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A general guide for using the Forum with some rules and tips
The information provided within this Forum about localities is only given to allow reference to them. Any visit to any of the localities requires you to obtain full permission and relevant information prior to your visit. FMF is strictly against any illicit activities related to collecting minerals.
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| Search found 3 matches |
| Author | Message |
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 Topic: Twinned Topaz? |
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| Yannick Cosson Replies: 8 Views: 11979 |
 Forum: What is it? - Where is it from? Posted: Aug 14, 2022 10:42 Subject: Re: Twinned Topaz? |
| Hello, I made the test SG specific gravity: the result is 3,4 and it is the SG of TOPAZ.
In fact I have another smaller sample (2x1) from another locality: Air Niger mountains, collected in the 70s ... |
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| Topic: Twinned Topaz? |
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| Yannick Cosson Replies: 8 Views: 11979 |
Forum: What is it? - Where is it from? Posted: Jul 01, 2022 10:15 Subject: Re: Twinned Topaz? |
| Your photo shows no faces. It appears that the free ends of both crystals are damaged. Are there good sharp crystal faces anywhere, and could you show them (as many as possible) in a photograph?
... |
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| Topic: Twinned Topaz? |
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| Yannick Cosson Replies: 8 Views: 11979 |
Forum: What is it? - Where is it from? Posted: Jul 01, 2022 05:07 Subject: Twinned Topaz? |
| Twinned Topaz from Brazil. 4x3 cms. Twin in V like a bertrandite crystal ? But the twins for topaz crystals are rare and poorly documented: is it a topaz crystal? | |
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