Afghanite

Big Photo

Badakhshan, Afghanistan
0.25 carats
© Rarestone.com

Afghanite is named after the country of its discovery.

Afghanite forms sapphire-blue crystals. It can produce attractive gemstones but gem rough is almost unobtainable and good crystals are rare.

Afghanite Gemstones by Colour

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

Afghanite Gemstones by Size

This table shows distribution of Afghanite 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:0.10 cts
Heaviest:0.30 cts
Average:0.19 cts
Total photos:9
Do you have a larger Afghanite? Why not upload a photo?
0.10ct to 0.12ct0.12ct to 0.14ct0.14ct to 0.16ct0.16ct to 0.18ct0.18ct to 0.20ct0.20ct to 0.22ct0.22ct to 0.24ct0.24ct to 0.26ct0.26ct to 0.28ct0.28ct to 0.30ct
General Information
Chemical Formula
(Na,Ca,K)
 
8
(Si,Al)
 
12
O
 
24
(SO
 
4
,Cl,CO
 
3
)
 
3
(H
 
2
O)
Arthur Thomas, Gemstones (2009)
Photos of natural/un-cut material from mindat.org
Physical Properties of Afghanite
Mohs Hardness5.5 to 6
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
Specific Gravity2.55 to 2.65
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
Cleavage QualityPerfect
Arthur Thomas, Gemstones (2009)
FractureConchoidal
Arthur Thomas, Gemstones (2009)
Optical Properties of Afghanite
Refractive Index1.522 to 1.533
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
Optical CharacterUniaxial/+
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
Birefringence0.006
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
Colour
Colour (General)Colourless, blue
Arthur Thomas, Gemstones (2009)
TransparencyTransparent,Translucent
Arthur Thomas, Gemstones (2009)
LustreVitreous
Arthur Thomas, Gemstones (2009)
Fluorescence & other light emissions
Fluorescence (Short Wave UV)Inert
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Fluorescence (Long-Wave UV)Bright orange
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Crystallography of Afghanite
Crystal SystemHexagonal
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
HabitBarrel, massive
Arthur Thomas, Gemstones (2009)
Inclusions in Afghanite
May be speckled with dark blue inclusions of lazurite - Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 8
Further Information
Mineral information:Afghanite information at mindat.org
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