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Nickeltalmessite?

Posted by Reiner Mielke  
Nickeltalmessite?
August 01, 2012 12:41AM
    
[www.mindat.org] There are three photos posted of this mineral all completely different looking. I am wondering if two of these aren't something else since they could be easily confused with nickelaustinite or even annabergite. Does anyone know which one is closest in appearance to the type specimen?
Re: Nickeltalmessite?
August 01, 2012 08:03AM
    
I believe this habit [www.mindat.org] is closest to the type-description:
"nickeltalmessite Ca2Ni(AsO4)2*2H2O has been found in association with annabergite, nickelaustinite, pecoraite, calcite and a mineral of the chromite-manganochromite series on a dump of the Ait Ahmane mine (Bou Azzer district, Marocco). The new mineral forms botryoidal aggregates consisting of split individuals up to 10 *10 * 20 mkm in size. Color is apple-green, streak white." ( [rruff.info] )

[www.mindat.org] this picture might actually show Ni-bearing Talmessite. It would be interesting to know if it has been analyzed.

Lefteris.
Re: Nickeltalmessite?
August 01, 2012 11:46PM
    
Thanks Lefteris, that was what I was thinking as well.
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