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17 Jan-22:42:23 The mizunaka collection - quartz (Am Mizunaka)
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17 Jan-03:52:12 Re: tucson shows 2022 (Tobi)
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15 Jan-22:23:43 Re: apophyllite from brazil - a new find from 2021? (Alfredo)

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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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