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Chamosite

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Formula:
(Fe2+,Mg,Al,Fe3+)6(Si,Al)4O10(OH,O)8
Colour:
Green, grey-green, black
Hardness:
3
Crystal System:
Monoclinic
Member of:
Name:
Named in 1820 by Pierre Berthier for the type locality Haut de Cry, near Chamoson, Valais, Switzerland
The iron(II) analogue of clinochlore, with which it forms a solid-solution series. A fairly common member of the chlorite group.


Classification of Chamosite

Approved, 'Grandfathered' (first described prior to 1959)
9.EC.55

9 : SILICATES (Germanates)
E : Phyllosilicates
C : Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets
71.4.1.7

71 : PHYLLOSILICATES Sheets of Six-Membered Rings
4 : Sheets of 6-membered rings interlayered 1:1, 2:1, and octahedra
16.19.13

16 : Silicates Containing Aluminum and other Metals
19 : Aluminosilicates of Fe and Mg

Physical Properties of Chamosite

Colour:
Green, grey-green, black
Hardness:

Optical Data of Chamosite

Type:
Biaxial (-)
RI values:
nα = 1.600 nβ = 1.600 nγ = 1.670
Max Birefringence:
δ = 0.070
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r < v weak

Chemical Properties of Chamosite

Formula:
(Fe2+,Mg,Al,Fe3+)6(Si,Al)4O10(OH,O)8
Common Impurities:
Mn,Ca,Na,K

Crystallography of Chamosite

Polytype:
Formula:
Crystal System:
Class (H-M)
Space Group:
Space Group Setting:
Cell Parameters:
Ratio:
Unit Cell Volume (calc):
Z:
Orthochamosite
(Fe2+,Mg,Fe3+)5Al(AlSi3O10)(OH,O)8
 
 
 
 
a = 5.35 Å, c = 9.29 Å
a:c = 1 : 1.736
 
 

X-Ray Powder Diffraction

Powder Diffraction Data:
d-spacingIntensity
14.1 (70)
7.05 (100)
3.52 (100)
2.601 (90)
2.554 (70)
2.392 (80)
1.551 (90)

Type Occurrence of Chamosite

Other Language Names for Chamosite

German:Chamosit
Simplified Chinese:鲕绿泥石
Spanish:Chamosita

Varieties of Chamosite

Bavalite

Chlorite group.
Originally reported from Brittany, France.

Corundophilite

Daphnite

A magnesian variety of chamosite.
Originally reported from Penzance - Ludgvan Area, Mount's Bay District, Cornwall, England, UK.

Pseudothuringite

An aluminous variety of chamosite

Thuringite

A ferroan variety of Chamosite, first reported from Reichmannsdorf, Thuringian Forest, Thuringia, Germany.

Chlorite Group.

Relationship of Chamosite to other Species

Member of:
Other Members of this group:
Baileychlore(Zn,Fe2+,Al,Mg)6(Si,Al)4O10(OH)8
BorocookeiteLi1+3xAl4-x(BSi3O10)(OH)8
ClinochloreMg5Al(AlSi3O10)(OH)8
Cookeite(Al2Li)Al2(AlSi3O10)(OH)8
DonbassiteAl4.33(AlSi3O10)(OH)8
FranklinfurnaceiteCa2Fe3+Mn2+3Mn3+(Zn2Si2O10)(OH)8
GlagoleviteNa(Mg,Al)6(AlSi3O10)(OH,O)8
Gonyerite(Mn2+,Mg)5Fe3+(Fe3+Si3O10)(OH)8
Nimite(Ni,Mg,Al)6((Si,Al)4O10)(OH)8
Orthochamosite(Fe2+,Mg,Fe3+)5Al(AlSi3O10)(OH,O)8
PennantiteMn2+5Al(AlSi3O10)(OH)8
SudoiteMg2Al3(Si3Al)O10)(OH)8
Forms a series with:

Common Associates

Associated Minerals Based on Photo Data:
Quartz43 photos of Chamosite associated with Quartz on mindat.org.
Pyrite18 photos of Chamosite associated with Pyrite on mindat.org.
Fluorite14 photos of Chamosite associated with Fluorite on mindat.org.
Titanite10 photos of Chamosite associated with Titanite on mindat.org.
Hematite10 photos of Chamosite associated with Hematite on mindat.org.
Albite10 photos of Chamosite associated with Albite on mindat.org.
Almandine10 photos of Chamosite associated with Almandine on mindat.org.
Epidote10 photos of Chamosite associated with Epidote on mindat.org.
Calcite9 photos of Chamosite associated with Calcite on mindat.org.
Smoky Quartz7 photos of Chamosite associated with Smoky Quartz on mindat.org.

