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Gemstones, Minerals & Fossils
Gemstones and Minerals
Confirm Rock ID - Mica Schist on Calcite
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<blockquote data-quote="user 4386" data-source="post: 290049" data-attributes="member: 4386"><p>Looks like a mica schist but it could be a number of other minerals. Colour seems wrong for biotite unless very weathered (which it could be as it looks like limonite present). Can you split it easily into layers with a pocket-knife blade? Now scratch a soft face (not across the book-like pages but on a flat surface) - how soft is it compared with your fingernail, a $2 coin, the knife blade, a lump of quartz? Peel a very thin layer off - if you bend it, does it snap back into shape or keep the bent shape? Hold the thin layer up and look at a light through it - is it clear or light brown? Could there be two flaky minerals not one?</p></blockquote><p></p>
[QUOTE="user 4386, post: 290049, member: 4386"] Looks like a mica schist but it could be a number of other minerals. Colour seems wrong for biotite unless very weathered (which it could be as it looks like limonite present). Can you split it easily into layers with a pocket-knife blade? Now scratch a soft face (not across the book-like pages but on a flat surface) - how soft is it compared with your fingernail, a $2 coin, the knife blade, a lump of quartz? Peel a very thin layer off - if you bend it, does it snap back into shape or keep the bent shape? Hold the thin layer up and look at a light through it - is it clear or light brown? Could there be two flaky minerals not one? [/QUOTE]
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Gemstones, Minerals & Fossils
Gemstones and Minerals
Confirm Rock ID - Mica Schist on Calcite
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