Synthetic pyroxenes group

Solid phase

Official name: Synthetic pyroxenes group

Family: covalent network solid
Class: chain covalent network solid
Compound type: inosilicate

Formula: $AB.[(Si,Al)O_3]_2\ \ \ \ \$ where $A = Ca, Na, Fe^{2+}$ , and/or $Mg$ , and sometimes $Zn, Mn^{2+}, Li\ \ \$ and $B = Al, Fe^{3+}, Mg, Mn^{3+}, Cr, Sc, Ti, V^{3+}$ and/or $Fe^{2+}$
Chemical formula: (Ca,Na,Fe2+,Mg,Zn,Mn2+,Li)(Al,Fe3+,Mg,Mn3+,Cr,Ti,Sc,V3+,Fe2+)(Si,Al)2O6
Elemental formula: (Ca)0-1 (Na)0-1 (Mg)0-2 (Fe2+)0-2 (Fe3+)0-1 (Mn2+)0-1 (Mn3+)0-1 (Al)0-1 (Zn)0-1 (Li)0-1 (Cr3+)0-1 (Ti)0-0.5 (V3+)0-1 (Sc)0-1 (Si)1-2 O6
Isotope mixture type: terrestrial abundance

30.5

Formula	Name	Family	Number min-max	Mole fraction	Isotope mole fraction	State	Relevance
$Ca$	Calcium	element	0 - 1	0.03278688524590164 $\pm$ 0.03278688524590164	1	constituent element	main
$Na$	Sodium	element	0 - 1	0.03278688524590164 $\pm$ 0.03278688524590164	1	constituent element	main
$Mg$	Magnesium	element	0 - 2	0.06557377049180328 $\pm$ 0.06557377049180328	1	constituent element	main
$Fe^{2+}$	Iron(II) cation	element	0 - 2	0.06557377049180328 $\pm$ 0.06557377049180328	1	constituent element	main
$Fe^{3+}$	Iron(III) cation	element	0 - 1	0.03278688524590164 $\pm$ 0.03278688524590164	1	constituent element	main
$Mn^{2+}$	Manganese(II) cation	element	0 - 1	0.03278688524590164 $\pm$ 0.03278688524590164	1	constituent element	main
$Mn^{3+}$	Manganese(III) cation	element	0 - 1	0.03278688524590164 $\pm$ 0.03278688524590164	1	constituent element	main
$Al$	Aluminium	element	0 - 1	0.03278688524590164 $\pm$ 0.03278688524590164	1	constituent element	main
$Zn$	Zinc	element	0 - 1	0.03278688524590164 $\pm$ 0.03278688524590164	1	constituent element	main
$Li$	Lithium	element	0 - 1	0.03278688524590164 $\pm$ 0.03278688524590164	1	constituent element	main
$Cr^{3+}$	Chromium(III) cation	element	0 - 1	0.03278688524590164 $\pm$ 0.03278688524590164	1	constituent element	main
$Ti$	Titanium	element	0 - 0.5	0.01639344262295082 $\pm$ 0.01639344262295082	1	constituent element	main
$V^{3+}$	Vanadium(III) cation	element	0 - 1	0.03278688524590164 $\pm$ 0.03278688524590164	1	constituent element	main
$Sc$	Scandium	element	0 - 1	0.03278688524590164 $\pm$ 0.03278688524590164	1	constituent element	main
$Si$	Silicon	element	1 - 2	0.09836065573770492 $\pm$ 0.03278688524590164	1	constituent element	main
$O$	Oxygen	element	6	0.39344262295081966	1	constituent element	main

Classification

Class: chain covalent networks (09)

Associated phases

Equivalent mineral: Pyroxene group

Crystallography

Phase type: crystalline
Crystal system: various
Crystal class: various
Crystal class symbol: various
Crystal spacegroup: various

Physical properties

Molar mass: 186.09 - 248.09 $g/mol$
Density: 3.1-4.07 $g/cm^3$

Thermodynamical properties

State NTP: solid

Optical properties

Refringence type: biaxial
Refringence sign: positive or negative
Pure color: various

Links and Publications

Links