Leucite

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Physical & Optical Properties

Mohs Hardness 5,5 – 6,0
Specific Gravity 2,45 – 2,5
Refractive Index 1,504 – 1,51
Crystal System Tetragonal
Luster Vitreous
Cleavage Poor
Fracture Conchoidal
Color various
Dispersion 0,01

Mohs Hardness

Mohs Hardness: 5,5 – 6,0
1 Soft10 Hard

Crystal System

a b c Tetragonal a = b ≠ c, α = β = γ = 90°

Value & Market

Price Tier Budget (< $50/ct)

About Leucite

Leucite is a potassium aluminum silicate feldspathoid mineral, typically forming white to gray pseudo-cubic (trapezohedron) crystals embedded in volcanic lavas, with a vitreous to dull luster. It is found in potassium-rich, silica-poor volcanic rocks such as leucitites, with prominent occurrences at Vesuvius and the Alban Hills in Italy, and in the Leucite Hills of Wyoming, USA. Faceted gem-quality material is extremely rare and of collector interest only; leucite's primary significance is volcanological and petrological.

Jewelry Use

Durability 4/10

Science FYI Family

Frequently Asked Questions

What is Leucite?
Leucite is a potassium aluminum silicate feldspathoid mineral, typically forming white to gray pseudo-cubic (trapezohedron) crystals embedded in volcanic lavas, with a vitreous to dull luster. It is found in potassium-rich, silica-poor volcanic rocks such as leucitites, with prominent occurrences at
What is the hardness of Leucite?
Leucite has a Mohs hardness of 5.5 to 6.0, making it moderate for use in jewelry.
What color is Leucite?
Leucite is primarily Various.
How much does Leucite cost?
Leucite falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Leucite?
Leucite belongs to the Tetragonal crystal system.

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