Formula: (Mn,Mg)6Zn3(AsO4)2(SiO4)(OH)8
Origin of name: For A. Holden, mining engineer
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: Pink to yellowish red, deep red
Diaphaneity: Translucent
Luster: Vitreous
Habit: Crystals thick tabular to equant
Hardness: 4
Specific gravity: 4.11
Cleavage: 1; {010} poor
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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