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Dynamics involved in quartz forming hexagonal rings?
  
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Donn C.




Joined: 27 Jul 2014
Posts: 10
Location: Arizona

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PostPosted: Aug 14, 2022 13:29    Post subject: Dynamics involved in quartz forming hexagonal rings?  

Wondering about the crystal formation dynamics involved in Quartz crystals forming into this hexagonal ring formation??? Why do they form these rings in simple terms….. This piece has 7 rings in the group. I have found a few of these over the years.


qcf 1.jpg
 Mineral: Quartz
 Locality:
Santa Cruz County, Arizona, USA
 Dimensions: 30mm across group
 Description:
 Viewed:  1019 Time(s)

qcf 1.jpg



qcf 2.jpg
 Mineral: Quartz
 Locality:
Santa Cruz County, Arizona, USA
 Dimensions: 30mm across group
 Description:
 Viewed:  1021 Time(s)

qcf 2.jpg


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Eck Noch




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PostPosted: Aug 14, 2022 14:34    Post subject: Re: Dynamics involved in quartz forming hexagonal rings?  

It’s hard to tell, but I’m not seeing actual concentric rings of Quartz, I do see the outer ring of crystal growth but the inner growth seems more randomized. That being said, I have several pieces of self collected Quartz who’s growth was interrupted by calcite, it does have raised ridges of concentric lines, if this or something similar were the mechanism of growth, that I could absolutely see the Quartz growing that way! But what a cool piece. I’ll see if I can find the rocks In my yard to show this.
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Eck Noch




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PostPosted: Aug 14, 2022 15:12    Post subject: Re: Dynamics involved in quartz forming hexagonal rings?  

Here, found it. Calcite interrupted Quartz growth.


EC59F866-A264-4BA1-A571-54D13D3962A3.jpeg
 Mineral: Quartz
 Locality:
Placerville, Placerville District, El Dorado County, California, USA
 Description:
Calcite interrupted Quartz growth.
 Viewed:  991 Time(s)

EC59F866-A264-4BA1-A571-54D13D3962A3.jpeg


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Bob Morgan




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PostPosted: Aug 14, 2022 17:06    Post subject: Re: Dynamics involved in quartz forming hexagonal rings?  

Was this found in a small vugh or cavity or on a wall of a bigger space where mineralizing fluids might have flowed?
It appears that there were perhaps faster growth conditions with other places having crystals growing in all directions from a center. If so, these might be built by skeletal growth similar to crystals from Mule Creek, Grant County, New Mexico. They, in most extreme cases, have outer hexagonal walls with almost random growths in hollow insides.
Another possibility is that of dissolution of larger crystals more on the r and z terminal faces carving out the crystals and redeposition to finish off all the crystals as they now appear. That looks less likely to me in this case.
It is a wonderful find to spark mystery and research. Quartz sure can do that!
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Donn C.




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PostPosted: Aug 14, 2022 17:07    Post subject: Re: Dynamics involved in quartz forming hexagonal rings?  

Eck Noch wrote:
It’s hard to tell, but I’m not seeing actual concentric rings of Quartz, I do see the outer ring of crystal growth but the inner growth seems more randomized. That being said, I have several pieces of self collected Quartz who’s growth was interrupted by calcite, it does have raised ridges of concentric lines, if this or something similar were the mechanism of growth, that I could absolutely see the Quartz growing that way! But what a cool piece. I’ll see if I can find the rocks In my yard to show this.


I probably did not explain it well enough. The outside hexagon ring actually consists of 2 quartz crystals side by side or 12 crystals in the outside hexagon ring shape. The inside crystals are just random. Here is a photo of another one that I have but on this one the individual crystals continued to grow after forming the hexagon ring. I think you can see the individual crystals in this one.



DSCN1561.JPG
 Mineral: Quartz
 Locality:
Santa Cruz County, Arizona, USA
 Dimensions: 10mm across group
 Description:
 Viewed:  964 Time(s)

DSCN1561.JPG


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Eck Noch




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PostPosted: Aug 14, 2022 17:37    Post subject: Re: Dynamics involved in quartz forming hexagonal rings?  

Another angle of the same rock.


EACA7845-D542-4732-92E7-665C8165F504.jpeg
 Mineral: Quartz
 Locality:
Placerville, Placerville District, El Dorado County, California, USA
 Description:
 Viewed:  952 Time(s)

EACA7845-D542-4732-92E7-665C8165F504.jpeg


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Eck Noch




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PostPosted: Aug 14, 2022 17:40    Post subject: Re: Dynamics involved in quartz forming hexagonal rings?  

That’s really fascinating growth. Have me stumped for sure!
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