Constituent Calcium amphibole | SSHADE

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Constituent

Name: Calcium amphibole
IMA name: Calcium Amphibole Subgroup

Class: silicate mineral
Compound type: inosilicate

Constituent abundance in material

Relevance: main - major
Arrangement: single phase
Mass fraction: 1.0

Chemical composition

Formula: $Na_{0-1}Ca_2((Mg^{2+},Fe^{2+})_{5-m}(Al,Fe^{3+},Ti)_m)(Si_{8-(n+m)}Al_{(n+m)})O_{22}(OH,F)_2$ \ \ \ \ \ with m = 0, 1, 2
Chemical formula: (Na)0-1Ca2(Mg,Fe,Al,Ti)5(Si,Al)8O22(OH,F)2
Elemental formula: (Ca)2-3 (Na+)0-1 (Mg2+)0-5 (Fe2+)0-5 (Al3+)0-5 (Fe3+)0-2 (Ti4+)0-1 (Si)5-8 O22 (F)0-2 (H)0-2 (O-)0-2
Isotope mixture type: terrestrial abundance

	Formula	Name	Family	Number min-max	Isotope mole fraction	State	Relevance
	$Ca$	Calcium	element	2 - 3		constituent element	main
	$Na^+$	Sodium cation	element	0 - 1		constituent element	main
	$Mg^{2+}$	Magnesium(II) cation	element	0 - 5		constituent element	main
	$Fe^{2+}$	Iron(II) cation	element	0 - 5		constituent element	main
	$Al^{3+}$	Aluminium(III) cation	element	0 - 5		constituent element	main
	$Fe^{3+}$	Iron(III) cation	element	0 - 2		constituent element	main
	$Ti^{4+}$	Titanium(IV) cation	element	0 - 1		constituent element	main
	$Si$	Silicon	element	5 - 8		constituent element	main
	$O$	Oxygen	element	22		constituent element	main
	$F$	Fluorine	element	0 - 2		constituent element	main
	$(OH)^-$	Hydroxide anion	chemical function	0 - 2		anionic radical	main

Composition comments: with Mg+Fe+Mn+Li < 1.5, and Ca+Na ≥ 1.00 and Na < 0.50 -- K+, (and Ba2+, Sr2+, Ca2+, Li+) can replace Na+; Na+, Mg2+, Fe2+, Mn2+, Li+ (and Sr2+, Ba2+, Mn2+, Fe2+, Co2+, Ni2+, Zn2+, Mg2+, Pb2+, Cu, Zr, Mn3+, Cr3+, V, Fe3+) can partly replace Ca2+; Mn2+, Li+, Zn2+, Ni2+, Co2+, Fe3+, V, Cr3+, Mn3+, Zr can partly replace (Mg,Fe,Al,Ti); Ti can partly replace (Si,Al); Cl, O can partly replace (OH,F)

Chemical functions and bonds

Chemical functions

	Function	Number
	$(OH)^-$

Chemical bonds

	Bond	Number
	$O^--H$	1

Oxides composition

Oxides

Formula	$CaO$	$Na_{2}O$	$MgO$	$FeO$	$Fe_{2}O_{3}$	$Al_{2}O_{3}$	$TiO_{2}$	$SiO_{2}$	$F$	$H_{2}O$
Mass fraction (%)

Classifications

Strunz

Class: silicates (09)
Division: inosilicate (09.D)
Family: with 2-periodic double chains, Si4O11; Clinoamphiboles (09.DE)

Dana

Major class: silicates (VIII)
Class: inosilicate double-width unbranched chains, w=2 (66)
Type: with P=2 amphibole configuration (66.01)
Group: group 2, the calcic amphiboles (66.01.03a)

Phase type: crystalline

Crystallography

Crystal system: monoclinic
Crystal class: prismatic
Crystal class symbol: 2/m (C2h)
Crystal spacegroup: C2/m

Texture: monocrystalline

Optical properties

Refringence type: biaxial