Phyllotungstite

Formula: CaFe3H(WO4)6.10H2O

Origin of name: from Greek for leaf and from tungsten

 

Crystal system: orthorhombic

Crystal class: 222

Twinning: 

Unit cell: 

 

Colour: yellow

Diaphaneity: translucent

Luster: pearly

Habit: crystals tabular, to 0.25 mm, scaly, radial aggregates, crusts

Hardness: about 2

Specific gravity: 5.26

Cleavage: 1; {001} perfect

Tenacity: 

Streak: yellowish

 

Synonyms/varieties:

 

Comments: 

 

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