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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: 400290" data-attributes="member: 4386"><p>It is quite common. Sometimes they are the same age, but commonly they are simply formed in the same area at different times. Often the gems will just be associated with one generation. So in central Victoria we get trachytes, basalts, scoria cones (which are really a form of basalt) and even ultramafic flows next to each other - eg around Daylesford, or Woodend. Most of the sapphires are associated with the basalts in that area, as are large zircons and sometimes agates.</p><p></p><p>We even talk about areas of "bimodal volcanism". where for example everything is either very felsic or basaltic and formed simultaneously.</p></blockquote><p></p>
[QUOTE="user 4386, post: 400290, member: 4386"] It is quite common. Sometimes they are the same age, but commonly they are simply formed in the same area at different times. Often the gems will just be associated with one generation. So in central Victoria we get trachytes, basalts, scoria cones (which are really a form of basalt) and even ultramafic flows next to each other - eg around Daylesford, or Woodend. Most of the sapphires are associated with the basalts in that area, as are large zircons and sometimes agates. We even talk about areas of "bimodal volcanism". where for example everything is either very felsic or basaltic and formed simultaneously. [/QUOTE]
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Gemstones, Minerals & Fossils
Gemstones and Minerals
❓Your Mineral Identification Questions answered here
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