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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: 507047" data-attributes="member: 4386"><p>"has tested beryl over and over" - I assume that you mean the SG has been tested multiple times, as that is the only thing that appears anomalous for topaz?</p><p></p><p>It is the combination of the crystal structure and chemical composition that determines what a mineral is. Things like SG and RI do not, but are nevertheless commonly diagnostic. Optical properties would also probably be diagnostic (but are also not part of the definition - it is just that composition and crystal structure in turn influence RI, SG and optical properties.</p><p></p><p>You have referred before to manganese but I don't think you have mentioned why you think manganese is relevant. The crystals you show no sign of alteration, and I am not aware of manganese ever entering the crystal lattice of topaz, so I would not think it has any relevance.</p><p></p><p>It is fairly clearly not beryl, but of course there might be possibilities other than topaz and beryl that we have not considered. However my money is on topaz, and my suspicion would always be with SG determination - however if you are certain of that, I can't offer any other suggestions.</p></blockquote><p></p>
[QUOTE="user 4386, post: 507047, member: 4386"] "has tested beryl over and over" - I assume that you mean the SG has been tested multiple times, as that is the only thing that appears anomalous for topaz? It is the combination of the crystal structure and chemical composition that determines what a mineral is. Things like SG and RI do not, but are nevertheless commonly diagnostic. Optical properties would also probably be diagnostic (but are also not part of the definition - it is just that composition and crystal structure in turn influence RI, SG and optical properties. You have referred before to manganese but I don't think you have mentioned why you think manganese is relevant. The crystals you show no sign of alteration, and I am not aware of manganese ever entering the crystal lattice of topaz, so I would not think it has any relevance. It is fairly clearly not beryl, but of course there might be possibilities other than topaz and beryl that we have not considered. However my money is on topaz, and my suspicion would always be with SG determination - however if you are certain of that, I can't offer any other suggestions. [/QUOTE]
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Gemstones, Minerals & Fossils
Gemstones and Minerals
❓Your Mineral Identification Questions answered here
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