Silhydrite

Formula: 3SiO2.H2O

Origin of name: from composition

 

Crystal system: orthorhombic

Crystal class: unknown

Twinning:

Unit cell: 

 

Colour: white

Diaphaneity: 

Luster: 

Habit: crystals smaller than 4 micron, crystalline masses, punky, light, porous

Hardness: about 1

Specific gravity: 2.141

Cleavage: none

Tenacity: 

Streak: 

 

Synonyms/varieties:

 

Comments: 

 

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