</span></a> <a href="https://mastodon.scot/tags/MinCup24" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MinCup24</span></a> It's kyanite for me! Rocks with kyanite are *always* good rocks 🤩🥰 Here's some nice bent and twinned kyanite crystals in a high-pressure granulite-facies gneiss from the Lewisian complex in South Harris. Field of view about 2mm across. More info in Alt text. <a href="https://mastodon.scot/tags/Geology" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Geology</span></a> <a href="https://mastodon.scot/tags/Kyanite" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Kyanite</span></a> <a href="https://mastodon.scot/tags/Lewisian" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Lewisian</span></a> <a href="https://mastodon.scot/tags/Metasediment" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Metasediment</span></a> <a href="https://mastodon.scot/tags/Metamorphic" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Metamorphic</span></a> <span class="h-card" translate="no"><a href="https://mastodon.social/@MineralCup" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>MineralCup</span></a></span></p>
John Faithfull 🌍🇪🇺🏴󠁧󠁢󠁳󠁣󠁴󠁿🧡✊🏻✊🏿<p><a href="https://mastodon.scot/tags/ThinSectionThursday" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ThinSectionThursday</span></a> Beautiful symplectite coronas around pink (black) garnets in this garnet-clinopyroxene-amphibole-plagioclase-scapolite gneiss from the Lewisian complex in South Harris. Field of view ca. 2mm wide. <a href="https://mastodon.scot/tags/Geology" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Geology</span></a> <a href="https://mastodon.scot/tags/Metamorphic" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Metamorphic</span></a> <a href="https://mastodon.scot/tags/Microscopy" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Microscopy</span></a> <a href="https://mastodon.scot/tags/Texture" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Texture</span></a></p>
GeologistsCat<p>When we went on <a href="https://mastodon.social/tags/hedgewatch" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>hedgewatch</span></a> in the <a href="https://mastodon.social/tags/Heide" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Heide</span></a>/#Heath. We found again <a href="https://mastodon.social/tags/windkanter" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>windkanter</span></a>/#ventifacts. This was a <a href="https://mastodon.social/tags/sandstone" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>sandstone</span></a> a <a href="https://mastodon.social/tags/sedimentary" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>sedimentary</span></a> <a href="https://mastodon.social/tags/rock" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>rock</span></a> &amp; is now a <a href="https://mastodon.social/tags/quartzite" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>quartzite</span></a> i.e. the <a href="https://mastodon.social/tags/metamorphic" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>metamorphic</span></a> equivalent. Thus it has seen high <a href="https://mastodon.social/tags/temperature" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>temperature</span></a> &amp;/or <a href="https://mastodon.social/tags/pressure" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>pressure</span></a>. The stripes are the remnants of the sedimentary layers</p><p><a href="https://mastodon.social/tags/CatForScale" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>CatForScale</span></a></p><p><a href="https://mastodon.social/tags/geologywithcats" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>geologywithcats</span></a> <a href="https://mastodon.social/tags/geology" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>geology</span></a> <a href="https://mastodon.social/tags/CatsOfMastodon" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>CatsOfMastodon</span></a></p>
John Faithfull 🌍🇪🇺🏴󠁧󠁢󠁳󠁣󠁴󠁿🧡✊🏻✊🏿<p><a href="https://mastodon.scot/tags/ThinSectionThursday" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ThinSectionThursday</span></a> Raspberry pink-to-yellow plechroic piemontite, with pale pink muscovite mica, small, clear stand-out spessartine garnets, and blandly clear quartz, in this strange Moine metasediment from Strathconon in northern Scotland. Field of view about 2mm across. The second pic shows the same view between crossed polars, showing wonderfully bright birefringence colours. More info in Alt text of images. <a href="https://mastodon.scot/tags/Geology" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Geology</span></a> <a href="https://mastodon.scot/tags/Metamorphic" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Metamorphic</span></a> <a href="https://mastodon.scot/tags/Manganese" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Manganese</span></a> <a href="https://mastodon.scot/tags/Mineralogy" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Mineralogy</span></a> <a href="https://mastodon.scot/tags/Moine" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Moine</span></a></p>
John Faithfull 🌍🇪🇺🏴󠁧󠁢󠁳󠁣󠁴󠁿🧡✊🏻✊🏿<p>Very pleased with this boulder from a beach near Bunessan. The white quartz vein cuts gently across bedding and foliation in the grey metasediment, and both are cut by the later quartz-feldspar vein with pink margins. Lovely cross-cutting relationships reveal sequence of geological events 😊🤓 <a href="https://mastodon.scot/tags/Geology" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Geology</span></a> <a href="https://mastodon.scot/tags/Mull" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Mull</span></a> <a href="https://mastodon.scot/tags/Moine" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Moine</span></a> <a href="https://mastodon.scot/tags/Stratigraphy" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Stratigraphy</span></a> <a href="https://mastodon.scot/tags/Metamorphic" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Metamorphic</span></a></p>
