Axinite

Big Photo

Baja California, Mexico
3.14 carats
© Rarestone.com

Axinite (Greek - axe) was named because of its sharp-edged crystals, which can be considered a positive identification feature.

Large clean axinite specimens are rare. Most crystals have some inclusions, usually in the form of delicate veils.

Marked variations in hardness have been reported.

Axinite Gemstones by Colour

This table shows the variety of hues this gemstone can be found in. Click on a photo for more information.
 

Axinite Gemstones by Size

This table shows distribution of 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:0.18 cts
Heaviest:6.97 cts
Average:2.60 cts
Total photos:15
Do you have a larger Axinite? Why not upload a photo?
0.18ct to 0.86ct0.86ct to 1.54ct1.54ct to 2.22ct2.22ct to 2.90ct2.90ct to 3.58ct3.58ct to 4.25ct4.25ct to 4.93ct4.93ct to 5.61ct5.61ct to 6.29ct6.29ct to 6.97ct
General Information
Varieties/Types:
Ferro-axinite - Iron-dominant Axinite mineral.
Magnesio-axinite - Magnesium-dominant member of Axinite group.
Manganaxinite - Manganese-dominant member of Axinite group.
Chemical Formula
(Ca,Fe,Mn,Mg)
 
3
Al
 
2
BSi
 
4
O
 
15
(OH)
Walter Schumann, Gemstones of the world (2001)
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Physical Properties of Axinite
Mohs Hardness6.5 to 7
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Specific Gravity3.26 to 3.36
Walter Schumann, Gemstones of the world (2001)
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TenacityBrittle
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Cleavage QualityGood
Walter Schumann, Gemstones of the world (2001)
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FractureConchoidal
Arthur Thomas, Gemstones (2009)
Optical Properties of Axinite
Refractive Index1.656 to 1.704
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Optical CharacterBiaxial/+,-
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Birefringence0.009 to 0.012
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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PleochroismOrange/brown stones - strong trichroism: olive green - red brown to violet - yellow brown
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Dispersion0.018 to 0.020
Walter Schumann, Gemstones of the world (2001)
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Colour
Colour (General)Brown, green, yellowish-green, bluish-green, blue
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Causes of ColourBlue, V3+ in octahedral coordination
W. William Hanneman, Pragmatic Spectroscopy For Gemologists (2011)
TransparencyTransparent
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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LustreVitreous
Arthur Thomas, Gemstones (2009)
Fluorescence & other light emissions
Fluorescence (Short Wave UV)Inert to orangy-red - deep red (yellowish stones)
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Fluorescence (Long-Wave UV)Orange-red
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
Crystallography of Axinite
Crystal SystemTriclinic
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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HabitCrystals are characteristically wedge- or axe-shaped.
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Geological Environment
Where found:Occurs in basic igneous and contact metamorphic rocks.
Arthur Thomas, Gemstones (2009)
Spectrographic Data
Calculated Spectra:
Click spectra for more information
Axinite - Locality: Brazil
Inclusions in Axinite
Goethite fibres - Gemmological Tables, Ulrich Henn and Claudio C. Milisenda, 2004, p 18
Further Information
Mineral information:Axinite information at mindat.org
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