Magnesio-axinite (Axinite-(Mg))

Big Photo

China
4.95 carats
© Giovanni Scapin 2015

Magnesio-axinite is a rare violet-coloured magnesium-dominant member of Axinite group.
General Information
A variety or type of:Axinite
Other Names/Trade Names:
Chemical Formula
Ca
 
2
MgAl
 
2
BSi
 
4
O
 
15
OH
Gemdat.org, Management Team (2012)
Physical Properties of Magnesio-axinite
Mohs Hardness6.5
Anthony et al, Handbook of Mineralogy (2001)
Specific Gravity3.178
Anthony et al, Handbook of Mineralogy (2001)
TenacityBrittle
Anthony et al, Handbook of Mineralogy (2001)
FractureUneven,Conchoidal
Anthony et al, Handbook of Mineralogy (2001)
Optical Properties of Magnesio-axinite
Refractive Index1.656 to 1.678
Anthony et al, Handbook of Mineralogy (2001)
Optical CharacterBiaxial/+,-
Anthony et al, Handbook of Mineralogy (2001)
Birefringence0.009 to 0.011
Gemdat.org, Management Team (2012)
PleochroismPale blue to pale violet and pale gray.
Anthony et al, Handbook of Mineralogy (2001)
DispersionStrong
Anthony et al, Handbook of Mineralogy (2001)
Colour
Colour (General)Pale blue to pale violet; light brown to light pink
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)Duller red
Anthony et al, Handbook of Mineralogy (2001)
Fluorescence (Long-Wave UV)Red-orange
Anthony et al, Handbook of Mineralogy (2001)
Crystallography of Magnesio-axinite
Crystal SystemTriclinic
Anthony et al, Handbook of Mineralogy (2001)
HabitAxe-head-shaped crystals to 3 cm.
Anthony et al, Handbook of Mineralogy (2001)
Geological Environment
Where found:Typically a mineral formed during contact metamorphism and boron metasomatism.
Anthony et al, Handbook of Mineralogy (2001)
Further Information
Mineral information:Magnesio-axinite information at mindat.org
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