Powellite
A variety of Scheelite Group
What is Powellite?
Powellite is an unusual, molybdenum-containing mineral that appears in a variety of colors, though it is most commonly whitish or yellowish. The mineral was discovered in Idaho in the 1890s and was named for John Wesley Powell, a famed geologist and explorer who spent much time delving into the mineralogy and geology of the American west. Powellite is not used industrially or commercially, though some exceptionally-colored specimens may be sought after by collectors.
Etymology & Origins
Powellite was first described by William Harlow Melville in 1891 for an occurrence in the Peacock Mine, Adams County, Idaho and named for American explorer and geologist, John Wesley Powell (1834–1902).
Optical Properties
- Refractive Index
- 1.974-1.984
- Pleochroism
- Deeply colored specimens - Blue, green
- Optical Character
- Biaxial positive
Powellite Market Value Calculator
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Powellite Localities Map
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Health & Safety Information
- ⚠️Harm Reason: Powellite dust is toxic because it contains heavy metals Molybdenum.
- ⚠️Heavy Metal: Molybdenum
- ⚠️How to prevent the risks of Powellite?
Quick Facts
Physical Properties
- Color
- Yellow, straw-yellow, yellow-brown, brown, greenish yellow, grey, blue, black, colourless, black material is deep blue in transmitted light
- Hardness (Mohs)
- 3.5 - 4
- Density
- 4.255 g/cm³
- Streak
- Light yellow
- Luster
- Pearly, Resinous, Sub-adamantine
- Crystal System
- Tetragonal
Chemical Properties
- Chemical Formula
- Ca(MoO4)
- Elements
- Ca, Mo, O
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