Ferro-axinite (Axinite-(Fe))

Ferro-axinite is a clove-brown iron-rich member of Axinite group. Flawless crystals are rare, but they have rich colour and brilliance.

Ferro-axinite Gemstones by Size

This table shows distribution of Ferro-axinite gemstone sizes that are listed on this site. This can give a good indication as to the general availability of this gemstone in different sizes.
Contributed photos
Lightest:0.58 cts
Heaviest:1.22 cts
Average:0.81 cts
Total photos:4
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0.58ct to 0.64ct0.64ct to 0.71ct0.71ct to 0.77ct0.77ct to 0.84ct0.84ct to 0.90ct0.90ct to 0.96ct0.96ct to 1.03ct1.03ct to 1.09ct1.09ct to 1.16ct1.16ct to 1.22ct
General Information
A variety or type of:Axinite
Other Names/Trade Names:
Chemical Formula
Ca
 
2
Fe
2+
 
Al
 
2
BSi
 
4
O
 
15
OH
mindat.org (2012)
Photos of natural/un-cut material from mindat.org
Physical Properties of Ferro-axinite
Mohs Hardness6.5 to 7
Gemdat.org, Management Team (2012)
Specific Gravity3.25 to 3.28
Gemdat.org, Management Team (2012)
TenacityBrittle
Gemdat.org, Management Team (2012)
Cleavage QualityDistinct,Good
Gemdat.org, Management Team (2012)
FractureUneven,Irregular,Conchoidal
Gemdat.org, Management Team (2012)
Optical Properties of Ferro-axinite
Refractive Index1.674 to 1.693
Anthony et al, Handbook of Mineralogy (2001)
Optical CharacterBiaxial/-
Gemdat.org, Management Team (2012)
DispersionStrong
Gemdat.org, Management Team (2012)
Colour
Colour (General)Brown, clove-brown, plum blue, pearl gray
Gemdat.org, Management Team (2012)
TransparencyTransparent,Translucent
Gemdat.org, Management Team (2012)
LustreVitreous
Gemdat.org, Management Team (2012)
Crystallography of Ferro-axinite
Crystal SystemTriclinic
Gemdat.org, Management Team (2012)
HabitCrystals typically flattened, axe-head shaped, to 20 cm; granular, massive.
Anthony et al, Handbook of Mineralogy (2001)
Geological Environment
Where found:In low- to high-grade regionally metamorphosed rocks, in contact metamorphosed rocks, and in pegmatites.
Anthony et al, Handbook of Mineralogy (2001)
Further Information
Mineral information:Ferro-axinite information at mindat.org
Significant Gem Localities
France
 
  • Auvergne-Rhône-Alpes
    • Isère
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