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Gemstones, Minerals & Fossils
Gemstones and Minerals
please help identify these stones
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<blockquote data-quote="Lefty" data-source="post: 323000" data-attributes="member: 2976"><p><a href="https://www.mindat.org/article.php/1335/Iris+Quartz" target="_blank">Info on iris quartz here</a></p><p></p><p>Apparently caused primarily by Brazil law twinning, a property which much of the Lowmead amethyst possesses. However, amethyst is already deep purple which would make it harder to see if it was there and this version of the phenomenon looks slightly different to usual.</p><p></p><p>I think most of us have probably found quartz crystals with that rainbow effect, I've always assumed it to be fractures. The material called iris quartz displays the property more strongly than usual. First discovered in India It has since been found in a number of other places. The pieces in the link above are exceptional - they would make great faceting material, just as some opal can be faceted.</p><p></p><p>Similar phenomenon can be caused by other factors.......</p></blockquote><p></p>
[QUOTE="Lefty, post: 323000, member: 2976"] [url=https://www.mindat.org/article.php/1335/Iris+Quartz]Info on iris quartz here[/url] Apparently caused primarily by Brazil law twinning, a property which much of the Lowmead amethyst possesses. However, amethyst is already deep purple which would make it harder to see if it was there and this version of the phenomenon looks slightly different to usual. I think most of us have probably found quartz crystals with that rainbow effect, I've always assumed it to be fractures. The material called iris quartz displays the property more strongly than usual. First discovered in India It has since been found in a number of other places. The pieces in the link above are exceptional - they would make great faceting material, just as some opal can be faceted. Similar phenomenon can be caused by other factors....... [/QUOTE]
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Gemstones, Minerals & Fossils
Gemstones and Minerals
please help identify these stones
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