Calcite group | SSHADE

Mineral phase

Formula: $(Ca,Mg,Fe,Mn,Ni,Co,Zn,Cd)CO_3$
Chemical formula: (Ca,Mg,Fe,Mn,Ni,Co,Zn,Cd)CO3
Elemental formula: (Mg2+)0-1 (Ca2+)0-1 (Fe2+)0-1 (Mn2+)0-1 (Co2+)0-1 (Zn2+)0-1 (Cd2+)0-1 (Ni2+)0-0.6 C O (O-)2
Isotope mixture type: terrestrial abundance

Formula	Name	Family	Number min-max	State	Relevance
$Mg^{2+}$	Magnesium(II) cation	element	0 - 1	constituent cation	main
$Ca^{2+}$	Calcium cation	element	0 - 1	constituent cation	main
$Fe^{2+}$	Iron(II) cation	element	0 - 1	constituent cation	main
$Mn^{2+}$	Manganese(II) cation	element	0 - 1	constituent cation	main
$Co^{2+}$	Cobaltous cation	element	0 - 1	constituent cation	main
$Zn^{2+}$	Zinc(II) cation	element	0 - 1	constituent cation	main
$Cd^{2+}$	Cadmium cation	element	0 - 1	constituent cation	main
$Ni^{2+}$	Nickel cation	element	0 - 0.6	constituent cation	main
$(CO_3)^{2-}$	Carbonate anion	chemical function	1	anionic radical	main

Chemical functions

	Function	Number
	$(CO_3)^{2-}$	1

Chemical bonds

	Bond	Number
	$\dddot - \dddot - C \dddot - O^{-2/3}$	3

Oxides

Formula	$CaO$	$CO_{2}$	$MgO$	$FeO$	$MnO$	$CoO$	$ZnO$	$CdO$	$NiO$
Mass fraction (%)

End-members

Crystallography

Refringence type: uniaxial
Refringence sign: negative
Birefringence: 0.172 - 0.255
Refraction index $n_o$ (w): 1.658 - 1.875
Refraction index $n_e$ (e): 1.486 - 1.633
Pure color: colorless, yellow, pink, light green
Color: colorless, white, pink, reddish, reddish white, pinkish red, red, rose red, purple, blue, bluish grey, yellow, green to apple-green, yellowish brown, yellowish gray, brown, gray, gray brown, greenish gray, black,
Diaphaneity: transparent to subtranslucent
Luster: vitreous

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