Mineralpedia Details for 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
- Crystal System
- Crystal Habit
- Crystalline - Coarse, Granular
- Distinct, None, None
- Adamantine - Resinous
- blue, brown, green yellow, greenish blue, gray
- light yellow
- Tetragonal - Dipyramidal
- Brittle - Conchoidal
- View Powellite
- View Powellite
Powellite from Pandulane quarry, Nasik dist., India
Tan, translucent crystal cluster to 2.3cm at the center of Apophyllite.
Powellite from Inca de Oro, Atacama Region, Chile
Honey colored rather "large" micro crystals to 2mm.
Powellite from Jardinera No.1 mine, Inca de Oro, Atacama, Chile
Excellent micro crystals to nearly 1mm lining a 5cm long cavity.
Powellite from Tsumeb mine, Tsumeb, Namibia
- Special Info
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.
Powellite from Nasik, India
Creamy tan pseudo-octahedral crystal.