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28 Apr-16:41:04 Re: help with this new one (Bob Carnein)
28 Apr-16:27:48 Re: collection of fiebre verde - chivor (#621) (Fiebre Verde)
28 Apr-14:24:18 Re: cause of blue, green and blue/green coloration of cookeite (Don Lum)
28 Apr-13:30:37 Help with this new one (Marouenca)
28 Apr-08:36:13 Re: quartz and limonite from a sandstone quarry (Jamison Brizendine)
28 Apr-08:22:21 Re: collection of manuel mesa (Jamison Brizendine)
28 Apr-08:16:54 Cause of blue, green and blue/green coloration of cookeite (Daviddillman)
28 Apr-05:03:02 Re: collection of manuel mesa (Manuel Mesa)
27 Apr-17:47:53 Re: don lum collection (Don Lum)
27 Apr-16:10:08 The mizunaka collection - fluorapatite (Am Mizunaka)
27 Apr-11:19:53 Re: collection of manuel mesa (Manuel Mesa)
27 Apr-08:27:46 Re: quartz and limonite from a sandstone quarry (Pete Richards)
26 Apr-21:47:25 Re: quartz and limonite from a sandstone quarry (Dale Hallmark)
26 Apr-20:16:02 Re: the salt cathedral of zipaquira (Franjungle)
26 Apr-20:05:17 Re: collection of fiebre verde (Franjungle)
26 Apr-19:38:59 Re: don lum collection (Don Lum)
26 Apr-19:09:10 Re: quartz and limonite from a sandstone quarry (Texasdigger)
26 Apr-16:43:55 Quartz and limonite from a sandstone quarry (Pete Richards)
26 Apr-16:39:07 The mizunaka collection - fluorite with pyrite (Am Mizunaka)
26 Apr-11:50:41 Re: fluorite from whiteman creek, vernon, bc, canada (Bob Harman)
26 Apr-11:43:31 Re: collection of manuel mesa (Manuel Mesa)
26 Apr-09:27:15 Re: fluorite from whiteman creek, vernon, bc, canada (Tobi)
26 Apr-06:37:40 Re: collection of fiebre verde (Fiebre Verde)
26 Apr-05:59:51 Re: a mineralogical trip through germany / niedersachsen - lower saxony (Jordi Fabre)
26 Apr-02:26:26 Re: collection of heimo hellwig (Heimo Hellwig)

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Help identify from tunisia
  
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Marouenca




Joined: 22 Mar 2017
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Location: Tunisia

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PostPosted: Mar 22, 2017 09:03    Post subject: Help identify from tunisia  

Hi, I just found this and I'm new and don't know a lot. So guys can you help me to identify this mineral?


Screenshot_20170321-115503.jpg
 Locality:
Tunisia
 Dimensions: 4
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Screenshot_20170321-115503.jpg


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Bob Harman




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PostPosted: Mar 22, 2017 09:10    Post subject: Re: Help identify from tunisia  

Looks to me like a small broken piece of massive quartz with rusty iron staining. BOB
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John Betts




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PostPosted: Mar 22, 2017 09:30    Post subject: Re: Help identify from tunisia  

Please test for hardness. That will narrow down the possibilities.
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John S. White
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PostPosted: Mar 22, 2017 10:06    Post subject: Re: Help identify from tunisia  

I agree with Bob but it could be sulfur. If so it will be very soft and a piece of it will burn.
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Marouenca




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PostPosted: Mar 22, 2017 10:14    Post subject: Re: Help identify from tunisia  

It's hard and does not burn.
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John S. White
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PostPosted: Mar 22, 2017 10:22    Post subject: Re: Help identify from tunisia  

Quartz
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John S. White
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Vinoterapia




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PostPosted: Mar 22, 2017 10:22    Post subject: Re: Help identify from tunisia  

To my eyes it looks like calcite, you may try a hardness test, or just drop in a little of vinegar to find out if there is any reaction. If it is calcite you would see the (slow) formation of bubbles
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Marouenca




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PostPosted: Mar 23, 2017 04:21    Post subject: Re: Help identify from tunisia  

I put it in a little vinegar and i can see the slow formation of bubble
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