Ettringite

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Physical & Optical Properties

Category Collector Gems
Mohs Hardness 2,0 – 2,5
Specific Gravity 1,77
Refractive Index 1,47 – 1,491
Crystal System Hexagonal
Cleavage Perfect
Color various
Birefringence 0,021

Mohs Hardness

Mohs Hardness: 2,0 – 2,5
1 Soft10 Hard

Crystal System

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

Value & Market

Price Tier Budget (< $50/ct)

Where to Buy Ettringite

Amazon Wide selection

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About Ettringite

Ettringite is a calcium aluminum sulfohydrate mineral forming small, bright yellow prismatic crystals in contact metamorphic and alkaline igneous rocks, as well as in concrete as a result of chemical reactions (where it can cause structural damage). Fine mineral specimens displaying pale to bright yellow translucent crystals come primarily from N'Chwaning Mine in South Africa's Kalahari Manganese Field. Faceted ettringite is an extraordinary specialist rarity.

Jewelry Use

Durability 1/10

Science FYI Family

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Frequently Asked Questions

What is Ettringite?
Ettringite is a calcium aluminum sulfohydrate mineral forming small, bright yellow prismatic crystals in contact metamorphic and alkaline igneous rocks, as well as in concrete as a result of chemical reactions (where it can cause structural damage). Fine mineral specimens displaying pale to bright y
What is the hardness of Ettringite?
Ettringite has a Mohs hardness of 2.0 to 2.5, making it relatively soft for use in jewelry.
What color is Ettringite?
Ettringite is primarily Various.
How much does Ettringite cost?
Ettringite falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Ettringite?
Ettringite belongs to the Hexagonal crystal system.