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Bytownite

Big Photo

Mexico
3.03 carats
© Rarestone.com

A rare form of Feldspar, comprises 10-30% Albite and 70-90% Anorthite feldspar. Some of the stones have a distinct resemblance to Andalusite.
3 photos

Bytownite Gemstones by Colour

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

Bytownite Gemstones by Size

This table shows distribution of Bytownite 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:3.03 cts
Heaviest:7.08 cts
Average:5.25 cts
Total photos:3
Do you have a larger Bytownite? Why not upload a photo?
3.03ct to 3.44ct3.44ct to 3.84ct3.84ct to 4.25ct4.25ct to 4.65ct4.65ct to 5.06ct5.06ct to 5.46ct5.46ct to 5.87ct5.87ct to 6.27ct6.27ct to 6.68ct6.68ct to 7.08ct
General Information
A variety or type of:Anorthite, which is a variety of Feldspar
Chemical Formula
Ca(70-90%)Na(30-10%)(Al,Si)AlSi
 
2
O
 
8
Michael O’Donoghue, Gems, Sixth Edition (2006)
Physical Properties of Bytownite
Mohs Hardness6 to 6.5
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
Specific Gravity2.71
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
TenacityBrittle
Michael O’Donoghue, Gems, Sixth Edition (2006)
Cleavage QualityPerfect
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
FractureUneven,Conchoidal
Michael O’Donoghue, Gems, Sixth Edition (2006)
Refractive Index1.565 to 1.574
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
Optical CharacterBiaxial/-
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
Birefringence0.009
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
Dispersion
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