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Anhydrite

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Chemical Formula

CaSO4

Composition

Calcium sulfate

Color

Colorless, white, yellow, gray, blue, orange-red, red, pink, purple.

Streak

White to light gray

Hardness

3 - 3.5

Crystal System

Orthorhombic

3D Crystal Atlas
(Click for animated model) 

Octagonal Orthorhombic

Orthorhombic Prismatic

Contact Twin

       

Crystal Forms 
and Aggregates

Individual crystals, which are tabular and prismatic, are uncommon. Often fibrous, in parallel veins that break off into cleavage fragments, and as fan-like groupings. Also grainy, massive, nodular, as rectangular cleavage fragments, and as easily cleavable crystal groupings.

Transparency

Transparent to translucent

Specific Gravity

2.9 - 3.0

Luster

Vitreous to pearly

Cleavage

2,3 - forming a cube

Fracture

Uneven to splintery

Tenacity

Brittle

Other ID Marks

Many specimens are fluorescent.

Complex Tests

Specimens that are not fluorescent may become fluorescent after heating.

In Group

Sulfates; Anhydrous Sulfates

Striking Features

Cleavage properties, crystal habits, and low specific gravity.

Environment

In sedimentary rock layers, in salt domes, and in igneous traprock.
 

Rock Type

Igneous, Sedimentary

Popularity (1-4)

2

Prevalence (1-3)

3

Demand (1-3)

1

 

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