Mineral phase
IMA name
Nyerereite
Secondary names
Natrium calcium carbonate; Na-Ca carbonate
IMA Code
Nye
Type
Class
non-silicate mineral
Compound type
carbonate
Chemical composition
Formula
$Na_2Ca(CO_3)_2$
Chemical formula
Na2Ca(CO3)2
Elemental formula
(Na+)2 (Ca2+) C2 O2 (O-)4
Isotope mixture type
terrestrial abundance
  Formula Name Family Number min-max Isotope mole fraction State Relevance
$Na^+$ Sodium cation element 2 constituent cation main
$Ca^{2+}$ Calcium cation element 1 constituent cation main
$(CO_3)^{2-}$ Carbonate anion chemical function 2 anionic radical main
Chemical functions
  Function Number
$(CO_3)^{2-}$ 2
Chemical bonds
  Bond Number
$Na^+ \cdot O^{-}-$ 2
$\cdot Ca^{2+} \cdot O^{-}-$ 2
$\dddot - \dddot - C \dddot - O^{-2/3}$ 3
Oxides
Formula $Na_{2}O$ $CaO$ $CO_{2}$
Mass fraction (%) 30.08 27.21 42.71

Strunz

Class
carbonates - nitrates (05)
Division
carbonates without additional anions, without H2O (05.A)
Family
Alkali and alkali-earth carbonates (05.AC)
Code
05.AC.10

Dana

Major class
carbonates, nitrates, borates (V)
Class
anhydrous carbonates (14)
Type
with Compound Formula A+2B++(CO3)2 (14.03)
Group
-Nyerereite- group (14.03.04)
Code
14.03.04.01
Phase type
crystalline
Crystal system
orthorhombic
Crystal class
dipyramidal
Crystal class symbol
mmm (D2h)
Crystal spacegroup
Pbca
Comments
initialy assumed to have Cmc2(1) space group
Molar mass
206.08 $g/mol$
Density
2.541 $g/cm^3$
State NTP
solid
Refringence type
biaxial
Refringence sign
negative
Birefringence
0.0230
Refraction index $n_{\alpha}$
1.511
Refraction index $n_{\beta}$
1.533
Refraction index $n_{\gamma}$
1.534
Pure color
colorless
Color
colorless
Diaphaneity
transparent
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