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

1 Talc 2 Gypsum 3 Calcite 4 Fluorite 5 Apatite 6 Orthoclase 7 Quartz 8 Topaz 9 Corundum 10 Diamond Anhydrite
Mohs hardness of Anhydrite shown against the ten reference minerals, from talc (1) to diamond (10).
Mohs Reference mineral Anhydrite
1 Talc
2 Gypsum
3 Calcite
4 Fluorite
5 Apatite
6 Orthoclase
7 Quartz
8 Topaz
9 Corundum
10 Diamond

Crystal System

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

Value & Market

Price Tier Budget (< $50/ct)

About Anhydrite

La anhidrita es un sulfato de calcio anhidro (sin agua) que cristaliza en el sistema ortorrómbico, generalmente en masas granulares o lamelares de color blanco, gris, azulado o violáceo. Se forma en depósitos de evaporitas, frecuentemente asociada al yeso (su equivalente hidratado) y a la halita. Aunque rara como gema facetada debido a su moderada dureza y exfoliación perfecta, los ejemplares de color azul o violeta son ocasionalmente utilizados en joyería. Se emplea principalmente como roca ornamental y en construcción. Su nombre deriva del griego 'anhydros', que significa 'sin agua', distinguiéndola del yeso.

Science FYI Family

Frequently Asked Questions

What is Anhydrite?
La anhidrita es un sulfato de calcio anhidro (sin agua) que cristaliza en el sistema ortorrómbico, generalmente en masas granulares o lamelares de color blanco, gris, azulado o violáceo. Se forma en depósitos de evaporitas, frecuentemente asociada al yeso (su equivalente hidratado) y a la halita. Au
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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