Metaborite

Formula:  HBO2

Origin of name:  From Greek meta - after and boron

 

Crystal system:  Cubic

Crystal class:  -43m

Twinning: 

Unit cell: 

 

Colour:  Colourless to brownish

Diaphaneity: 

Luster:  Vitreous

Habit:  Aggregates to 1 cm, shows single faces of tetrahedron and trigonal tristetrahedron

Hardness:  5

Specific gravity:  2.47

Cleavage:  None

Tenacity: 

Streak: 

 

Synonyms/varieties:

 

Comments:  Slowly soluble in water

 

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