Pinnoite

Formula: MgB2O4.3H2O

Origin of name: for Mr. Pinno, German mining official

 

Crystal system: tetragonal

Crystal class: 4

Twinning: 

Unit cell: 

 

Colour: yellow, yellowish green

Diaphaneity: translucent

Luster: vitreous

Habit: crystals short prismatic, elongated parallel to c-axis, rare, massive crystalline or fine granular radial fibrous nodular

Hardness: 3.5

Specific gravity: 2.29

Cleavage: none

Tenacity: 

Streak: 

 

Synonyms/varieties:

 

Comments: 

 

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