Powellite
Powellite is a calcium molybdate mineral with the formula CaMoO4. It was first discovered in 1914 and named after Arthur Powlett, 5th Duke of Cleveland, who had a keen interest in mineralogy.
Powellite has the following physical and chemical properties:
- Color: Yellow, yellow-green, grayish-green, grayish-white
- Crystal System: Tetragonal
- Crystal Habits: Crystals are square prisms, sometimes with a long columnar axis and a short square prism; also as granular and scaly masses
- Cleavage: Perfect on {001}
- Fracture: Conchoidal to uneven
- Hardness: 3.5-4.5 on Mohs scale
- Luster: Adamantine, greasy, waxy, dull
- Streak: White
- Specific Gravity: 4.3-4.5
- Transparency: Transparent to translucent
- Optical Properties: Uniaxial (-), may be anomalously biaxial due to strain
Powellite can be found in various localities worldwide, including the United States, Canada, Mexico, Italy, Germany, and China. For more information about Powellite
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