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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: 402262" data-attributes="member: 4386"><p>If it was a ruby at Broadford it would be a first I suspect, but as discussed not necessarily impossible. Rubies are a bit sparse here, sapphires are more the rule. I'm guessing it is because the red colour of ruby requires chromium, the blue (one important colour) of sapphire requires iron and titanium. The sapphires here definitely occur with basalt (rock high in iron and titanium) whereas the rubies of the world are often associated with more ultramafic rocks and high grade metamorphic rocks and limestones now altered to marble (ultramafic rocks are higher in chromium than is basalt), e.g. Burma. So both are the mineral corundum, but the colour of the corundum varies depending on how it formed.</p></blockquote><p></p>
[QUOTE="user 4386, post: 402262, member: 4386"] If it was a ruby at Broadford it would be a first I suspect, but as discussed not necessarily impossible. Rubies are a bit sparse here, sapphires are more the rule. I'm guessing it is because the red colour of ruby requires chromium, the blue (one important colour) of sapphire requires iron and titanium. The sapphires here definitely occur with basalt (rock high in iron and titanium) whereas the rubies of the world are often associated with more ultramafic rocks and high grade metamorphic rocks and limestones now altered to marble (ultramafic rocks are higher in chromium than is basalt), e.g. Burma. So both are the mineral corundum, but the colour of the corundum varies depending on how it formed. [/QUOTE]
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Gemstones, Minerals & Fossils
Gemstones and Minerals
❓Your Mineral Identification Questions answered here
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