Formula: (Zn,Mn)(Mn,Mg)12(Fe,Al)2(AsO3)(AsO4)2(OH)23
Origin of name: Named for Dr. Takaharu Araki (1929-), University of Chicago, for his numerous crystal-structure contributions to the science of mineralogy.
Crystal system: Monoclinic
Crystal class:
Twinning:
Unit cell: a = 14.248 Å, b = 8.228 Å, c = 24.23 Å, β = 93.62°
Colour: Reddish brown, orange brown
Diaphaneity: Opaque to translucent
Luster: Resinous - metallic
Habit: Micaceous - Platy texture with "flexible" plates., Aggregates - Made of numerous individual crystals or clusters., Anhedral Grains - Granular minerals without the expression of crysta l shapes
Hardness: 3-4
Specific gravity: 3.4 (calculated)
Cleavage: Perfect [001]
Tenacity: Brittle, uneven
Streak: Pale brown
Synonyms/varieties:
Comments:
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