Sarkinite

Formula: Mn(AsO4)(OH)

Origin of name: from Greek for made of flesh

 

Crystal system: monoclinic

Crystal class: 2/m

Twinning:

Unit cell: a = 12.68 Å, b = 13.54 Å, c = 10.17 Å, b = 108.7°

 

Colour: dark red to reddish yellow to yellow

Diaphaneity: 

Luster: greasy

Habit: crystals thick tabular, slightly elongated, or prismatic, granular, spherical

Hardness: 4 to 5

Specific gravity: 4.08 to 4.18

Cleavage: 1; {100} distinct

Tenacity: 

Streak: red to yellow

 

Synonyms/varieties:

 

Comments: 

 

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