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Autor Thema: Help identify  (Gelesen 2670 mal)

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Offline jennifercindrich

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Help identify
« am: 17 Nov 19, 18:48 »
I am sending this off for testing but until then I thought it would be fun to hear some of your best guesses on this one.
The location is Packsaddle Mountain, Llano Uplift in central Texas.
This specimen is on a green schist(make-up of the schist includes-albite, tourmaline, tremolite,calcite, quartz).
Very nearby(within a few cm) dravite(with Ti), garnet, epidot,k-feldspar,mica.
This deposit sits below an iron cap to include closeby- goethite, jarosite, galena, many Mn...

The specimen-
hardness and streak-too small to test
dissolves readily in HCI(no bubbles)
orthorhombic
does not dissolve in water

the FOV is 2mm
ans the second is FOV .5

Online smaragd123

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Re: Help identify
« Antwort #1 am: 17 Nov 19, 20:22 »
Cerussite?

Is this a mystery or a determination?
« Letzte Änderung: 17 Nov 19, 20:44 von smaragd123 »

Offline jennifercindrich

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Re: Help identify
« Antwort #2 am: 17 Nov 19, 20:56 »
I do not know what it is but would like to know.
« Letzte Änderung: 17 Nov 19, 21:17 von jennifercindrich »

Offline Lynx

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Re: Help identify
« Antwort #3 am: 17 Nov 19, 21:10 »
Hi Jennifer

your mindat-guess austinite looks close. Though, this would need arsenic and zinc to be present at that location. Are they?
You might check for fluorescence.
Personally I would vote for cerussite...

Cheers!
Martin

Offline jennifercindrich

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Re: Help identify
« Antwort #4 am: 17 Nov 19, 21:20 »
Hi Martin,

I am just determining what this site has so the As and Zn are unknown as of yet.
It does not fluoresce.

Offline Lynx

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Re: Help identify
« Antwort #5 am: 17 Nov 19, 22:52 »
Hi Jennifer

ok, so austinite is still a possibility.

Cheers!

Offline jennifercindrich

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Re: Help identify
« Antwort #6 am: 18 Nov 19, 01:17 »
Yes I am hopeful of that possibility. A water well not far has much As in it.

Offline alfredo

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Re: Help identify
« Antwort #7 am: 18 Nov 19, 03:24 »
 :o  ...And do people drink that water?

Offline jennifercindrich

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Re: Help identify
« Antwort #8 am: 18 Nov 19, 03:53 »
No

Offline alfredo

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Re: Help identify
« Antwort #9 am: 18 Nov 19, 04:55 »
Bangladesh has a serious problem with widespread arsenic in the drinking water. They found that the simplest solution is to filter it through powdered limonite, which absorbs the As and turns it into insoluble scorodite.

 

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