Mineral phase
IMA name
Minrecordite
Secondary names
Zinc calcium carbonate; Zn-Ca carbonate
IMA Code
Mrd
Type
Class
non-silicate mineral
Compound type
carbonate
Chemical composition
Formula
$CaZn(CO_3)_2$
Chemical formula
CaZn(CO3)2
Elemental formula
(Ca2+) (Zn2+) C2 O2 (O-)4
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
$Zn^{2+}$ Zinc(II) 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
$\cdot Ca^{2+} \cdot O^{-}-$ 2
$\cdot Zn^{2+} \cdot O^{-}-$ 2
$\dddot - \dddot - C \dddot - O^{-2/3}$ 3
Oxides
Formula $CaO$ $ZnO$ $CO_{2}$
Mass fraction (%) 24.87 36.1 39.04

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.10

Dana

Major class
carbonates, nitrates, borates (V)
Class
anhydrous carbonates (14)
Type
with compound formula A+B++(CO3)2 (14.02)
Group
Dolomite group (Trigonal: R-3) (14.02.01)
Code
14.02.01.04
Phase type
crystalline
Crystal system
trigonal
Crystal class
rhombohedral
Crystal class symbol
-3 (S6)
Crystal spacegroup
R-3
Molar mass
225.49 $g/mol$
Density
3.45 $g/cm^3$
State NTP
solid
Refringence type
uniaxial
Refringence sign
negative
Birefringence
0.20
Refraction index $n_o$ (w)
1.75
Refraction index $n_e$ (e)
1.55
Color
colorless, white
Diaphaneity
transparent to translucent
Luster
pearly
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