Calcite Satin Spar

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Physical & Optical Properties

Mohs Hardness 3.0
Specific Gravity 2.67 – 2.73
Refractive Index 1.486 – 1.658
Crystal System Trigonal
Luster Vitreous,Resinous
Cleavage Perfect
Fracture Conchoidal
Color various
Birefringence 0.172

Mohs Hardness

Mohs Hardness: 3.0
1 Soft10 Hard

Crystal System

a a a Trigonal (Rhombohedral) a = b = c, α = β = γ ≠ 90°

Value & Market

Price Tier Budget (< $50/ct)

About Calcite Satin Spar

Calcite satin spar is a fibrous, silky variety of calcite that displays a gentle, undulating white chatoyancy reminiscent of satin fabric when polished into cabochons. Unlike selenite satin spar (gypsum), calcite satin spar is slightly harder and more durable, though still quite soft for jewelry use. It is found primarily in Mexico, where large fibrous masses are carved into palmstones, massage wands, and decorative objects.

Jewelry Use

Durability 2/10

Science FYI Family

Frequently Asked Questions

What is Calcite Satin Spar?
Calcite satin spar is a fibrous, silky variety of calcite that displays a gentle, undulating white chatoyancy reminiscent of satin fabric when polished into cabochons. Unlike selenite satin spar (gypsum), calcite satin spar is slightly harder and more durable, though still quite soft for jewelry use
What is the hardness of Calcite Satin Spar?
Calcite Satin Spar has a Mohs hardness of 3.0, making it relatively soft for use in jewelry.
What color is Calcite Satin Spar?
Calcite Satin Spar is primarily Various.
How much does Calcite Satin Spar cost?
Calcite 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 Calcite Satin Spar?
Calcite Satin Spar belongs to the Trigonal crystal system.

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