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John Faithfull 🌍🇪🇺🏴󠁧󠁢󠁳󠁣󠁴󠁿🧡✊🏻✊🏿<p><a href="https://mastodon.scot/tags/MinCup24" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MinCup24</span></a> Copper vs Perovskite - hard to choose a favourite today!🤔 Meanwhile, here's a very nice native copper specimen from the Carboniferous basalts of Boyleston Quarry, Barrhead. 🤩 This locality has produced t he finest Scottish copper specimens. This one is about 10 cm long, and in the <a href="https://mastodon.scot/tags/Hunterian" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Hunterian</span></a> collections at University of Glasgow... <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/Mineralogy" class="mention hashtag" rel="nofollow noopener" target="_blank">#<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 beautifully zoned epidote crystal with an older brown allanite core in Lewisian gneiss from the summit of Dun I, the highest point on Iona. From the <a href="https://mastodon.scot/tags/Hunterian" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Hunterian</span></a> collections in Glasgow. Field of view about 0.5mm across. See Alt text for more... <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/Iona" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Iona</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/Lewisian" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Lewisian</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/Mineralogy" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Mineralogy</span></a></p>
John Faithfull🌍🇪🇺🏴󠁧󠁢󠁳󠁣󠁴󠁿🧡 ✊🏼✊🏿<p><a href="https://mastodon.social/tags/MinCup23" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MinCup23</span></a> <a href="https://mastodon.social/tags/Arsenuranospathite" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Arsenuranospathite</span></a> vs <a href="https://mastodon.social/tags/neptunite" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>neptunite</span></a>. Arsenuranospathite has a splendidly bonkers name, but I'm going for neptunite. The neptunite in this specimen in the <a href="https://mastodon.social/tags/Hunterian" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Hunterian</span></a> museum collections, from San Benito, California, has a δ41K potassium isotope ratio of 0.21‰± 0.06. It's probably the only specimen of neptunite on Earth for which the potassium isotope ratio is known 😊 🤓 See <a href="https://pubs.rsc.org/en/content/articlelanding/2018/ja/c7ja00257b" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">pubs.rsc.org/en/content/articl</span><span class="invisible">elanding/2018/ja/c7ja00257b</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/Mineral" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Mineral</span></a> <a href="https://mastodon.social/tags/Isotopes" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Isotopes</span></a></p>
John Faithfull🌍🇪🇺🏴󠁧󠁢󠁳󠁣󠁴󠁿🧡 ✊🏼✊🏿<p><span class="h-card" translate="no"><a href="https://fosstodon.org/@silicatefondue" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>silicatefondue</span></a></span> <span class="h-card" translate="no"><a href="https://calckey.club/@jolyon" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>jolyon</span></a></span> This specimen of <a href="https://mastodon.social/tags/sapphirine" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>sapphirine</span></a> with phlogopite from Fiskenaesset, Greenland was given by Giesecke himself to the Scottish mineralogist and collector, Thomas Brown (1774-1853). His collections are mostly in the <a href="https://mastodon.social/tags/Hunterian" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Hunterian</span></a> museum, University of Glasgow. <a href="https://www.gla.ac.uk/collections/#/details?irn=20699&amp;catType=C&amp;referrer=/results&amp;q=sapphirine" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">gla.ac.uk/collections/#/detail</span><span class="invisible">s?irn=20699&amp;catType=C&amp;referrer=/results&amp;q=sapphirine</span></a></p>
John Faithfull🌍🇪🇺🏴󠁧󠁢󠁳󠁣󠁴󠁿🧡 ✊🏼✊🏿<p>Soft sediment folds for <a href="https://mastodon.social/tags/FoldFriday" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>FoldFriday</span></a> These gorgeous blocks of downslope slump folds, with a syn-sedimentary, mini erosive unconformity above, are from the Upper Ordovician Ardwell Farm Formation, exposed on the shore south of <a href="https://mastodon.social/tags/Girvan" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Girvan</span></a>. <a href="https://mastodon.social/tags/Hunterian" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Hunterian</span></a> museum collections. <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/Sedimentology" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Sedimentology</span></a> <a href="https://mastodon.social/tags/FridayFold" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>FridayFold</span></a></p>