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Minerals - Dolomite | TerraCollect

Mineral - Dolomite

DolomiteCaMg[CO₃]₂

Chemical Properties

Mineral Class

Carbonates

Toxicity

none

Formula

CaMg[CO₃]₂

Unit Cell

a=4.81 c=16.02 Z=3

Physical Properties

Hardness

3.5 - 4

Streak

white

Density

Normal (2-3,5)

Optical Properties

Color

whitebrownyellowviolet

Birefringence

0.179

Luster

Vitreous,

Pearly

Transparency

translucent,

transparent,

opaque

Pleochroism

Geomineralogical Properties

Crystal System

Composition

Elements

Mass

CO₂

47.22

SiO₂

0.12

FeO

0.22

MgO

21.12

CaO

31.27

H₂O

0.02

Canada (Palache et al. 1952)

Groups and Members

Dolomite-Group

Karten-Ebenen

Geologische KarteSatelliten Karte

Cleavage

Perfect after {1011}

Fracture

conchoidal,

uneven

Tenacity

Brittle

trigonal

Point Group

rhombohedral - 3

Space Group

R3 (148)

Habit

Rhombohedron

Formation

Precipitation from sea water, hydrothermal

Paragenesis

Twinning

Contact twins after {1010}, {1121} and {0001}

Rarity

Very common

Synonyms

Dolomite