Anhydrite

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Physical & Optical Properties

Mohs Hardness 3.5
Specific Gravity 2.9 – 2.98
Refractive Index 1.57 – 1.614
Crystal System Orthorhombic
Luster Vitreous
Cleavage Perfect
Fracture Uneven
Color various
Birefringence 0.044
Dispersion 0.013
Pleochroism Weak

Mohs Hardness

Mohs Hardness: 3.5
1 Soft10 Hard

Crystal System

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

Value & Market

Price Tier Budget (< $50/ct)

About Anhydrite

Anhydrite is a calcium sulfate mineral chemically identical to gypite but lacking water, occurring in massive, granular, or lamellar form in sedimentary evaporite deposits worldwide. It ranges from colorless to white, blue, gray, or pale violet, and occasional transparent blue specimens are cut as collector gemstones. The finest blue gem-quality anhydrite comes from Peru and Germany, where it can resemble pale aquamarine.

Jewelry Use

Durability 2/10

Science FYI Family

Frequently Asked Questions

What is Anhydrite?
Anhydrite is a calcium sulfate mineral chemically identical to gypite but lacking water, occurring in massive, granular, or lamellar form in sedimentary evaporite deposits worldwide. It ranges from colorless to white, blue, gray, or pale violet, and occasional transparent blue specimens are cut as c
What is the hardness of Anhydrite?
Anhydrite has a Mohs hardness of 3.5, making it relatively soft for use in jewelry.
What color is Anhydrite?
Anhydrite is primarily Various.
How much does Anhydrite cost?
Anhydrite falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Anhydrite?
Anhydrite belongs to the Orthorhombic crystal system.

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