Powellite Value, Price, and Jewelry Information
An overview on Powellite Jewelry and Gems. Covers details and essential information on the physical properties and characteristics of Powellite gemstones.
By Joel E. Arem, Ph.D., FGA, updated on
Optics:o= 1.967-1.974; e = 1.978-1.985.
Uniaxial (+).
Occurrence: A secondary mineral in the oxidation zone of ore deposits.
Houghton County, Michigan: blue cuttable material.
Utah; Nevada; California; Arizona; New Mexico.
Pandulena Hill, Nasik, India: unique occurrence, scattered crystals associated with zeolite minerals in basalt cavities.
Turkey; Russia; Morocco.
Name: After the American explorer and geologist, John Wesley Powell.
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