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Chalcocite

#65777
SOLD
Chalcocite from Magma mine, Pinal Co., Arizona, United States - 65777
Chalcocite from Magma mine, Pinal Co., Arizona, United States - 65777

Chalcocite

#65777
Availability
Sold
Size
15 x 9 x 6.5 cm - Cabinet 
Formula
Cu2S (RRUFF)
Locality
Magma mine, Pinal Co., Arizona, United States
Tagged
ore mineral , sulfide , copper

Another famous copper deposit in the Arizona southwest is the Magma mine, which began mining in 1910. It eventually closed in 1981 partially due to falling copper prices. The copper deposit mined hydrothermal replacements of limestone strata and as vein deposits produced by faulting.

This specimen is from the old underground workings and collected by Dr. David London, who carried it and loaded pack on a ladder 200 feet below the surface.

Today the Magma mine is currently under investigation by Resolution Copper (RCM) (https://resolutioncopper.com/project-overview ) . RCM is partnered with BHP and Rio Tinto and is said to be the largest copper deposit in the world and has reserves of up to 40 Billion pounds of copper in porphyry which underlies all the old workings at 5,000 to 7000 feet underground.

Chalcocite

Formula
Cu2S 
Crystal System
Monoclinic 
Crystal Habit
Massive, Granular, Euhedral Crystals 
Cleavage
Indistinct, None, None 
Luster
Metallic 
Color
blue black, gray, black, black gray, steel gray 
Streak
grayish black 
Class
Monoclinic - Prismatic 
Fracture
Conchoidal 
Hardness
2.5-3 

Data courtesy of Webmineral.

Collection
Dr. David London Collection
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