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Mineralien / Minerals / Minerales => Mineralien (Fundort) bestimmen / determine minerals => Thema gestartet von: jennifercindrich am 17 Nov 19, 18:48

Titel: Help identify
Beitrag von: jennifercindrich 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
Titel: Re: Help identify
Beitrag von: smaragd123 am 17 Nov 19, 20:22
Cerussite?

Is this a mystery or a determination?
Titel: Re: Help identify
Beitrag von: jennifercindrich am 17 Nov 19, 20:56
I do not know what it is but would like to know.
Titel: Re: Help identify
Beitrag von: Lynx 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
Titel: Re: Help identify
Beitrag von: jennifercindrich 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.
Titel: Re: Help identify
Beitrag von: Lynx am 17 Nov 19, 22:52
Hi Jennifer

ok, so austinite is still a possibility.

Cheers!
Titel: Re: Help identify
Beitrag von: jennifercindrich am 18 Nov 19, 01:17
Yes I am hopeful of that possibility. A water well not far has much As in it.
Titel: Re: Help identify
Beitrag von: alfredo am 18 Nov 19, 03:24
 :o  ...And do people drink that water?
Titel: Re: Help identify
Beitrag von: jennifercindrich am 18 Nov 19, 03:53
No
Titel: Re: Help identify
Beitrag von: alfredo 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.