Satin Spar

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Physical & Optical Properties

Category Collector Gems
Mohs Hardness 2.0
Specific Gravity 1.52 – 1.53
Crystal System Monoclinic
Luster Silky,Pearly
Color various

Mohs Hardness

Mohs Hardness: 2.0
1 Soft10 Hard

Crystal System

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

Value & Market

Price Tier Budget (< $50/ct)

Where to Buy Satin Spar

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About Satin Spar

Satin Spar is a fibrous variety of either gypsum or calcite that exhibits a brilliant silky chatoyancy due to its parallel fiber structure, producing striking optical effects when cut as cabochons or polished rods. The most common form is gypsum satin spar, which is white to colorless with a luminous pearly sheen, and is quarried in large quantities in Derbyshire, England, and Mexico. Its glowing white appearance and availability in large pieces make it a popular decorative material.

Jewelry Use

Durability 1/10

Science FYI Family

Frequently Asked Questions

What is Satin Spar?
Satin Spar is a fibrous variety of either gypsum or calcite that exhibits a brilliant silky chatoyancy due to its parallel fiber structure, producing striking optical effects when cut as cabochons or polished rods. The most common form is gypsum satin spar, which is white to colorless with a luminou
What is the hardness of Satin Spar?
Satin Spar has a Mohs hardness of 2.0, making it relatively soft for use in jewelry.
What color is Satin Spar?
Satin Spar is primarily Various.
How much does Satin Spar cost?
Satin Spar falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Satin Spar?
Satin Spar belongs to the Monoclinic crystal system.