Leucite Value, Price, and Jewelry Information


Leucite
By Parent Géry (Own work) [CC-BY-SA-3.0], via Wikimedia Commons

Leucite is abundant in various lava rocks but is extremely rare in facetable crystals. The material has little appeal except for its extreme scarcity. Stones often have a slight milky or cloudy look, and anything over 3 carats is likely to be included.

Leucite Value

The International Gem Society (IGS) has a list of businesses offering gemstone appraisal services.

Leucite Information

DataValue
NameLeucite
Crystallography Tetragonal (pseudo-cubic). Crystals trapezohedral; granular.
Colors Colorless, white, gray, yellowish.
Luster Vitreous; dull on some crystals.
Fracture Conchoidal; brittle.
Hardness 5.5-6.
Specific Gravity 2.47-2.50.
Birefringence Low to zero.
Cleavage Poor.
Stone SizesItalian material has been cut to about 3 carats. There is very little of this material, always small, and clean only in very tiny stones.
Luminescence Medium-bright orange in LW (Italy) or none. Bluish glow in X-rays.
FormulaKAISi2O6.

Optics: Isotropic; N – 1.50.

Optically (+) if uniaxial.

Occurrence: in potassium-rich basic lavas. Wyoming: Montana: Arkansas: New Jersey.

British Columbia: France; Germany: Zaire: Uganda; Australia.

Alban Hills, near Rome, Italy: source of the world’s only transparent leucite crystals. These are colorless, up to about 1 cm.

Comments: Leucite is abundant in various lava rocks but is extremely rare in facetable crystals. The material has little appeal except for its extreme scarcity. Stones often have a slight milky or cloudy look, and anything over 3 carats is likely to be included.

Name: From the Greek leukos, meaning white.