Class

non-silicate mineral

Compound type

carbonate

Comments

from Vogt et al. (2002)

Composition comments

Common impurities: Fe, Mn, Co, Pb, Zn

Chemical functions

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

Chemical bonds

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

Oxides

Formula	$CaO$	$MgO$	$CO_{2}$
Mass fraction (%)	30.41	21.86	47.73

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

14.02.01.01

Phase type

crystalline

Crystal system

trigonal

Crystal class

rhombohedral

Crystal class symbol

-3 (S6)

Crystal spacegroup

R-3

Texture

unknown

Molar mass

184.40 $g/mol$

Density

2.8 - 2.9 $g/cm^3$

Refringence type

uniaxial

Refringence sign

negative

Birefringence

0.179 - 0.181

Refraction index $n_{\alpha}$

1.679 - 1.681

Refraction index $n_{\beta}$

1.50

Color

white, gray, reddish white, brownish white

Diaphaneity

transparent to translucent

Luster

vitreous