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Gemstones, Minerals & Fossils
Gemstones and Minerals
❓Your Mineral Identification Questions answered here
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<blockquote data-quote="user 4386" data-source="post: 388811" data-attributes="member: 4386"><p>It is tricky with such dark photos - also it is a good idea to quote their properties like hardness when asking (see separate section). Even experienced geos sometimes have problems when they are actually holding the specimens so remote identification like this requires all the additional info we can get (photos may ber essential, but they are often of very little use except in reducing hundreds of possibilities to a dozen or so). However they look like they have sub-conchoidal fracture and are very fine-grained, so they are probably essentially silica rocks of some type (eg microquartz = chalcedony), which scratching them to test hardness will tell you. Such as banded cherts etc.</p></blockquote><p></p>
[QUOTE="user 4386, post: 388811, member: 4386"] It is tricky with such dark photos - also it is a good idea to quote their properties like hardness when asking (see separate section). Even experienced geos sometimes have problems when they are actually holding the specimens so remote identification like this requires all the additional info we can get (photos may ber essential, but they are often of very little use except in reducing hundreds of possibilities to a dozen or so). However they look like they have sub-conchoidal fracture and are very fine-grained, so they are probably essentially silica rocks of some type (eg microquartz = chalcedony), which scratching them to test hardness will tell you. Such as banded cherts etc. [/QUOTE]
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Gemstones, Minerals & Fossils
Gemstones and Minerals
❓Your Mineral Identification Questions answered here
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