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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 8 matches |
| Author | Message |
|---|---|
 Topic: Harder than diamond, softer than talc |
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| CranCowan Replies: 12 Views: 14445 |
 Forum: Off-Topic and Introductions Posted: Dec 19, 2016 07:35 Subject: Re: Harder than diamond, softer than talc |
| But, CranCowan. then you forget that question is about minerals.
q-Carbon is man made, and a graphite with water is not a mineral, just an impure graphite.... For man made substances, both can b ... |
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| Topic: Harder than diamond, softer than talc |
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| CranCowan Replies: 12 Views: 14445 |
Forum: Off-Topic and Introductions Posted: Dec 19, 2016 06:24 Subject: Re: Harder than diamond, softer than talc |
| This sounds a bit like a riddle. The best answer I can think of are carbon based minerals or mineraloids. Graphite might be softer than talc if it contained enough water and q-carbon is supposed t ... | |
| Topic: Collection of Cran Cowan |
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| CranCowan Replies: 1 Views: 6395 |
Forum: Collection photos and Collector's page Posted: Oct 28, 2016 19:05 Subject: Re: Collection of Cran Cowan |
| Another specimen of Peruvian Barite on Dolomite | |
| Topic: Collection of Cran Cowan |
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| CranCowan Replies: 1 Views: 6395 |
Forum: Collection photos and Collector's page Posted: Oct 28, 2016 16:30 Subject: Collection of Cran Cowan |
| I like barite from this region. | |
| Topic: Why does Calcite fluoresce blue?? |
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| CranCowan Replies: 19 Views: 30162 |
Forum: Minerals and Mineralogy Posted: Sep 30, 2016 13:54 Subject: Re: Why does Calcite fluoresce blue?? |
| The most commonly blue fluorescing calcite (under SW) is probably the so called Terlingua-type.
It's activator is thought to be organic. (Robbins, Graft ...) |
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| Topic: What makes calcite white vs. colorless? |
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| CranCowan Replies: 6 Views: 11686 |
Forum: Minerals and Mineralogy Posted: Sep 30, 2016 13:31 Subject: Re: what makes calcite White vs. colorless? |
| The simplest reason would be Mie scattering. It's the same thing that makes clouds white vs. colorless water vapor. It's related to the size of the scattering particle (or imperfection in the case ... | |
| Topic: Please help identify this mineral/crystal. |
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| CranCowan Replies: 21 Views: 24591 |
Forum: Minerals and Mineralogy Posted: Sep 29, 2016 08:05 Subject: Re: Please help identify this mineral/crystal. |
| Sphalerite is a sulfide.....ZnS..... I thought CARBONATES dissolved in some acids such as muriatic acid (28% HCl). I never had a sphalerite show evidence of dissolving when I cleaned it.
Am I now ... |
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| Topic: Please help identify this mineral/crystal. |
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| CranCowan Replies: 21 Views: 24591 |
Forum: Minerals and Mineralogy Posted: Sep 28, 2016 23:25 Subject: Re: Please help identify this mineral/crystal. |
| Sphalerite will dissolve in muriatic acid (HCl). It produces H2S gas which smells like rotten eggs. | |
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