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Anhydrite

Anhydrite

By Tim Matthews, JD, FGA, GG, DGA,
CEO and President of JTV
Published: June 2014
Modified: March 2022
Anhydrite Rough Anhydrite Jewelry
Table of Contents
  • General Information
  • Anhydrite Colors
  • Alternate Names
  • Countries of Origin
  • Care
  • Species/Variety

Anhydrite gets its name from the Greek word “anhydrous” which translates to “without water”. If anhydrite is exposed to humidity or water, it readily alters to gypsum. It is often fibrous and takes on the appearance of fan-like groupings. It can also form cubes. When it is massive it is hard to distinguish from it from calcite, gypsum, or halite.

General Information

  • Classification
  • Optical Properties
  • Characteristic Physical Properties
  • Chemistry & Crystallography
Common Name
Anhydrite
Species
Anhydrite
Transparency
Translucent-Transparent
Dispersion
Strength: Weak Fire Value: 0.013
Refractive Index
1.570-1.614
Optic Character
Biaxial
Optic Sign
Positive
Polariscope Reaction
Aggregate (AGG), Doubly Refractive (DR)
Fluorescence
LWUV: blue, pink, white
CCF Reaction
blue, red, white
Streak
White
Luster
Vitreous, Greasy, Pearly
Stability
Brittle
Fracture
Uneven to Splintery
Cleavage
Perfect cleavage in 3 directions often forming cubes
Chemical Name
Calcium sulfate
Chemical Formula
CaSO4
Crystal System
Orthorhombic
Chemistry Classification
Sulfate

Anhydrite Colors

  • Brown Anhydrite
    Brown
  • White Anhydrite
    White
  • Colorless Anhydrite
    Colorless
  • Blue Anhydrite
    Blue
  • Gray Anhydrite
    Gray
  • Red Anhydrite
    Red
  • Pink Anhydrite
    Pink

Alternate Names

Cube spar

Countries of Origin

Papua New Guinea; Angola; Kazakhstan; Portugal; Greece; Mongolia; Morocco; Unknown; Mali; Panama; Guatemala; Iraq; Chile; Argentina; Ukraine; Zambia; Congo; India; Canada; Turkey; Belgium; Namibia; Finland; South Africa; Georgia; Peru; Turkmenistan; Germany; Tanzania, United Republic Of; Fiji; Viet Nam; Madagascar; Thailand; United Kingdom of Great Britain and Northern Ireland; Costa Rica; Sweden; Poland; Bulgaria; Jordan; Tunisia; Kenya; Switzerland; Spain; Djibouti; Cuba; Burkina Faso; Israel; Australia; Tajikistan; Myanmar; Malaysia; Iceland; Oman; Armenia; Austria; Mozambique; El Salvador; Brazil; Algeria; Slovenia; Colombia; Ecuador; Iran (Islamic Republic of); Hungary; Japan; Taiwan (Province of China); Bolivia (Plurinational State of); Lao People's Democratic Republic; New Zealand; Vanuatu; United States Minor Outlying Islands; Italy; Antarctica; Ethiopia; Afghanistan; Russian Federation; Czechia; Egypt; Malta; Saudi Arabia; Netherlands; Pakistan; China; Ireland; Qatar; Slovakia; France; Lithuania; Serbia; Kyrgyzstan; Romania; Philippines; Uzbekistan; Norway; Denmark; Dominican Republic; Mexico; Zimbabwe; Greenland; Indonesia

Care

Special care needs to be taking with anhydrite because it is brittle with perfect cleavage and will alter to gypsum if exposed to water.

Species/Variety

Angelite

Angelite is the bluish gray translucent variety of anhydrite from Lima, Peru that was discovered in 1987. Since it is soft it can be carved or shaped into decorative objects and is polished into cabochons and beads for jewelry.

Angelite Anhydrite
Angelite Anhydrite
  • Classification
Common Name
Angelite
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