Pentahydroborite

Formula: CaB2O(OH)6.2H2O

Origin of name: from composition, water and borate

 

Crystal system: triclinic

Crystal class: 1

Twinning: 

Unit cell: 

 

Colour: colourless

Diaphaneity: 

Luster: 

Habit: small grains

Hardness: 2.5

Specific gravity: 2.0

Cleavage: none

Tenacity: 

Streak: 

 

Synonyms/varieties:

 

Comments: fluoresces violet under SW ultraviolet light

 

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