Leucite

Big Photo

Italy
0.59 carats
© Rarestone.com

Leucite is named after Greek "leukos" - white, alluding to its typical colour.

Crystals are often twinned. Transparent facet rough is very rare.

Leucite is a rare mineral, the volcanic lava of Mount Vesuvius in Italy is the principal source of this material.

Leucite Gemstones by Colour

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

Leucite Gemstones by Size

This table shows distribution of Leucite 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:0.51 cts
Heaviest:0.59 cts
Average:0.54 cts
Total photos:4
Do you have a larger Leucite? Why not upload a photo?
0.51ct to 0.52ct0.52ct to 0.53ct0.53ct to 0.53ct0.53ct to 0.54ct0.54ct to 0.55ct0.55ct to 0.56ct0.56ct to 0.57ct0.57ct to 0.57ct0.57ct to 0.58ct0.58ct to 0.59ct
General Information
Chemical Formula
KAlSi
 
2
O
 
6
Michael O’Donoghue, Gems, Sixth Edition (2006)
More from other references
Photos of natural/un-cut material from mindat.org
Physical Properties of Leucite
Mohs Hardness5.5 to 6
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
Specific Gravity2.45 to 2.50
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Cleavage QualityPoor
Arthur Thomas, Gemstones (2009)
FractureConchoidal
Arthur Thomas, Gemstones (2009)
Optical Properties of Leucite
Refractive Index1.504 to 1.510
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
Optical CharacterUniaxial/+
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Birefringence0.000 to 0.001
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Dispersion0.010
Arthur Thomas, Gemstones (2009)
Colour
Colour (General)Colourless, white, yellowish
Walter Schumann, Gemstones of the world (2001)
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TransparencyTransparent
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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LustreVitreous
Arthur Thomas, Gemstones (2009)
Fluorescence & other light emissions
Fluorescence (Long-Wave UV)Mostly inert, sometimes orange to violet
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
Fluorescence (X-RAY)Some but not all specimens may show bluish colour
Michael O’Donoghue, Gems, Sixth Edition (2006)
Crystallography of Leucite
Crystal SystemTetragonal
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
HabitPseudo-cubic
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
Geological Environment
Where found:Occurs with potassium-rich mafic and ultramafic lavas
Michael O’Donoghue, Gems, Sixth Edition (2006)
Further Information
Mineral information:Leucite information at mindat.org
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