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Quartz Points locality
  
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R Saunders




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PostPosted: Mar 08, 2021 06:55    Post subject: Quartz Points locality  

Purchased item with no information. Quartz points with unknown brown matrix type. Would like possible locality and more.


20210307_121444_HDR.jpg
 Mineral: quartz
 Dimensions: 8.5 cm x 5.1 cm
 Description:
 Viewed:  923 Time(s)

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20210307_121550_HDR.jpg
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20210307_121637_HDR.jpg
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20210307_121504_HDR.jpg
 Description:
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James Catmur
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PostPosted: Mar 08, 2021 07:26    Post subject: Re: Quartz Points locality  

No idea about the locality. Could be Siderite?
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Chris Rayburn




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PostPosted: Mar 08, 2021 07:30    Post subject: Re: Quartz Points locality  

I'm having trouble seeing the crystallography, but this is a dead ringer for baryte from the Book Cliffs area, Mesa County, Colorado. The baryte often forms slender prisms like these. If you look down the length of the crystal, baryte will be four sided, quartz six sided in nearly all cases.
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R Saunders




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PostPosted: Mar 08, 2021 07:50    Post subject: Re: Quartz Points locality  

Chris Rayburn wrote:
I'm having trouble seeing the crystallography, but this is a dead ringer for baryte from the Book Cliffs area, Mesa County, Colorado. The baryte often forms slender prisms like these. If you look down the length of the crystal, baryte will be four sided, quartz six sided in nearly all cases.


Thanks, just checked with a loupe, I see multiple six (6) pointed. I may set up my microscope for pictures later. These are with a cell phone.
Bob
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Chris Rayburn




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PostPosted: Mar 08, 2021 08:20    Post subject: Re: Quartz Points locality  

And with a second look, the matrix doesn't look quite right for Book Cliffs, especially in the third photo. James is right, the reddish brown crystals (if they are crystals) look like siderite.
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Amir Akhavan




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PostPosted: Mar 08, 2021 10:29    Post subject: Re: Quartz Points locality  

Where did you buy it?

It looks a bit like an alpine-type fissure specimen, because the cavity has opened perpendicular to the bedding of the host rock.

It reminds me of specimens from Vizille and Belledonne.
https://www.mindat.org/loc-191228.html

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Amir C. Akhavan, Hamburg, Germany
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R Saunders




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PostPosted: Mar 08, 2021 10:35    Post subject: Re: Quartz Points locality  

more pictures. image #6 shows a flat blade at 3 on the right. Looks like sand stone matrix where as I think of siderite as a very hard subtance.


20210308_101612.jpg
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20210308_101555.jpg
 Description:
 Viewed:  783 Time(s)

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20210308_101456.jpg
 Description:
 Viewed:  783 Time(s)

20210308_101456.jpg



20210308_101232.jpg
 Description:
 Viewed:  783 Time(s)

20210308_101232.jpg



20210308_101120.jpg
 Description:
 Viewed:  782 Time(s)

20210308_101120.jpg



20210308_101027.jpg
 Description:
 Viewed:  783 Time(s)

20210308_101027.jpg


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Sante Celiberti




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PostPosted: Mar 08, 2021 11:40    Post subject: Re: Quartz Points locality  

Amir Akhavan wrote:
...It reminds me of specimens from Vizille and Belledonne...

I agree.
Allevard and Mésage (in the same Alpine area) could also be two possible candidates.
Any traces of pyrite would strengthen the Mésage hypothesis.
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Bob Morgan




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PostPosted: Mar 08, 2021 12:20    Post subject: Re: Quartz Points locality  

If the brown mineral is ankerite then the Jeffrey Quarry in Arkansas is a possible location
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Tobi




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PostPosted: Mar 09, 2021 03:03    Post subject: Re: Quartz Points locality  

Sante Celiberti wrote:
Amir Akhavan wrote:
...It reminds me of specimens from Vizille and Belledonne...
I agree.
Allevard and Mésage (in the same Alpine area) could also be two possible candidates.
Any traces of pyrite would strengthen the Mésage hypothesis.
I thought the same, looks French and reminds me of Allevard or surrounding area. No guarantee for sure, but it looks really distinctive ...
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R Saunders




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PostPosted: Mar 09, 2021 04:48    Post subject: Re: Quartz Points locality  

I tried a U V 365 Nano flashlight and no change.
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