Formula: (Mn,Ca)3(Fe,Al)2(SiO4)3
Origin of name: For James Calder, early writer about Indian geology
Crystal class: 4/m -3 2/m
Colour: Dark yellow, dark reddish-brown
Diaphaneity: Semi-transparent
Hardness: 7
Specific gravity: 4.08
Cleavage: None
Synonyms/varieties:
Comments:
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