John Faithfull 🌍🇪🇺🏴󠁧󠁢󠁳󠁣󠁴󠁿🧡✊🏻✊🏿<p><span class="h-card" translate="no"><a href="https://mastodon.social/@PeterLBowden1" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>PeterLBowden1</span></a></span> Beautiful - those layered garnet-rich rocks are 🤩 🥰 !!! <a href="https://mastodon.scot/tags/Geology" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Geology</span></a> <a href="https://mastodon.scot/tags/Metamorphic" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Metamorphic</span></a> <a href="https://mastodon.scot/tags/Archaean" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Archaean</span></a></p>
💧🌏 Greg Cocks<p>Researchers Find Oldest Evidence Of Earth’s Magnetic Field<br />--<br /><a href="https://www.forbes.com/sites/davidbressan/2024/04/29/researchers-find-oldest-evidence-of-earths-magnetic-field/?sh=3443e1c050fb" target="_blank" rel="nofollow noopener" translate="no"><span class="invisible">https://www.</span><span class="ellipsis">forbes.com/sites/davidbressan/</span><span class="invisible">2024/04/29/researchers-find-oldest-evidence-of-earths-magnetic-field/?sh=3443e1c050fb</span></a> &lt;-- shared media article<br />--<br /><a href="https://doi.org/10.1029/2023JB027706" target="_blank" rel="nofollow noopener" translate="no"><span class="invisible">https://</span><span class="">doi.org/10.1029/2023JB027706</span><span class="invisible"></span></a> &lt;-- shared paper<br />--<br /><a href="https://techhub.social/tags/geology" class="mention hashtag" rel="tag">#<span>geology</span></a> <a href="https://techhub.social/tags/geomagnetism" class="mention hashtag" rel="tag">#<span>geomagnetism</span></a> <a href="https://techhub.social/tags/paleomagnetism" class="mention hashtag" rel="tag">#<span>paleomagnetism</span></a> <a href="https://techhub.social/tags/earth" class="mention hashtag" rel="tag">#<span>earth</span></a> <a href="https://techhub.social/tags/global" class="mention hashtag" rel="tag">#<span>global</span></a> <a href="https://techhub.social/tags/protection" class="mention hashtag" rel="tag">#<span>protection</span></a> <a href="https://techhub.social/tags/magneticfield" class="mention hashtag" rel="tag">#<span>magneticfield</span></a> <a href="https://techhub.social/tags/cosmic" class="mention hashtag" rel="tag">#<span>cosmic</span></a> <a href="https://techhub.social/tags/IsuaSupracrustalBelt" class="mention hashtag" rel="tag">#<span>IsuaSupracrustalBelt</span></a> <a href="https://techhub.social/tags/fieldwork" class="mention hashtag" rel="tag">#<span>fieldwork</span></a> <a href="https://techhub.social/tags/metamorphic" class="mention hashtag" rel="tag">#<span>metamorphic</span></a> <a href="https://techhub.social/tags/structuralgeology" class="mention hashtag" rel="tag">#<span>structuralgeology</span></a> <a href="https://techhub.social/tags/greenland" class="mention hashtag" rel="tag">#<span>greenland</span></a> <a href="https://techhub.social/tags/tectonics" class="mention hashtag" rel="tag">#<span>tectonics</span></a> <a href="https://techhub.social/tags/Eoarchean" class="mention hashtag" rel="tag">#<span>Eoarchean</span></a> <a href="https://techhub.social/tags/mineralogy" class="mention hashtag" rel="tag">#<span>mineralogy</span></a></p>
John Faithfull 🌍🇪🇺🏴󠁧󠁢󠁳󠁣󠁴󠁿🧡✊🏻✊🏿<p><a href="https://mastodon.scot/tags/ThinSectionThursday" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ThinSectionThursday</span></a> A gloriously vivid eclogite-facies rock from the Eastern Glenelg gneisses. First image is between crossed polars, with large bright flakes of muscovite mica, with grey quartz +feldspar, plus a zoned yellow-to-purple crystal of epidote in the centre of the view. Second image is same, in plane polarized light. Field of view about 2mm wide. <a href="https://mastodon.scot/tags/Geology" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Geology</span></a> <a href="https://mastodon.scot/tags/Metamorphic" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Metamorphic</span></a> <a href="https://mastodon.scot/tags/Microscopy" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Microscopy</span></a></p>
John Faithfull 🌍🇪🇺🏴󠁧󠁢󠁳󠁣󠁴󠁿🧡✊🏻✊🏿<p>The lovely Scoor Pelitic Gneiss unit looking fabulous in the winter sunshine on the south coast of Mull yesterday. It's Neoproterozoic to Caledonian in age, but exactly how many metamorphic episodes it's experienced, and when, remains a bit mysterious.🤓 😎 <a href="https://mastodon.scot/tags/Mull" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Mull</span></a> <a href="https://mastodon.scot/tags/Geology" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Geology</span></a> <a href="https://mastodon.scot/tags/Metamorphic" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Metamorphic</span></a> <a href="https://mastodon.scot/tags/Moine" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Moine</span></a></p>
John Faithfull 🌍🇪🇺🏴󠁧󠁢󠁳󠁣󠁴󠁿🧡✊🏻✊🏿<p><a href="https://mastodon.scot/tags/DogWalkingGeology" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>DogWalkingGeology</span></a> from yesterday.... Spud has found some garnet-tastic Moine metabasic tuffs(?) or maybe an intrusion. Each knobbly bit is a large garnet crystal, but alas they are never show external crystal faces, and are always stuffed with gazillions of quartz inclusions. Still, lovely to see! <a href="https://mastodon.scot/tags/Metamorphic" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Metamorphic</span></a> <a href="https://mastodon.scot/tags/Garnet" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Garnet</span></a> <a href="https://mastodon.scot/tags/Mull" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Mull</span></a> <a href="https://mastodon.scot/tags/Moine" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Moine</span></a> <a href="https://mastodon.scot/tags/Proterozoic" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Proterozoic</span></a> 😊</p>