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Crystal cluster??
  
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Jlea80




Joined: 19 Oct 2019
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PostPosted: Oct 21, 2019 22:52    Post subject: Crystal cluster??  

Hello, I need help identifying this type of quartz (I believe). I found it along a little creek in Polk County Arkansas (where I was born and raised). I’ve seen thousands of crystals but never a cluster such as this one.


45DD896D-2FFA-488B-99D4-7AD3E1357978.jpeg
 Mineral: Quartz
 Locality:
Mena, Polk County, Arkansas, USA
 Dimensions: Height 3-3.5, Width 3.5-3.75, circumference 10.5
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45DD896D-2FFA-488B-99D4-7AD3E1357978.jpeg


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Tobi




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PostPosted: Oct 22, 2019 00:36    Post subject: Re: Crystal cluster??  

Hello,

you should first read this before asking what some rock could be: https://www.mineral-forum.com/message-board/viewtopic.php?p=19487#19487

At least a hardness test would help a lot to confirm if it could be quartz or not ...

Regards
Tobi
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Bob Harman




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PostPosted: Oct 22, 2019 00:55    Post subject: Re: Crystal cluster??  

Arkansas is famous for its quartz crystals. Fresh examples mined in the quartz mines come in all sizes and range from water clear thru cloudy, opaque, to those with interesting inclusions. Large masses of fresh clear crystals are as common as individual crystals.

Do some testing as described, If quartz, it is a group of iron stained crystal bases with most of the crystal and their points broken off. Common from creek beds. BOB
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Jlea80




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PostPosted: Oct 22, 2019 01:09    Post subject: Re: Crystal cluster??  

Ok, I’ll do some testing! Thank you both!
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Jlea80




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PostPosted: Oct 22, 2019 23:54    Post subject: Re: Crystal cluster??  

I found 3 things to test the hardness, they are labeled in the picture. I also put vinegar on the rock and no bubbles, no reaction at all.


33F5E47D-8631-47B0-9140-FBC6147FA7FC.jpeg
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33F5E47D-8631-47B0-9140-FBC6147FA7FC.jpeg


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Tobi




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PostPosted: Oct 23, 2019 01:03    Post subject: Re: Crystal cluster??  

If it even scratches glass, it may really be quartz.
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Jlea80




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PostPosted: Oct 23, 2019 02:50    Post subject: Re: Crystal cluster??  

What else could it be? I’m only familiar with Quartz so I assumed that’s what it was. Although in this particular rock there are so many different shapes, colors, sizes, ect. Some pieces of it don’t even look like crystal (or quartz). Let me post a couple more pictures of it.


37D8BD91-AE25-479E-8F55-EB6A2D11448C.jpeg
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37D8BD91-AE25-479E-8F55-EB6A2D11448C.jpeg



CBA8CB80-7F39-419A-BD5B-CB95125B95C0.jpeg
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CBA8CB80-7F39-419A-BD5B-CB95125B95C0.jpeg


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Bob Harman




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PostPosted: Oct 23, 2019 04:59    Post subject: Re: Crystal cluster??  

I already told you that your example is the base of multiple badly broken quartz crystals. There are no intact crystals, only the bases of them remain. More now like a piece of massive quartz.
The example is also iron stained and dingy from being in the creek bed for a very long time. BOB
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Pete Richards
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PostPosted: Oct 23, 2019 09:08    Post subject: Re: Crystal cluster??  

I agree that this is quartz. I think it may be a conglomerate of quartz pebbles cemented together. These pebbles may be chunks of ordinary vein quartz, not pieces of individual well-shaped (euhedral) crystals. I do not think it is particularly special, though "special-ness" is determined by the collector.
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Collecting and studying crystals with interesting habits, twinning, and epitaxy
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Jlea80




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PostPosted: Oct 23, 2019 21:52    Post subject: Re: Crystal cluster??  

Thank you for that well worded answer. I understood you, and I agree.
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