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Gemstones, Minerals & Fossils
Gemstones and Minerals
Confirm Rock ID - Mica Schist on Calcite
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<blockquote data-quote="Westaus" data-source="post: 290051" data-attributes="member: 2598"><p>It does look like biotite, though it appears a lot more shiny and metallic than this reference - <a href="http://geology.com/minerals/biotite.shtml" target="_blank">http://geology.com/minerals/biotite.shtml</a></p><p></p><p>I have also samples very similar to this that was in the same vicinity - <a href="http://geology.com/rocks/schist.shtml" target="_blank">http://geology.com/rocks/schist.shtml</a></p><p></p><p></p><p></p><p>It could be a version. I looked up and found this "To be called a pegmatite, a rock should be composed almost entirely of crystals that are at least one centimeter in diameter. The name pegmatite has nothing to do with the mineral composition of the rock."</p><p></p><p>So yes it does fit being a Pegmatite as the size would be in this scope and areas the volume is extensive. </p><p></p><p>I have some other samples I will try and photograph to compare to the schist above.</p><p></p><p>Cheers</p></blockquote><p></p>
[QUOTE="Westaus, post: 290051, member: 2598"] It does look like biotite, though it appears a lot more shiny and metallic than this reference - [url]http://geology.com/minerals/biotite.shtml[/url] I have also samples very similar to this that was in the same vicinity - [url]http://geology.com/rocks/schist.shtml[/url] It could be a version. I looked up and found this "To be called a pegmatite, a rock should be composed almost entirely of crystals that are at least one centimeter in diameter. The name pegmatite has nothing to do with the mineral composition of the rock." So yes it does fit being a Pegmatite as the size would be in this scope and areas the volume is extensive. I have some other samples I will try and photograph to compare to the schist above. Cheers [/QUOTE]
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Gemstones, Minerals & Fossils
Gemstones and Minerals
Confirm Rock ID - Mica Schist on Calcite
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