Constituent Calcite | SSHADE

Constituent

Name: Calcite
IMA name: Calcite

Class: non-silicate mineral
Compound type: carbonate

Constituent abundance in material

Relevance: impurity
Arrangement: complex intimate mix
Mass fraction: 0.005 $\pm$ 0.002
Abundance comments: poorly known Calcite mass fraction, probably < 0.007 (for raw Swy-2 and 0.004 for < 2µm size - Vogt 2002)

Chemical composition

Formula: $CaCO_3$
Chemical formula: CaCO3
Elemental formula: Ca C O3
Isotope mixture type: terrestrial abundance

	Formula	Name	Family	Number min-max	Isotope mole fraction	State	Relevance
	$Ca^{2+}$	Calcium cation	element	1		constituent cation	main
	$(CO_3)^{2-}$	Carbonate anion	chemical function	1		anionic radical	main

Chemical functions and bonds

Chemical functions

	Function	Number
	$(CO_3)^{2-}$	1

Chemical bonds

	Bond	Number
	$\cdot Ca^{2+} \cdot O^{-}-$	2
	$\dddot - \dddot - C \dddot - O^{-2/3}$	3

Oxides composition

Oxides

Formula	$CaO$	$CO_{2}$
Mass fraction (%)	56.03	43.97

Classifications

Strunz

Class: carbonates - nitrates (05)
Division: carbonates without additional anions, without H2O (05.A)
Family: Alkali-earth (and other M2+) carbonates (05.AB)
Code: 05.AB.05

Dana

Major class: carbonates, nitrates, borates (V)
Class: anhydrous carbonates (14)
Type: with simple formula A+CO3 (14.01)
Group: Calcite group (Trigonal: R-3c) (14.01.01)
Code: 14.01.01.01

Phase type: crystalline

Crystallography

Crystal system: trigonal
Crystal class: ditrigonal-scalenohedral
Crystal class symbol: -3m (D3d)
Crystal spacegroup: R-3c

Physical properties

Molar mass: 100.09 $g/mol$
Density: 2.71 $g/cm^3$

Optical properties

Refringence type: uniaxial
Refringence sign: negative
Birefringence: 0.172
Refraction index $n_{\alpha}$: 1.658
Refraction index $n_{\beta}$: 1.486
Color: colorless, white, pink, yellow, brown
Diaphaneity: transparent to translucent
Luster: vitreous