Formula: Ba(Mn,Mn)8O16
Origin of name: For T. Holland, British geologist
Crystal system: Monoclinic, pseudotetragonal
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Black, grayish black to silvery gray
Diaphaneity: Opaque
Luster: Metallic to dull
Habit: Crystals short prismatic; massive; fibrous; concretionary
Hardness: 6
Specific gravity: 4.95
Cleavage: 1; prismatic distinct
Tenacity:
Streak: Black
Synonyms/varieties:
Comments:
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