Mineral Information and Data:

Calderite
Mn2+3Fe3+2(SiO4)3 [CNMNC approved formula]

Named for James Calder, an early writer on the geology of India; name first applied to a rock, later transferred to its predominant mineral.

IMA status : Valid species (Pre-IMA 1909) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
51.04.03a.06  
  (51) Nesosilicate Insular SiO4 Groups Only
  (51.04) with cations in [6] and >[6] coordination
  (51.04.03a) Garnet group (Pyralspite series)
  
Nickel-Strunz
(10th edition) :
09.AD.2
  (09) Silicates
  (09.A) Nesosilicates (Isolated tetrahedron) structures
  (09.AD) Nesosilicates without additional anions; cations in [6] and/or greater coordination
  
Crystal system: Cubic System
Point group (H-M): m3m (or 4/m 3 2/m) — hexoctahedral
Space group: Ia3d
Unit cell: a = 11.81Å
Crystal Habit: Granular, massive.
  
Color: Dark reddish brown to dark yellowish; yellow to pale greenish yellow in thin section.
Diaphaneity: Semi-transparent
Hardness (Mohs): 7
Measured Density: 4.05 g/cm3
  
Geologic Setting: In a manganese deposit (Otjosondu, Namibia); in an iron formation (Wabush district, Canada).
Mineral Association: Pyrolusite, aegirine, rhodonite, hematite, rhodochrosite, quartz, kutnohorite (Wabush district, Canada).
  

 

Calderite
Dark red brown translucent crystalline calderite.
Origin: Hazaribag, Bihar, India.
Photo: Jeff Weissman

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