Sanidine

Sanidine is a glassy variety of Orthoclase feldspar that occurs in the German Rhineland and in USA. Colourless, beige and attractive warm-brown stones are faceted.

Sanidine Gemstones by Colour

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

Sanidine Gemstones by Size

This table shows distribution of Sanidine 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:2.50 cts
Heaviest:40.13 cts
Average:12.34 cts
Total photos:14
Do you have a larger Sanidine? Why not upload a photo?
2.50ct to 6.26ct6.26ct to 10.03ct10.03ct to 13.79ct13.79ct to 17.55ct17.55ct to 21.32ct21.32ct to 25.08ct25.08ct to 28.84ct28.84ct to 32.60ct32.60ct to 36.37ct36.37ct to 40.13ct
General Information
A variety or type of:Orthoclase, which is a variety of Feldspar
Chemical Formula
KAlSi
 
3
O
 
8
Michael O’Donoghue, Gems, Sixth Edition (2006)
Sanidine Treatments
Some sanidine subjected to iridation turns amber or smoky coloured.
Physical Properties of Sanidine
Mohs Hardness6
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
Specific Gravity2.54 to 2.61
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
TenacityBrittle
Michael O’Donoghue, Gems, Sixth Edition (2006)
Cleavage QualityGood
Michael O’Donoghue, Gems, Sixth Edition (2006) Excellent to good
FractureUneven,Conchoidal
Michael O’Donoghue, Gems, Sixth Edition (2006)
Refractive Index1.518 to 1.536
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
Optical CharacterBiaxial/-
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
Birefringence0.005 to 0.008
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
PleochroismWeak
Michael O’Donoghue, Gems, Sixth Edition (2006)
Dispersion
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