Allargentum : (Ag1-xSbx), Silver (Var: Antimonian Silver) : (Ag,Sb), Safflorite : (Co,Ni,Fe)As2, Skutterudite : CoAs3, Nickeline : NiAs

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Copyright © Maggie Wilson
minID: T17-4H8

Allargentum : (Ag1-xSbx), Silver (Var: Antimonian Silver) : (Ag,Sb), Safflorite : (Co,Ni,Fe)As2, Skutterudite : CoAs3, Nickeline : NiAs

Copyright © Maggie Wilson  - This image is copyrighted. Unauthorized reproduction prohibited.
Dimensions: 9.5 cm x 6.5 cm x 5 cm

9.5 x 6.5 x 5.0 cm

This specimen was etched out of dolomite to reveal an unusual complete undamaged formation of Allargentum which appears as a ribbed "vein" 4cm long and 0.6cm at its widest point . This formation consists of a graphic intergrowth of Allargentum and Antimony rich Silver ("Silver 2") as can be seen in another photo of an etched polished surface of a similar sample. In that photo the Allargentum is the dark lamellae and the matrix is the Antimony rich Silver (7-8%Sb).
It is interpreted that this "represents exsolutions from an original Allargentum that contained more silver than the present Allargentum. Somanchi&Clark (1996) found that a complex intergrowth of Silver2 and Allargentum, such as this…forms a homogeneous phase by annealing. They, therefore, suggested that the Silver2-Allargentum intergrowths were formed by deposition of a homogeneous solid solution which subsequently exsolved into antimonial silver (Silver2) and Allargentim on cooling." ( Petruk,Harris,Cabri and Stewart; Can Min.V11, Part 1, 1971 p187-195).
This Allargentum is associated with ordinary leaf silver all of which are on botryoidal Ni-Co arsenides ( Nickeline, Rammelsbergite, Cobaltite, Skutterudite etc.) The botryoids are covered in micro size ( < 1mm) Safflorite and Skutterudite crystals. All the Allargentum from Cobalt ( the type locality) occurs as graphic intergrowths but as far as I know this is the first time such formations have been found. It was collected by Reiner Mielke in 2003.

This Photo was Mindat.org Photo of the Day - 14th Jul 2009

This photo has been shown 1891 times
Photo added:8th Feb 2009
Dimensions:2095x1571px (3.29 megapixels)
Date/Time of Photo:7th Feb 2009 20:51:54
Camera:CANON PowerShot S3 IS
Exposure time:1/125s
Focal Length:6mm

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