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04 May-16:39:42 Brochantite from milpillas mine, mexico / mvm (minerals - virtual museum) collection (Jordi Fabre)
03 May-23:23:09 Re: collection of volkmar stingl (Volkmar Stingl)
03 May-17:21:53 Re: martin danovski minerals collection (Jordi Fabre)
03 May-11:16:02 Re: ghost dendrite (Riccardo Modanesi)
03 May-05:51:59 Re: ghost dendrite (James Catmur)
03 May-04:17:02 Re: ghost dendrite (Marco Campos-venuti)
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02 May-17:55:30 Re: ghost dendrite (Matt_zukowski)
02 May-16:54:10 Re: the mizunaka collection - beryl (Am Mizunaka)
02 May-15:51:06 Wavellite from dug hill, usa / mvm (minerals - virtual museum) collection (Jordi Fabre)
02 May-12:39:56 Re: the mizunaka collection (Philippe Durand)
02 May-02:56:06 Re: the mizunaka collection (Volkmar Stingl)
02 May-02:23:53 Re: ghost dendrite (Roy Starkey)
02 May-02:20:14 Ghost dendrite (Marco Campos-venuti)
02 May-01:22:19 The mizunaka collection - beryl (Am Mizunaka)
01 May-14:15:03 Re: collection of volkmar stingl (Volkmar Stingl)
01 May-13:53:34 Re: collection of firmo espinar (Firmo Espinar)
01 May-09:04:18 Re: collection of michael shaw (Michael Shaw)
29 Apr-22:26:22 Re: collection of volkmar stingl (Volkmar Stingl)
29 Apr-17:56:49 The mizunaka collection - agate (Am Mizunaka)
29 Apr-16:45:46 Rutile from boiling springs, usa / mvm (minerals - virtual museum) collection (Jordi Fabre)
29 Apr-11:50:01 Re: libyan desert glass structure (Craig Hagstrom)
29 Apr-08:23:04 Re: collection of michael shaw (Michael Shaw)

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I need your help!
  
  Index -> FOR BEGINNERS: What is it? Where is it from?
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Von_von




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PostPosted: Jan 11, 2024 05:45    Post subject: I need your help!  
I got this mineral. I know it's quartz. I don't know what the fine yellow crystals could be. Could it be rhodochrosite? Thanks to everyone!

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Volkmar Stingl




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PostPosted: Jan 11, 2024 06:00    Post subject: Re: I need your help!  
I think this is Calcite, not Quartz (test the hardness)! The rhombohedrons could be Dolomite.

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Michael Shaw
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PostPosted: Jan 11, 2024 09:19    Post subject: Re: I need your help!  
I agree, this looks like calcite not quartz. A simple hardness test will differentiate between these two common minerals. Also, when submitting questions regarding identification, you should always tell us where the unknown mineral is from, if known. This is a great help in ID.
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James Catmur
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PostPosted: Jan 12, 2024 02:39    Post subject: Re: I need your help!  
It looks like Calcite to me too. This post explains how to do simple tests. For hardness if it will scratch glass it could be Quartz, but if glass scratches it then it is probably Calcite

https://www.mineral-forum.com/message-board/viewtopic.php?p=19487#19487

Michael Shaw wrote:
I agree, this looks like calcite not quartz. A simple hardness test will differentiate between these two common minerals. Also, when submitting questions regarding identification, you should always tell us where the unknown mineral is from, if known. This is a great help in ID.
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