Manganaxinite (Axinite-(Mn))

Manganaxinite is yellow-orange, manganese-rich member of Axinite group.
General Information
A variety or type of:Axinite
Other Names/Trade Names:
Chemical Formula
Ca
 
2
Mn
2+
 
Al
 
2
BSi
 
4
O
 
15
(OH)
Gemdat.org, Management Team (2012)
Photos of natural/un-cut material from mindat.org
Physical Properties of Manganaxinite
Mohs Hardness6.5 to 7
Anthony et al, Handbook of Mineralogy (2001)
Specific Gravity3.314
Anthony et al, Handbook of Mineralogy (2001)
TenacityBrittle
Anthony et al, Handbook of Mineralogy (2001)
Cleavage QualityGood
Anthony et al, Handbook of Mineralogy (2001)
FractureUneven,Conchoidal
Anthony et al, Handbook of Mineralogy (2001)
Optical Properties of Manganaxinite
Refractive Index1.678 to 1.692
Anthony et al, Handbook of Mineralogy (2001)
Optical CharacterBiaxial/-
Anthony et al, Handbook of Mineralogy (2001)
Colour
Colour (General)Honey-yellow, clove-brown, brown, blue; colorless to pale brown or blue in thin section.
Anthony et al, Handbook of Mineralogy (2001)
TransparencyTransparent,Translucent
Anthony et al, Handbook of Mineralogy (2001)
LustreVitreous
Anthony et al, Handbook of Mineralogy (2001)
Fluorescence & other light emissions
Fluorescence (Short Wave UV)Magenta-red
Anthony et al, Handbook of Mineralogy (2001)
Crystallography of Manganaxinite
Crystal SystemTriclinic
Anthony et al, Handbook of Mineralogy (2001)
HabitCrystals typically flattened, axe-head shaped, to 10 cm; granular, massive.
Anthony et al, Handbook of Mineralogy (2001)
Geological Environment
Where found:Typically a mineral formed by contact metamorphism and boron metasomatism; from a pegmatite vein cutting metamorphosed iron formation at a contact with gabbro (Minnesota, USA).
Anthony et al, Handbook of Mineralogy (2001)
Further Information
Mineral information:Manganaxinite information at mindat.org
Significant Gem Localities
France
 
  • Auvergne-Rhône-Alpes
    • Isère
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