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Mineralpedia Details for Powellite

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Powellite

Powellite

Named for Major John Wesley Powell, the second Director at the United States Geological Survey, geologist, and explorer. This widespread but uncommon mineral forms as a secondary mineral in oxidized molybdenum-rich hydrothermal deposits and can also be found in basalt, tacite, and granite pegmatites. While most localities are considered minor, a few of the more prevalent ones include the United States, Mexico, Chile, Sweden, Scotland, India, and Namibia.

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

Formula
CaMoO4 
Crystal System
Tetragonal 
Crystal Habit
Crystalline - Coarse, Granular 
Cleavage
Distinct, None, None 
Luster
Adamantine - Resinous 
Color
blue, brown, green yellow, greenish blue, gray 
Streak
light yellow 
Class
Tetragonal - Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness
3.5 
WebMineral
View Powellite 
Mindat
View Powellite 

Powellite from Pandulane quarry, Nasik dist., India

Powellite
            from Pandulane quarry, Nasik dist., India

Tan, translucent crystal cluster to 2.3cm at the center of Apophyllite.

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Powellite from Inca de Oro, Atacama Region, Chile

Powellite
            from Inca de Oro, Atacama Region, Chile

Honey colored rather "large" micro crystals to 2mm.

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Powellite from Jardinera No.1 mine, Inca de Oro, Atacama, Chile

Powellite
            from Jardinera No.1 mine, Inca de Oro, Atacama, Chile

Excellent micro crystals to nearly 1mm lining a 5cm long cavity.

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Powellite from Tsumeb mine, Tsumeb, Namibia

Powellite
            from Tsumeb mine, Tsumeb, Namibia
Special Info
Raman

Orange, thin tabular crystals to about 1mm. The edges are tapering from a thicker center. The crystals have a circular outline which fits the crystal habit Powellite well. It was positively identified with Raman and matched very well. The Tetrahedrite crystals are fine and reach 7mm. This is a very good specimen with a lot of Powellite.

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Powellite from Nasik, India

Powellite
            from Nasik, India

Creamy tan pseudo-octahedral crystal.

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