Thaumasite

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Physical & Optical Properties

Mohs Hardness 3.5
Specific Gravity 1.91
Refractive Index 1.467 – 1.505
Crystal System Hexagonal
Luster Vitreous
Cleavage Poor
Fracture Sub-Conchoidal
Color various
Birefringence 0.038

Mohs Hardness

Mohs Hardness: 3.5
1 Soft10 Hard

Crystal System

a a c Hexagonal a = b ≠ c, α = β = 90°, γ = 120°

Value & Market

Price Tier Budget (< $50/ct)

About Thaumasite

Thaumasite is a rare calcium silicate sulfate carbonate mineral that forms colorless to white acicular or prismatic hexagonal crystals in low-temperature hydrothermal veins and as a weathering product in building materials, particularly concrete affected by sulfate attack. It occurs in classic localities such as Långban, Sweden and in oxidized iron ore deposits in the Alps. Specimens are primarily of scientific interest, prized by collectors for delicate crystal habit.

Jewelry Use

Durability 2/10

Science FYI Family

Frequently Asked Questions

What is Thaumasite?
Thaumasite is a rare calcium silicate sulfate carbonate mineral that forms colorless to white acicular or prismatic hexagonal crystals in low-temperature hydrothermal veins and as a weathering product in building materials, particularly concrete affected by sulfate attack. It occurs in classic local
What is the hardness of Thaumasite?
Thaumasite has a Mohs hardness of 3.5, making it relatively soft for use in jewelry.
What color is Thaumasite?
Thaumasite is primarily Various.
How much does Thaumasite cost?
Thaumasite falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Thaumasite?
Thaumasite belongs to the Hexagonal crystal system.

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