Stokesite

Formula: CaSnSi3O9.2H2O

Origin of name: for G. Stokes, British mathematician

 

Crystal system: orthorhombic

Crystal class: 2/m 2/m 2/m

Twinning:

Unit cell: 

 

Colour: colourless

Diaphaneity: 

Luster: vitreous, pearly on {100}

Habit: crystals pyramidal, large {010} faces

Hardness: 6

Specific gravity: 3.19

Cleavage: 2; {110} perfect, {010} poor

Tenacity: 

Streak: white

 

Synonyms/varieties:

 

Comments: 

 

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