Constituent
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)
Arrangement
homogeneous in multi-phases
Abundance comments
Unknown mass fraction of Aragonite: formed by transformation of Portlandite
Formula
$CaCO_3$
Chemical formula
CaCO3
Elemental formula
O3 Ca C
Isotope mixture type
terrestrial abundance
  Formula Name Family Number min-max Isotope mole fraction State Relevance
$C$ Carbon element 1.0 constituent element main
$Ca$ Calcium element 1.0 constituent element main
$O$ Oxygen element 3.0 constituent element main
Chemical functions
  Function Number
$\bullet(CO_3)^{2-}$ 1
Chemical bonds
  Bond Number
$>C=O$ 1
$\eqslantgtr C-O^-$ 2
Oxides
Formula CO2 CaO
Mass fraction (%) 43.97 56.03

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
Crystal system
orthorhombic
Crystal class
dipyramidal
Crystal class symbol
mmm (D2h)
Crystal spacegroup
Pnma
Texture
unknown
Molar mass
100.09 $g/mol$
Density
2.93 $g/cm^3$
Refringence type
biaxial
Refringence sign
negatif
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