Magnussonite

Formula: Mn5As3O9(OH,Cl)

Origin of name:  For Nils Magnusson, Swedish official

 

Crystal system:  Cubic

Crystal class:  4/m -3 2/m

Twinning: 

Unit cell: 

 

Colour:  Grass-green to emerald-green, blue-green

Diaphaneity: 

Luster:  Vitreous

Habit:  Incrustations, fine-grained

Hardness:  3.5 to 4

Specific gravity:  4.30

Cleavage:  None

Tenacity: 

Streak:  White

 

Synonyms/varieties:

 

Comments: 

 

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