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Treasure Hunting
Finds Identification and Valuation
Please help identify this green and white beauty
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<blockquote data-quote="user 4386" data-source="post: 416755" data-attributes="member: 4386"><p>They are not really different things (except that the colour is wrong to be chrysoprase). Banded chert, chrysoprase, common opal, onyx, chalcedony, even agate are just names for chalcedony (microquartz) or opaline silica (or both together) that show slightly different colour patterns and colours and thicknesses of banding. Whatever you want to call it, it is a very attractive specimen. Onyx would be a possible alternative name (not concentric enough banding for agate, wrong colour for chrysoprase). I tend to call it chert because it is such a large mass that it looks like it comes from a thick layer of rock (and chert is a rock name, the others are not). If you knew where it came from you would potentially have a very nice facing stone for slabbing.</p></blockquote><p></p>
[QUOTE="user 4386, post: 416755, member: 4386"] They are not really different things (except that the colour is wrong to be chrysoprase). Banded chert, chrysoprase, common opal, onyx, chalcedony, even agate are just names for chalcedony (microquartz) or opaline silica (or both together) that show slightly different colour patterns and colours and thicknesses of banding. Whatever you want to call it, it is a very attractive specimen. Onyx would be a possible alternative name (not concentric enough banding for agate, wrong colour for chrysoprase). I tend to call it chert because it is such a large mass that it looks like it comes from a thick layer of rock (and chert is a rock name, the others are not). If you knew where it came from you would potentially have a very nice facing stone for slabbing. [/QUOTE]
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Treasure Hunting
Finds Identification and Valuation
Please help identify this green and white beauty
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