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Argentopyrite with Pyrargyrite

#PD30966

Argentopyrite with Pyrargyrite

#PD30966
Availability
Sold
Size
5 x 3.5 x 2.5 cm - Miniature 
Formula
AgFe2S3 (RRUFF)
Locality
St. Andreasberg dist., Harz, Lower Saxony, Germany
Tagged
sulfide

Originally labeled as Sternbergite and but confirmed visually as the dimorph Argentopyrite by Mark Feinglos. It is his favorite mineral and he was astonished by the the number of Argentpyrite crystals on this specimen.

The specimen is mostly Pyrargyrite but is full of micro 1mm and less bronze to metallic gray Argentopyrite crystals. The photos do not do it justice. The crystals are orthorhombic twinned pseudohexagonal prisms with prominent re-entry angles appearing as deep striations. It's the same twinning involved in the Aragonite crystals also in this update.

Argentopyrite

Formula
AgFe2S3 
Crystal System
Orthorhombic 
Cleavage
None, None, None 
Luster
Metallic 
Color
blue, bronze brown, green, yellow, white 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle - Uneven 
Hardness
3.5-4 

Data courtesy of Webmineral.

Collection
Phillips Collection

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