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Gemstones, Minerals & Fossils
Gemstones and Minerals
Unknown Green Crystal/rocks need identifying
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<blockquote data-quote="user 4386" data-source="post: 418751" data-attributes="member: 4386"><p>"Mineral identification questions answered" is a better place for these (so I don't miss). Looks suspiciously like multiple minerals to me (perhaps even three). Crystals look like calcite so should be hardness 3 (can scratch with gold coin but not with fingernail). I suspect that the green mineral is more likely a copper mineral than chrysoprase (what is hardness)? Chrysocolla perhaps? It never forms crystals, often botryoidal, can have a conchoidal to uneven fracture, probably slightly harder than the calcite (sometimes nearly as hard as chalcedony), varies from blue to green.</p><p></p><p><a href="https://en.wikipedia.org/wiki/Chrysocolla" target="_blank">https://en.wikipedia.org/wiki/Chrysocolla</a></p><p></p><p>However there are many green copper minerals. Some are carbonates, others phosphates. For example, poor quality turquoise can be that colour, varying green to good-quality blue - commonly occurs with copper prospects, black slates, often phosphatic rocks (eg King River Valley, South Coast NSW)</p></blockquote><p></p>
[QUOTE="user 4386, post: 418751, member: 4386"] "Mineral identification questions answered" is a better place for these (so I don't miss). Looks suspiciously like multiple minerals to me (perhaps even three). Crystals look like calcite so should be hardness 3 (can scratch with gold coin but not with fingernail). I suspect that the green mineral is more likely a copper mineral than chrysoprase (what is hardness)? Chrysocolla perhaps? It never forms crystals, often botryoidal, can have a conchoidal to uneven fracture, probably slightly harder than the calcite (sometimes nearly as hard as chalcedony), varies from blue to green. [url]https://en.wikipedia.org/wiki/Chrysocolla[/url] However there are many green copper minerals. Some are carbonates, others phosphates. For example, poor quality turquoise can be that colour, varying green to good-quality blue - commonly occurs with copper prospects, black slates, often phosphatic rocks (eg King River Valley, South Coast NSW) [/QUOTE]
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Gemstones, Minerals & Fossils
Gemstones and Minerals
Unknown Green Crystal/rocks need identifying
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