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28 Mar-09:37:50 Re: 2 unknowns co-occurring with caledonite, grand reef mine, az (Cfrench58)
27 Mar-19:47:08 Re: 2 unknowns co-occurring with caledonite, grand reef mine, az (Pete Richards)
27 Mar-16:15:44 Re: 2 unknowns co-occurring with caledonite, grand reef mine, az (Cfrench58)
27 Mar-15:18:59 Re: 2 unknowns co-occurring with caledonite, grand reef mine, az (Alfredo)
27 Mar-14:39:29 2 unknowns co-occurring with caledonite, grand reef mine, az (Cfrench58)
27 Mar-05:21:48 Re: the mim museum in beirut, lebanon (Mim Museum)
27 Mar-05:03:26 Re: trying to find information on rose/pink quartz and tourmaline associations. (Ning)
27 Mar-02:39:50 Re: the mim museum in beirut, lebanon (Tobi)
27 Mar-00:23:28 Re: collection of volkmar stingl (Volkmar Stingl)
26 Mar-00:53:41 Re: collection of volkmar stingl (Volkmar Stingl)
25 Mar-13:32:10 Re: collection of michael shaw (Michael Shaw)
25 Mar-00:25:58 The mizunaka collection - quartz (Am Mizunaka)
23 Mar-13:35:22 Re: collection of firmo espinar (Firmo Espinar)
22 Mar-08:32:28 Re: collection of michael shaw (Michael Shaw)
22 Mar-04:20:41 Re: the mim museum in beirut, lebanon (Mim Museum)
21 Mar-22:49:19 Re: green seam. Looks like it in a state of decay. (Ning)
21 Mar-22:47:40 Re: green seam. Looks like it in a state of decay. (Ning)
21 Mar-22:45:25 Re: green seam. Looks like it in a state of decay. (Ning)
21 Mar-15:34:23 Re: the mizunaka collection - quartz (Am Mizunaka)
21 Mar-14:35:08 Re: jim’s mineral collection (Jim Wilkinson)
21 Mar-14:15:36 The 4th phoenix heritage mineral show (phms) hosted by mineralogical society of arizona (m (Chris Whitney-smith)
21 Mar-04:36:10 Re: the mizunaka collection (Tobi)
21 Mar-04:11:47 Re: jim’s mineral collection (James Catmur)
20 Mar-23:34:15 The mizunaka collection - quartz (Am Mizunaka)
20 Mar-18:13:16 Re: jim’s mineral collection (Jim Wilkinson)

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May I get a read
  
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jim hill




Joined: 03 Sep 2017
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Location: Bessemer, PA

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PostPosted: Dec 01, 2021 06:44    Post subject: May I get a read  

Specific gravity 3.39 to 3.50 hardness above 8
The black lines I believe come from separation of pieces.



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Bob Carnein




Joined: 22 Aug 2013
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Location: Florissant, CO


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PostPosted: Dec 01, 2021 10:19    Post subject: Re: May I get a read  

May I ask how you measured SG and hardness? It looks to me like quartz.
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Kevin Schofield




Joined: 05 Jan 2018
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PostPosted: Dec 01, 2021 10:59    Post subject: Re: May I get a read  

jim hill wrote:
Specific gravity 3.39 to 3.50 hardness above 8
The black lines I believe come from separation of pieces


Conchoidal fracture, vitreous luster on fracture planes...it's a chert/flint nodule. You have over-estimated the hardness.

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alfredo
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PostPosted: Dec 01, 2021 11:31    Post subject: Re: May I get a read  

I agree with Bob and Kevin. The density and hardness seem to be wrong. Looks like quartz.
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James Catmur
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Joined: 14 Sep 2006
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PostPosted: Dec 01, 2021 15:07    Post subject: Re: May I get a read  

I agree too
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