Constituent
Name
Glaucophane
IMA name
Sodium Amphibole Subgroup
Class
silicate mineral
Compound type
inosilicate
Comments
Mineral belonging to the sodic amphibole supergroup of the double chain inosilicates
Constituent abundance in material
Relevance
main - major
Arrangement
single phase
Mass fraction
1.0
Chemical composition
Formula
$(Na,K)_{0-1}Na_2((Mg^{2+},Fe^{2+},Mn^{2+},Li^+)_{5-m}(Al,Fe^{3+},Mn^{3+},Ti)_m)(Si_{8-(n+m)}Al_{(n+m)})O_{22}(OH,F,O)_2$ \ \ \ \ \ with m = 0, 1, 2
Chemical formula
(Na,K)0-1Na2(Mg,Fe,Mn,Li,Al,Ti)5(Si,Al)8O22(OH,F,O)2
Elemental formula
(Na+)2-3 (K+)0-1 (Mg2+)0-5 (Fe2+)0-5 (Mn2+)0-4 (Li+)0-1 (Al3+)0-3 (Fe3+)0-2 (Mn3+)0-3 (Ti4+)0-1 (Si)7-8 (O)22-24 (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
$Na^+$ Sodium cation element 2 - 3 constituent element main
$K^+$ Potassium(1+) 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
$Mn^{2+}$ Manganese(II) cation element 0 - 4 constituent element main
$Li^+$ Lithium cation element 0 - 1 constituent element main
$Al^{3+}$ Aluminium(III) cation element 0 - 3 constituent element main
$Fe^{3+}$ Iron(III) cation element 0 - 2 constituent element main
$Mn^{3+}$ Manganese(III) cation element 0 - 3 constituent element main
$Ti^{4+}$ Titanium(IV) cation element 0 - 1 constituent element main
$Si$ Silicon element 7 - 8 constituent element main
$O$ Oxygen element 22 - 24 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 ≤ 0,50 and Na ≥ 1,50 -- K+ (and Ba2+, Sr2+, Ca2+, Li+) can replace (Na+)n; Ca2+, Mg2+, Fe2+, Mn2+, Li+ (and Sr2+, Ba2+, Mn2+, Fe2+, Co2+, Ni2+, Zn2+, Mg2+, Pb2+, Cu, Zr, Mn3+, Cr3+, V, Fe3+) can partly replace Na+; Mn2+, Li+, Zn2+, Ni2+, Co2+, Fe3+, V, Cr3+, Mn3+, Zr can partly replace (Mg,Fe,Mn,Li,Al,Ti); Ti can partly replace (Si,Al), Cl, O can partly replace (OH,F)
Chemical functions
  Function Number
$(OH)^-$
Chemical bonds
  Bond Number
$O^--H$ 1
Oxides
Formula $Na_{2}O$ $K_{2}O$ $MgO$ $FeO$ $Fe_{2}O_{3}$ $MnO$ $Mn_{2}O_{3}$ $Li_{2}O$ $Al_{2}O_{3}$ $TiO_{2}$ $SiO_{2}$ $F$ $H_{2}O$
Mass fraction (%)

Strunz

Class
silicates (09)
Division
inosilicate (09.D)
Family
with 2-periodic double chains, Si4O11; amphibole family (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 4, the sodic amphiboles (66.01.03c)
Phase type
crystalline
Crystal system
monoclinic
Crystal class
prismatic
Crystal class symbol
2/m (C2h)
Crystal spacegroup
C2/m
Texture
monocrystalline
Refringence type
biaxial