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Gemstones, Minerals & Fossils
Gemstones, Minerals & Fossils
can anyone identify
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<blockquote data-quote="user 4386" data-source="post: 470579" data-attributes="member: 4386"><p>Except for last fossil photos. all above that are various forms of chalcedonic (microquartz) and possibly opaline silica. Attractive. Many are banded, some could probably be called agate. </p><p></p><p>And quartz does not "flow", it is deposited from a water solution layer by layer (precipitated). It is a common misconception that quartz veins are "molten" quartz that has "flowed" into fractures. Not so, it is water containing dissolved quartz that has flowed through the fractures, and as it does so quartz precipitates out on the walls of the fracture, layer by layer. Sometimes it does not fill the fracture completely and the water ends up flowing away leaving open cavities (sometimes nice quartz crystals grow into the open cavities before the last of the water is gone).</p></blockquote><p></p>
[QUOTE="user 4386, post: 470579, member: 4386"] Except for last fossil photos. all above that are various forms of chalcedonic (microquartz) and possibly opaline silica. Attractive. Many are banded, some could probably be called agate. And quartz does not "flow", it is deposited from a water solution layer by layer (precipitated). It is a common misconception that quartz veins are "molten" quartz that has "flowed" into fractures. Not so, it is water containing dissolved quartz that has flowed through the fractures, and as it does so quartz precipitates out on the walls of the fracture, layer by layer. Sometimes it does not fill the fracture completely and the water ends up flowing away leaving open cavities (sometimes nice quartz crystals grow into the open cavities before the last of the water is gone). [/QUOTE]
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Gemstones, Minerals & Fossils
Gemstones, Minerals & Fossils
can anyone identify
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