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19 Jan-19:59:52 Re: don lum collection (Don Lum)
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18 Jan-18:36:38 The mizunaka collection - smoky quartz (Am Mizunaka)
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17 Jan-22:53:41 Re: silvia's collection (Silvia)
17 Jan-22:42:23 The mizunaka collection - quartz (Am Mizunaka)
17 Jan-12:30:52 Re: collection of ras (Robert Seitz)
17 Jan-05:34:24 Re: collection of firmo espinar (Tobi)
17 Jan-04:08:41 Re: collection of sante celiberti (Tobi)
17 Jan-04:02:37 Re: silvia's collection (Tobi)
17 Jan-03:52:12 Re: tucson shows 2022 (Tobi)
16 Jan-08:33:31 Re: apophyllite from brazil - a new find from 2021? (Gagat Minerals)
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15 Jan-22:29:08 Re: tucson shows 2022 - it's starting!! (Bob Harman)
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




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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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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




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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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PostPosted: Dec 01, 2021 15:07    Post subject: Re: May I get a read  
I agree too
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