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Acanthite on Chalcopyrite ps after Polybasite

#BN56939
SOLD
Acanthite from Guanajuato, Guanajuato, Mexico - BN56939
Acanthite from Guanajuato, Guanajuato, Mexico - BN56939

Acanthite on Chalcopyrite ps after Polybasite

#BN56939
Availability
Sold
Size
2.5 x 2 x 2 cm - Thumbnail 
Formula
Ag2S (RRUFF)
Locality
Guanajuato, Guanajuato, Mexico
Tagged
sulfide , silver

A fantastic specimen and classic from this locality. It is composed of tiny Chalcopyrite crystals which encrusted fairly good-sized Polybasite crystals to 5mm. You can make out the hexagonal outlines of the Polybasite. Sprinkled upon all of this are superb gray cubic Acanthite crystals to 4mm. The core as seen on the bottom is probably Pyrargyrite. It a very unique specimen. An example of one of these was featured on page 545 of Mineralogical Record v47 n5, Mexico VII.

Acanthite

Formula
Ag2S 
Crystal System
Monoclinic 
Crystal Habit
Blocky, Skeletal, Arborescent 
Cleavage
poor to none 
Luster
Metallic 
Color
lead gray, gray, iron black 
Streak
shining black 
Class
Monoclinic - Prismatic 
Fracture
Sectile 
Hardness
2-2.5 

Data courtesy of Webmineral.

Collection
Dr. Buford Nichols Collection
Mineralpedia
View Acanthite
On Dakota Matrix
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On Dakota Matrix
Other Available Acanthite
WebMineral
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Mindat
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