Gypsum

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Physical & Optical Properties

Category Collector Gems
Mohs Hardness 2,0
Specific Gravity 2,2 – 2,4
Refractive Index 1,521 – 1,531
Crystal System Monoclinic
Luster Vitreous,Silky
Fracture Uneven
Color various
Birefringence 0,01
Pleochroism Nil

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 Gypsum

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About Gypsum

Gypsum is a calcium sulfate hydrate mineral, widely known as the ornamental variety selenite when forming transparent crystalline plates, and as alabaster when occurring in fine-grained massive form ideal for carving. It is one of the most abundant minerals on Earth, deposited in evaporite sequences on every continent, and has been carved into vessels, statues, and architectural decorations since ancient Mesopotamia and Egypt. Desert rose gypsum, satin spar, and massive alabaster varieties are all fashioned into decorative objects and collector specimens.

Jewelry Use

Durability 1/10

Science FYI Family

Frequently Asked Questions

What is Gypsum?
Gypsum is a calcium sulfate hydrate mineral, widely known as the ornamental variety selenite when forming transparent crystalline plates, and as alabaster when occurring in fine-grained massive form ideal for carving. It is one of the most abundant minerals on Earth, deposited in evaporite sequences
What is the hardness of Gypsum?
Gypsum has a Mohs hardness of 2.0, making it relatively soft for use in jewelry.
What color is Gypsum?
Gypsum is primarily Various.
How much does Gypsum cost?
Gypsum falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Gypsum?
Gypsum belongs to the Monoclinic crystal system.