Constituent Aragonite | SSHADE

Constituent

Name: Aragonite
IMA name: Aragonite

Class: non-silicate mineral
Compound type: carbonate
Comments: Unknown mass fraction of Aragonite: formed by transformation of Portlandite
Equivalent Space Group: Pmcn (62)

Constituent abundance in material

Relevance: main - major
Arrangement: homogeneous in multi-phases

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.15

Dana

Major class: carbonates, nitrates, borates (V)
Class: anhydrous carbonates (14)
Type: with simple formula A+CO3 (14.01)
Group: Aragonite group (Orthorhombic: Pmcn) (14.01.03)
Code: 14.01.03.01

Phase type: crystalline

Crystallography

Crystal system: orthorhombic
Crystal class: dipyramidal
Crystal class symbol: mmm (D2h)
Crystal spacegroup: Pnma

Texture: unknown

Physical properties

Molar mass: 100.09 $g/mol$
Density: 2.93 $g/cm^3$

Optical properties

Refringence type: biaxial
Refringence sign: negative
Birefringence: 0.156
Refraction index $n_{\alpha}$: 1.529 - 1.53
Refraction index $n_{\beta}$: 1.68 - 1.682
Refraction index $n_{\gamma}$: 1.685-1.686
Color: colorless, white, grey, yellow
Diaphaneity: transparent to translucent
Luster: vitreous