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Crystal Dolomite

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Chemical Formula

CaMg(CO3)2

Composition

Calcium magnesium carbonate. The amount of calcium and magnesium in most specimens is equal, but occasionally one element may have a slightly greater presence than the other. Small amounts of iron and manganese are sometimes also present.

Variable Formula

(Ca,Mg)2(CO3)2
(Ca,Mg,Fe,Mn)2(CO3)2

Color

Colorless, white, gray, peach, pink, yellow, and orange. Rarely yellow, green, red, and black.

Streak

White

Hardness

3.5 - 4

Crystal System

Hexagonal

3D Crystal Atlas
(Click for animated model) 

Rhombohedral

Rhombohedral with Modified Edges

Tabular

Elongated Prismatic

Rhombohedral Contact Twins

Rhombohedral Penetration Twins

       

Crystal Forms 
and Aggregates

Common in groups of small rhombohedral crystals, often with curved, saddle-like faces. Also prismatic, (although usually slightly curved), grainy, botryoidal, coxcomb, and massive. Uncommon in large rhombohedrons or rhombohedral aggregates.
 

Transparency

Transparent to translucent

Specific Gravity

2.8 - 3.0

Luster

Vitreous, pearly

Cleavage

1,3 - rhombohedral

Fracture

Conchoidal

Tenacity

Brittle

Other ID Marks

Occasionally fluorescent bluish-white or pink in shortwave ultraviolet light.

Complex Tests

Effervesces in hydrochloric acid. Slowly dissolves in nitric acid and hydrochloric acids.

In Group

Carbonates;

Striking Features

Curved crystals and crystal groupings, associate minerals and environment

Environment

In sedimentary rock such as dolomite rock and limestones. Occasionally in high-temperature metamorphic rocks and low-temperature hydrothermal veins.
 

Rock Type

Igneous, Sedimentary, Metamorphic

Popularity (1-4)

2

Prevalence (1-3)

1

Demand (1-3)

1

 

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