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Gemstones, Minerals & Fossils
Gemstones and Minerals
Geology question, whats going on here.....
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<blockquote data-quote="user 4386" data-source="post: 489822" data-attributes="member: 4386"><p>I can only guess (despite you providing good photos). My guess would be something like a very high-grade metamorphic rock, a coarse-grained high-grade metamorphosed mafic (greenstone) rock now consisting pf things like large pyroxene and phlogopite (mica) crystals. What we might call granulite. The "rainbow" effect more likely formed during later weathering, and your "talcum" is probably clay formed by deep weathering.</p></blockquote><p></p>
[QUOTE="user 4386, post: 489822, member: 4386"] I can only guess (despite you providing good photos). My guess would be something like a very high-grade metamorphic rock, a coarse-grained high-grade metamorphosed mafic (greenstone) rock now consisting pf things like large pyroxene and phlogopite (mica) crystals. What we might call granulite. The "rainbow" effect more likely formed during later weathering, and your "talcum" is probably clay formed by deep weathering. [/QUOTE]
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Gemstones, Minerals & Fossils
Gemstones and Minerals
Geology question, whats going on here.....
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