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Gemstones, Minerals & Fossils
Gemstones and Minerals
❓Your Mineral Identification Questions answered here
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<blockquote data-quote="Lefty" data-source="post: 403106" data-attributes="member: 2976"><p>Yeah, I'm not sure how to explain it either. Perhaps someone else here might have an idea. One thing I've noticed is that sapphires from other pars of the world often (though not always) seem more of a pastel shade than ours. I don't think there's any chemical difference between black spinel and coloured spinel, I think they are both magnesium aluminum oxide - maybe there's a relationship between our more deeply coloured sapphires and our spinel that accompanies them usually being black?</p></blockquote><p></p>
[QUOTE="Lefty, post: 403106, member: 2976"] Yeah, I'm not sure how to explain it either. Perhaps someone else here might have an idea. One thing I've noticed is that sapphires from other pars of the world often (though not always) seem more of a pastel shade than ours. I don't think there's any chemical difference between black spinel and coloured spinel, I think they are both magnesium aluminum oxide - maybe there's a relationship between our more deeply coloured sapphires and our spinel that accompanies them usually being black? [/QUOTE]
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Gemstones, Minerals & Fossils
Gemstones and Minerals
❓Your Mineral Identification Questions answered here
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