پوولیت
Sign in to savePowellite is a calcium molybdate mineral with formula CaMoO4. Powellite crystallizes with tetragonal – dipyramidal crystal structure as transparent adamantine blue, greenish-brown, yellow-to-grey typically anhedral forms. It exhibits distinct cleavage, and has a brittle-to-conchoidal fracture. It has a Mohs hardness of 3.5 to 4 and a specific gravity of 4.25. It forms a solid solution series with scheelite (calcium tungstate, CaWO4). It has refractive index values of nω=1.974 and nε=1.984.
Key facts
- Mineral.name
- Powellite
- Mineral.category
- Molybdate minerals
- Mineral.image
- Powellite-288824.jpg
- Mineral.imagesize
- 260px
- Mineral.formula
- CaMoO4
- Mineral.IMAsymbol
- Pwl
- Mineral.molweight
- 200.02 g/mol
- Mineral.strunz
- 7.GA.05
- Mineral.system
- Tetragonal
- Mineral.class
- Dipyramidal (4/m) (same H-M symbol)
- Mineral.symmetry
- I41/a
- Mineral.unit cell
- a = 5.222 Å, c = 11.425 Å; Z = 4
- Mineral.color
- Straw-yellow, greenish yellow, yellow-brown, brown, colorless, may show blue to black zones
- Mineral.habit
- Flat tabular crystals often paper-thin on {001}, may be crusty to pulverulent or massive
- Mineral.cleavage
- Indistinct on {011}, {112} and {001}
- Mineral.fracture
- Conchoidal
- Mineral.mohs
- 3.5-4
- Mineral.luster
- Adamantine
via Wikipedia infobox
Wikidata facts
- Subclass of
- phosphate mineral
- Named after
- John Wesley Powell
- Image
- Powellite-23107.jpg
Show 8 more facts
- IMA Mineral Symbol
- Pwl
- Strunz 8th edition (series ID, updated)
- VI/F.01
- crystal system
- tetragonal crystal system
- Commons category
- Powellite
- chemical formula
- CaMoO₄
- Nickel-Strunz 9th edition (updated 2009)
- 7.GA.05
- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update)
- 7.GA.05
- described by source
- National Encyclopedia of Uzbekistan
Sources (1)
via Wikidata · CC0