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29 Feb-21:28:56 Re: don lum collection (Don Lum)
29 Feb-20:31:12 Re: trying to find information on rose/pink quartz and tourmaline associations. (Ning)
29 Feb-19:07:39 Re: trying to find information on rose/pink quartz and tourmaline associations. (Ning)
29 Feb-18:08:10 Cinnabar locality in transylvania (romania) (Cfrench58)
29 Feb-16:29:00 Re: trying to find information on rose/pink quartz and tourmaline associations. (Jordi Fabre)
29 Feb-12:27:04 Re: trying to find information on rose/pink quartz and tourmaline associations. (Lluis)
29 Feb-09:55:13 Re: trying to find information on rose/pink quartz and tourmaline associations. (Pete Richards)
29 Feb-08:34:25 Re: trying to find information on rose/pink quartz and tourmaline associations. (James Catmur)
29 Feb-04:06:12 Re: trying to find information on rose/pink quartz and tourmaline associations. (Ning)
29 Feb-03:21:28 Re: trying to find information on rose/pink quartz and tourmaline associations. (James Catmur)
29 Feb-02:13:00 Trying to find information on rose/pink quartz and tourmaline associations. (Ning)
28 Feb-10:58:31 Re: collection of carles millan (Carles Millan)
27 Feb-17:25:41 Re: collection of carles millan (Firmo Espinar)
27 Feb-08:43:18 Re: collection of volkmar stingl (Volkmar Stingl)
26 Feb-11:08:20 Re: collection of carles millan (Carles Millan)
26 Feb-09:32:24 Re: collection of carles millan (Michael Shaw)
26 Feb-06:51:22 National museum cardiff will no longer maintain expertise in mineralogy and petrology (James Catmur)
26 Feb-06:02:08 Re: collection of carles millan (Tobi)
26 Feb-05:39:22 Re: collection of carles millan (Enrique Llorens)
26 Feb-05:04:48 Re: collection of carles millan (Carles Millan)
26 Feb-03:18:46 Re: collection of carles millan (Tobi)
26 Feb-01:33:53 Re: collection of volkmar stingl (Volkmar Stingl)
26 Feb-00:09:00 Re: collection of carles millan (Am Mizunaka)
25 Feb-22:41:51 Re: collection of carles millan (Don Lum)
25 Feb-18:10:33 East coast gem, mineral and fossil show 2024! (Jordi Fabre)

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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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