Dolomite | Gemopedia

Dolomite is a white to brownish and sometimes pink-colored mineral named for French mineralogist Dodat Gratet de Dolomieu in 1791. Specimens are usually found in crystal clusters and have been known to be large in size. Transparent dolomite gems can be difficult to find due to their cleavage and low hardness value and are usually preferred as a collectors stone.
Alternate
Names
Dolostone
Colors
White, Gray, Pink, Yellow, Brown

Dolomite Classification

Common Name

Dolomite

Species

NA

Variety

Colors

White, Gray, Pink, Yellow, Brown

Alternate Names

Dolostone

Gemstone Groups

Key Separations

RI

Comments

Dolomite has a high sensitivity to heat.

Dolomite Optical Properties

Transparency

Transparent - Opaque

Refractive Index

1.502-1.698

Birefringence

0.179-0.185

Optic Character

Uniaxial

Optic Sign

Negative

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Variable
LWUV: Variable

CCF Reaction

Pleochroism

None

Dispersion

Strength: weak fire

Comments

Dolomite Chemistry & Crystallography

Chemical Name

calcium magnesium carbonate

Chemical Formula

CaMg(CO3)2

Synthesis

Crystal System

Trigonal

Classification

Carbonate

Nature

Natural

Crystallinity

Crystalline to Aggregate

Comments

Dolomite Characteristic Physical Properties

Hardness

3.5-4

Streak

White

Specific Gravity

2.8-2.95

Toughness

Poor

Inclusions

Luster

Vitreous

Stability

Poor

Fracture

Subconchoidal

Cleavage

Perfect, in one direction

Comments

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