Calderite

Formula:  (Mn,Ca)3(Fe,Al)2(SiO4)3

Origin of name:  For James Calder, early writer about Indian geology

 

Crystal system:  Cubic

Crystal class:  4/m -3 2/m

Twinning:

Unit cell:

 

Colour:  Dark yellow, dark reddish-brown

Diaphaneity:  Semi-transparent

Luster:

Habit:

Hardness:  7

Specific gravity:  4.08

Cleavage:  None

Tenacity:

Streak:

 

Synonyms/varieties:

 

Comments:

 

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