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0.9.5

Minerals - Calcite | TerraCollect

Mineral - Calcite

CalciteCaCO₃

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Chemical Properties

Mineral Class

Carbonates

Toxicity

none

Formula

CaCO₃

Unit Cell

a=4.99 c=17.06 Z=6

Physical Properties

Hardness

3

Streak

white

Density

Normal (2-3,5)

Optical Properties

Color

whiteblackbrowngrayredyellowgreenbluepinkcolorless

Birefringence

0.172

Luster

Vitreous,

Pearly

Transparency

translucent,

transparent,

opaque

Pleochroism

Composition

Elements

Mass

CO₂

44.22

FeO

0.43

MgO

1.74

CaO

53.60

USA (Palache et al. 1952)

Groups and Members

Calcite-Group

Map-Layer

Geological MapSatellite Map

Cleavage

Perfect after {1011}

Fracture

conchoidal

Tenacity

Brittle

Geomineralogical Properties

Crystal System

trigonal

Point Group

ditrigonal-scalenohedral - 3m

Space Group

R3c (167)

Habit

dipyramidal, granular, crusty, spherical, massive, prismatic, Rhombohedron, Scalenohedron, spear-shaped, stalactitic, tabular

Formation

Magmatic, sedimentary, metamorphic

Paragenesis

Twinning

After multiple {hkl}

Rarity

Very common

Synonyms

Calcite

Varieties

Glendonit, Kobaltocalcit, Manganocalcit, Doppelspat, Islandspat, Kanonenspat, Honigcalcit