Constituent
Name
Chlorites
Class
silicate mineral
Compound type
phyllosilicate
Comments
Group endmembers are: Donbassite, Cookeite, Sudoite, Clinochlore, Nimite, Baileychlore, Chamosite, Pennantite, Orthochamosite and Borocookeite - Crystal system: Monoclinic 2/m; with some triclinic polymorphs
Relevance
impurity
Arrangement
complex intimate mix
Mass fraction
0.002 $\pm$ 0.002
Abundance comments
Mass fraction uncertain (0.002 for < 2µm size - Vogt 2002)
Formula
$A_{5-6}T_4Z_{18}\ \ \ \ \ $ where $A = Al, Fe^{2+}, Fe^{3+}, Li, Mg, Mn $, and/or $Ni$,$\ \ \ T = Al, Fe^{3+}, Si,\ \ \ $ and $Z = O $ and $OH$
Chemical formula
(Al,Fe2+,Fe3+,Li,Mg,Mn,Ni,[])6(Al,Fe3+,Si)4(O,OH)18
Elemental formula
(Fe3+)0-0.5 (Fe2+)0-3 (Si)3-4 (Al)2-5.33 (Mn)0-1 (Li)0-2 (Ni)0-3 O18 (H)6-8 (Mg)1-4
Isotope mixture type
terrestrial abundance
  Formula Name Family Number min-max Isotope mole fraction State Relevance
$Al$ Aluminium element 2 - 5.33 constituent element main
$Fe^{2+}$ Iron(II) cation element 0 - 3 constituent element main
$Fe^{3+}$ Iron(III) cation element 0 - 0.5 constituent element main
$Li$ Lithium element 0 - 2 constituent element main
$Mg$ Magnesium element 1 - 4 constituent element main
$Mn$ Manganese element 0 - 1 constituent element main
$Ni$ Nickel element 0 - 3 constituent element main
$Si$ Silicon element 3 - 4 constituent element main
$O$ Oxygen element 18 constituent element main
$H$ Hydrogen element 6 - 8 constituent element main
Chemical functions
  Function Number
$\bullet (OH)^-$
Chemical bonds
  Bond Number
$H-O^-$ 1
Oxides
Formula $Al_{2}O_{3}$ $FeO$ $Fe_{2}O_{3}$ $Li_{2}O$ $MgO$ $MnO$ $NiO$ $SiO_{2}$ $H_{2}O$
Mass fraction (%)

Strunz

Class
silicates (09)
Division
phyllosilicate (09.E)
Family
Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets (09.EC)
Code
09.EC.55

Dana

Major class
silicates (VIII)
Class
phyllosilicate sheets of six-membered rings (71)
Type
interlayered 1:1, 2:1, and octahedra (71.04)
Group
Chlorite group (Tri-Dioctahedral) (71.04.01)
Phase type
crystalline
Crystal system
various
Crystal class
various
Crystal class symbol
various
Crystal spacegroup
various
Molar mass
502.73 - 709.44 $g/mol$
Density
2.62 - 3.4 $g/cm^3$
Refringence type
biaxial
Refringence sign
positif or negatif
Refraction index $n_{\alpha}$
1.57 - 1.67
Color
Various shades of green; rarely yellow, red, or white
Diaphaneity
transparent to subtranslucent
Luster
various