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27 Apr-11:25:36 Re: collection of volkmar stingl (Volkmar Stingl)
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26 Apr-10:41:00 Re: collection of joseph d'oliveira (Joseph Doliveira)
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26 Apr-10:10:30 Re: collection of antonio nazario (Antonio Nazario)
26 Apr-09:24:46 Re: collection of antonio nazario (Jordi Fabre)
26 Apr-07:54:41 Re: collection of joseph d'oliveira (Joseph Doliveira)
26 Apr-03:35:03 Re: collection of antonio nazario (James Catmur)
26 Apr-03:19:37 Re: collection of tobi (Tobi)
26 Apr-02:52:29 Re: collection of antonio nazario (Tobi)
26 Apr-02:36:06 Re: collection of joseph d'oliveira (Jordi Fabre)
26 Apr-01:07:58 The mizunaka collection - rhodochrosite (Am Mizunaka)
25 Apr-22:13:47 Re: collection of antonio nazario (Antonio Nazario)
25 Apr-22:02:52 Re: collection of antonio nazario (Antonio Nazario)
25 Apr-21:44:30 Collection of antonio nazario (Antonio Nazario)
25 Apr-19:17:26 Re: collection of joseph d'oliveira (Joseph Doliveira)
24 Apr-05:09:17 Re: need help with identification of minerals in an old video (James Catmur)
24 Apr-04:24:30 Re: collection of tobi (Carles Millan)
23 Apr-17:44:56 Re: in memoriam - george robinson, a man of science, passed away (Peter Megaw)
23 Apr-09:12:26 Re: collection of michael shaw (Michael Shaw)
23 Apr-08:42:40 Need help with identification of minerals in an old video (Hababkhan)
23 Apr-08:12:31 Re: collection of michael shaw (Tobi)
23 Apr-07:31:29 Re: collection of michael shaw (Michael Shaw)
23 Apr-03:24:05 The mizunaka collection - quartz (Am Mizunaka)
22 Apr-07:43:53 Re: the mim museum in beirut, lebanon (Mim Museum)

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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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