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29 May-08:47:20 Re: twenty basic minerals (Peter Lemkin)
29 May-08:09:10 Re: collection of heimo hellwig (Heimo Hellwig)
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29 May-06:01:17 Re: cornish chalcocite but from where? (Markbeckett)
28 May-23:57:45 The mizunaka collection - calcite (Am Mizunaka)
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28 May-14:29:16 Re: collection of tobi (Pierre Joubert)
28 May-14:20:11 Re: cornish chalcocite but from where? (Gneissware)
28 May-13:16:23 Re: a mineralogical trip through the regions of the uk - england / cumbria (Jordi Fabre)
28 May-10:28:46 Re: twenty basic minerals (Gneissware)
28 May-10:09:14 Re: collection of tobi (Gneissware)
28 May-07:56:16 Re: twenty basic minerals (Bob Harman)
28 May-07:50:32 Re: twenty basic minerals (Peter Lemkin)
28 May-07:35:44 Twenty basic minerals (Tom Mazanec)
28 May-07:28:25 Re: collection of tobi (Tobi)
28 May-07:25:44 Re: cornish chalcocite but from where? (Tobi)
28 May-07:14:15 Re: calcite location (Tobi)
28 May-06:58:47 Re: calcite location (Vitomorim)
28 May-06:23:13 Re: cornish chalcocite but from where? (Jfc035)
28 May-06:20:32 Cornish chalcocite but from where? (Jfc035)
28 May-01:15:15 Re: collection of tobi (Philippe Durand)
28 May-00:46:50 Re: collection of tobi (Heimo Hellwig)
27 May-21:22:15 Re: calcite location (Joseph D'oliveira)

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Identify red mineral
  
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Marouenca




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PostPosted: May 02, 2017 16:58    Post subject: Identify red mineral  

Hi guys hope you can help me with this. There is no reaction with hcl


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Bob Carnein




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PostPosted: May 02, 2017 18:47    Post subject: Re: Identify red mineral  

Can you describe the hardness (harder or softer than your fingernail or glass/steel)? If it doesn't react to HCl, it might be gypsum (satin spar), which is very soft.
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Marouenca




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PostPosted: May 04, 2017 08:31    Post subject: Re: Identify red mineral  

Hardness test was 4
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Peter Megaw
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PostPosted: May 04, 2017 08:55    Post subject: Re: Identify red mineral  

what about heft? does it feel heavier/denser than a comparable size chunk of calcite or quartz...or even a regular rock?
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Marouenca




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PostPosted: May 04, 2017 09:16    Post subject: Re: Identify red mineral  

Yes its feel heavier and very hard
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Pete Richards
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PostPosted: May 04, 2017 10:41    Post subject: Re: Identify red mineral  

A very heavy mineral that looks like that and has a hardness of 4 could very well be barite or celestite. Suggest you look into flame tests; both barite and celestite will give distinctive colors to the flame.
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