Mineral phase
IMA name
Amesite subgroup
Type
Class
silicate mineral
Compound type
phyllosilicate
Chemical composition
Formula
$(Fe^{2+},Fe^{3+},Mn^{2+},Mg,Ni,Al,Zn,Li)_{2-3}(Si,Al,Fe^{3+},B)_2O_5(OH)_4$
Chemical formula
(Fe2+,Fe3+,Mn2+,Mg,Ni,Al,Zn,Li)2-3(Si,Al,Fe3+,B)2O5(OH)4
Elemental formula
(Fe2+)0-2 (Fe3+)0-2 (Mn2+)0-2 (Mg)0-2 (Al)0-3 (Zn)0-3 (Li)0-2 (Ni)0-2 (B)0-0.5 (Si)1-2 O9 H4
Isotope mixture type
terrestrial abundance
  Formula Name Family Number min-max Isotope mole fraction State Relevance
$Fe^{2+}$ Iron(II) cation element 0 - 2 constituent element main
$Fe^{3+}$ Iron(III) cation element 0 - 2 constituent element main
$Mn^{2+}$ Manganese(II) cation element 0 - 2 constituent element main
$Mg$ Magnesium element 0 - 2 constituent element main
$Al$ Aluminium element 0 - 3 constituent element main
$Zn$ Zinc element 0 - 3 constituent element main
$Li$ Lithium element 0 - 2 constituent element main
$Ni$ Nickel element 0 - 2 constituent element main
$B$ Boron element 0 - 0.5 constituent element main
$Si$ Silicon element 1 - 2 constituent element main
$O$ Oxygen element 9 constituent element main
$H$ Hydrogen element 4 constituent element main
Composition comments
Common impurities: Ti, Ca
Chemical functions
  Function Number
$(OH)^-$ 4
Chemical bonds
  Bond Number
$O^--H$ 1
Oxides
Formula $FeO$ $Fe_{2}O_{3}$ $MnO$ $MgO$ $NiO$ $ZnO$ $Li_{2}O$ $B_{2}O_{3}$ $Al_{2}O_{3}$ $SiO_{2}$ $H_{2}O$
Mass fraction (%)

Strunz

Class
silicates (09)
Division
phyllosilicate (09.E)
Family
Phyllosilicates with kaolinite layers (09.ED)
Code
09.ED.15

Dana

Major class
silicates (VIII)
Class
phyllosilicate sheets of six-membered rings (71)
Type
with 1:1 layers (71.01)
Group
Serpentine group (Amesite subgroup) (71.01.02c)
End-members
Phase type
crystalline
Crystal system
various
Crystal class
various
Crystal class symbol
various
Crystal spacegroup
various
Molar mass
278.68 - 399.5 $g/mol$
Density
2.77 - 3.54 $g/cm^3$
State NTP
solid
Refringence type
various
Refringence sign
positive or negative
Pure color
various
Color
white, brown green, light green, dark green, green yellow, reddish brown, greenish brown, black, yellowish white, lemon yellow, colorless
Diaphaneity
various
Links