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Gemstones, Minerals & Fossils
Gemstones and Minerals
unknown find from slatey
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<blockquote data-quote="user 4386" data-source="post: 288748" data-attributes="member: 4386"><p>Are you and your mates on gas exploration? <strong>Nope, mainly gold - the gemstones are more an interest for me personally, opals to a greater degree, gold is bread and butter.</strong></p><p></p><p> I didn't think we were likely to see the formation of banded agate with quartz crystal centres in the middle of a piece of pet wood <em>without</em> related thermal activity. Perhaps the wood was already fossilized and the hollows and cracks were later filled by hot silica-saturated water at the time of the eruptions. Is there such a thing as "cold" agate formation? <strong>Yes, cold is perhaps the most common, and quartz crystals can form from cold water. Keep in mind too that ordinary groundwater gets warmer underground without any need for volcanic activity (eg increases around 30 degrees per km, but in western Queensland reaches boiling temperatures at one km). The heat is from radioactive decay, not from volcanic activity.</strong></p></blockquote><p></p>
[QUOTE="user 4386, post: 288748, member: 4386"] Are you and your mates on gas exploration? [b]Nope, mainly gold - the gemstones are more an interest for me personally, opals to a greater degree, gold is bread and butter.[/b] I didn't think we were likely to see the formation of banded agate with quartz crystal centres in the middle of a piece of pet wood [i]without[/i] related thermal activity. Perhaps the wood was already fossilized and the hollows and cracks were later filled by hot silica-saturated water at the time of the eruptions. Is there such a thing as "cold" agate formation? [b]Yes, cold is perhaps the most common, and quartz crystals can form from cold water. Keep in mind too that ordinary groundwater gets warmer underground without any need for volcanic activity (eg increases around 30 degrees per km, but in western Queensland reaches boiling temperatures at one km). The heat is from radioactive decay, not from volcanic activity.[/b] [/QUOTE]
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Gemstones, Minerals & Fossils
Gemstones and Minerals
unknown find from slatey
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