Mohawkite
Image: Alchemist-hp (talk) (www.pse-mendelejew.de) (GFDL 1.2)
Mineral NameMohawkite
Chemical FormulaCu3As up to Cu6As
Mohs Hardness3
Crystal Systemamorphous
Lustermetallic
Streak Colorblack
Cleavagenone
Fractureuneven
Specific Gravity7.5
Colorsmetallic bronze, copper-brown, dark gray
Transparencyopaque
Type LocalityMohawk Mine, Houghton, Keweenaw, Michigan, USA
Mineral GroupArsenides
Usescollector, minor ore of copper
Associated Mineralsdomeykite, algodonite, native copper
Rarityuncommon
Description
A dark, metallic, irregularly shaped nugget with a rough, textured surface and some smoother, reflective areas. Its color is a tarnished bronze to dark gray, with hints of reddish-brown.
Geological Context
Mohawkite forms in hydrothermal veins, typically associated with native copper deposits found within basaltic lavas, characteristic of the Keweenaw Peninsula's geological setting.
