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Mineralpedia Details for Calumetite

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Calumetite

Calumetite

Named after the town of Calumet in Michigan, USA which is nearby the locality where the mineral was first discovered and is also near the type locality for the mineral at the Centennial mine. Calumetite is a rare mineral with additional localities in Greece, Germany, Italy, and Austria. It occurs at the type locality “in cavities and fractures in basalt, formed by the action of chlorine-bearing connate waters on copper, [with] cuprite being regarded as an intermediate product in the alteration.” Associated minerals include tremolite, quartz, epidote, copper, cuprite, atacamite, buttgenbachite, malachite, paratacamite, and anthonyite.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/calumetite.pdf

Formula
Cu(OH)2ยท2H2
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
WebMineral
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Calumetite from Centennial mine, Houghton Co., Michigan, United States

Calumetite
            from Centennial mine, Houghton Co., Michigan, United States

Fine deep to light green scales on Copper.

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