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Calumetite on Copper with Epidote

#PD45793

Calumetite on Copper with Epidote

#PD45793
Availability
Sold
Size
11 x 5 x 4 cm - Cabinet 
Formula
Cu(OH)2·2H2O (RRUFF)
Locality
Centennial mine, No. 2 shaft, Houghton Co., Michigan, United States
Tagged
copper

I like this specimen for its diversity but related mineral species. The main mineral, Calumetite, is the green or bluish green masses or crusts in an outer oxide zone formed with chlorine rich waters. It appears to encircle Epidote, but I think this is coincidental as the Calumetite is formed upon the native Copper. The Calumetite is a secondary mineral of the primary Copper and an oxychloride. The Epidote is a silicate formed in the Basalt to which the Copper, a native element occurred and formed from the melt alongside the Epidote. The Copper by the way shows several cubic faces in various places. Lastly, there is Calcite, a carbonate encrusting much of the specimen. I don't know where that one came from. 

It's an interesting piece from a famous and historic mine and mining region, which at one time supplied much of the country with Copper. Comes with an older label from the "Camden Mineral Company”.

I like this specimen for its diversity but related mineral species. The main mineral, Calumetite, is the green or bluish green masses or crusts in an outer oxide zone formed with chlorine rich waters. It appears to encircle Epidote, but I think this is coincidental as the Calumetite is formed upon the native Copper. The Calumetite is a secondary mineral of the primary Copper and an oxychloride. The Epidote is a silicate formed in the Basalt to which the Copper, a native element occurred and formed from the melt alongside the Epidote. The Copper by the way shows several cubic faces in various places. Lastly, there is Calcite, a carbonate encrusting much of the specimen. I don't know where that one came from. 

It's an interesting piece from a famous and historic mine and mining region, which at one time supplied much of the country with Copper. Comes with an older label from the "Camden Mineral Company”.

Calumetite

Formula
Cu(OH)2·2H2
Crystal System
Orthorhombic 
Crystal Habit
Spherical, Wheat Sheaf, Scaly 
Cleavage
Perfect, None, None 
Luster
Pearly 
Color
azure blue, powder blue, bluish white 
Streak
blue 
Class
Orthorhombic 
Fracture
Brittle 
Hardness

Data courtesy of Webmineral.

Collection
Phillips Collection

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