Xonotlite

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Physical & Optical Properties

Mohs Hardness 6.0 – 6.5
Specific Gravity 2.71 – 2.72
Refractive Index 1.581 – 1.593
Crystal System Monoclinic
Luster Pearly,Greasy
Cleavage Perfect
Fracture Splintery
Color various
Birefringence 0.01

Mohs Hardness

Mohs Hardness: 6.0 – 6.5
1 Soft10 Hard

Crystal System

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

Value & Market

Price Tier Moderate ($50-500/ct)

About Xonotlite

Xonotlite is a calcium silicate hydroxide mineral forming white to grayish fibrous or massive aggregates with a silky to pearly luster in contact metamorphic zones and hydrothermal environments. Named after Tetela de Xonotla in Mexico where it was first described, it also occurs in California, Italy, and Japan. Its fibrous habit and pearly luster make specimen slabs attractive, and it has technical applications in thermal insulation and building materials.

Jewelry Use

Durability 5/10

Science FYI Family

Frequently Asked Questions

What is Xonotlite?
Xonotlite is a calcium silicate hydroxide mineral forming white to grayish fibrous or massive aggregates with a silky to pearly luster in contact metamorphic zones and hydrothermal environments. Named after Tetela de Xonotla in Mexico where it was first described, it also occurs in California, Italy
What is the hardness of Xonotlite?
Xonotlite has a Mohs hardness of 6.0 to 6.5, making it moderate for use in jewelry.
What color is Xonotlite?
Xonotlite is primarily Various.
How much does Xonotlite cost?
Xonotlite falls into the Moderate ($50-500/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Xonotlite?
Xonotlite belongs to the Monoclinic crystal system.

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