Powellite

Formula: CaMoO4

Origin of name: for John Powell, American explorer

 

Crystal system: tetragonal

Crystal class: 4/m

Twinning: 

Unit cell: a = 5.2126 Å, c = 11.43 Å

 

Colour: straw-yellow, greenish yellow, brown, white to gray, greenish blue

Diaphaneity: 

Luster: subadamantine to greasy

Habit: crystals pyramidal, sometimes thin tabular, crystalline crusts, massive, foliated, pulverulent to ocherous

Hardness: 3.5 to 4

Specific gravity: 4.23

Cleavage: 3; {112}, {011} and {001} indistinct

Tenacity: 

Streak: 

 

Synonyms/varieties:

 

Comments: series with scheelite, fluoresces yellowish white to golden yellow

 

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