Related Minerals - Nickel-Strunz Grouping

9.EC.05MinnesotaiteFe2+3Si4O10(OH)2
9.EC.05TalcMg3Si4O10(OH)2
9.EC.05WillemseiteNi3Si4O10(OH)2
9.EC.10FerripyrophylliteFe3+Si2O5(OH)
9.EC.10PyrophylliteAl2Si4O10(OH)2
9.EC.15BoromuscoviteKAl2(BSi3O10)(OH)2
9.EC.15CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
9.EC.15Chernykhite(Ba,Na)(V3+,Al,Mg)2((Si,Al)4O10)(OH)2
9.EC.15Montdorite(K,Na)2(Fe2+,Mn2+,Mg)5(Si4O10)2(OH,F)4
9.EC.15MuscoviteKAl2(AlSi3O10)(OH)2
9.EC.15NanpingiteCsAl2(AlSi3O10)(OH,F)2
9.EC.15ParagoniteNaAl2(AlSi3O10)(OH)2
9.EC.15RoscoeliteK(V3+,Al)2(AlSi3O10)(OH)2
9.EC.15Tobelite(NH4,K)Al2(AlSi3O10)(OH)2
9.EC.15AluminoceladoniteK(Mg,Fe2+)Al(Si4O10)(OH)2
9.EC.15ChromphylliteK(Cr,Al)2(AlSi3O10)(OH,F)2
9.EC.15FerroaluminoceladoniteK(Fe2+,Mg)(Al,Fe3+)(Si4O10)(OH)2
9.EC.15FerroceladoniteK(Fe2+,Mg)(Fe3+,Al)(Si4O10)(OH)2
9.EC.15ChromceladoniteK(Mg,Fe2+)(Cr,Al)(Si4O10)(OH)2
9.EC.15TainioliteKLiMg2(Si4O10)F2
9.EC.15Ganterite(Ba,Na,K)(Al,Mg)2(AlSi3O10)(OH)2
9.EC.20AnniteKFe2+3(AlSi3O10)(OH)2
9.EC.20EphesiteLiNaAl2(Al2Si2O10)(OH)2
9.EC.20HendricksiteK(Zn,Mg,Mn2+)3(AlSi3O10)(OH)2
9.EC.20Masutomilite(K,Rb)(Li,Mn3+,Al)3(AlSi3O10)(F,OH)2
9.EC.20NorrishiteKLiMn3+2(Si4O10)O2
9.EC.20PhlogopiteKMg3(AlSi3O10)(OH)2
9.EC.20PolylithioniteKLi2Al(Si4O10)(F,OH)2
9.EC.20PreiswerkiteNaMg2Al(Al2Si2O10)(OH)2
9.EC.20SiderophylliteKFe2+2Al(Al2Si2O10)(OH)2
9.EC.20TetraferriphlogopiteKMg3(Fe3+Si3O10)(OH,F)2
9.EC.20FluorotetraferriphlogopiteKMg3(Fe3+Si3O10)F2
9.EC.20Wonesite(Na,K)(Mg,Fe,Al)6((Al,Si)4O10)2(OH,F)4
9.EC.20EastoniteKMg2Al(Al2Si2O10)(OH)2
9.EC.20TetraferrianniteKFe2+3((Fe3+,Al)Si3O10)(OH)2
9.EC.20TrilithioniteK(Li1.5Al1.5)(AlSi3O10)(F,OH)2
9.EC.20FluoranniteKFe2+3(AlSi3O10)(F,OH)2
9.EC.20ShirokshiniteKNaMg2(Si4O10)F2
9.EC.20ShirozuliteK(Mn2+,Mg)3(AlSi3O10)(OH)2
9.EC.20SokolovaiteCsLi2Al(Si4O10)F2
9.EC.20AspidoliteNaMg3(AlSi3O10)(OH)2
9.EC.20FluorophlogopiteKMg3(AlSi3O10)(F,OH)2
9.EC.20UM2004-49-SiO:AlCsFHKLi(Cs,K)(Al,Li)2.6((Si,Al)4O10)(F,OH)2
9.EC.20Suhailite(NH4)Fe2+3(AlSi3O10)(OH)2
9.EC.20YangzhumingiteKMg2.5(Si4O10)F2
9.EC.20OrloviteKLi2Ti(Si4O10)OF
9.EC.20OxyphlogopiteK(Mg,Ti,Fe)3[(Si,Al)4O10](O,F)2
9.EC.25Brammallite(Na,H3O)(Al,Mg,Fe)2((Si,Al)4O10)(OH)2
9.EC.30MargariteCaAl2(Al2Si2O10)(OH)2
9.EC.35Anandite(Ba,K)(Fe2+,Mg)3((Si,Al,Fe)4O10)(S,OH)2
9.EC.35BityiteLiCaAl2(AlBeSi2O10)(OH)2
9.EC.35ClintoniteCa(Mg,Al)3(Al3SiO10)(OH)2
9.EC.35Kinoshitalite(Ba,K)(Mg,Mn2+,Al)3(Al2Si2O10)(OH)2
9.EC.35Ferrokinoshitalite(Ba,K)(Fe2+,Mg)3(Al2Si2O10)(OH,F)2
9.EC.35Oxykinoshitalite(Ba,K)(Mg,Ti,Fe3+,Fe2+)3((Si,Al)4O10)(O,OH,F)2
9.EC.35FluorokinoshitaliteBaMg3(Al2Si2O10)F2
9.EC.40Beidellite(Na,Ca0.5)0.3Al2((Si,Al)4O10)(OH)2 · nH2O
9.EC.40Kurumsakite(Zn,Ni,Cu)8Al8V5+2Si5O35 · 27H2O (?)
9.EC.40Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
9.EC.40NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
9.EC.40VolkonskoiteCa0.3(Cr,Mg,Fe)2((Si,Al)4O10)(OH)2 · 4H2O
9.EC.40Yakhontovite(Ca,Na)0.5(Cu,Fe,Mg)2(Si4O10)(OH)2 · 3H2O
9.EC.45HectoriteNa0.3(Mg,Li)3(Si4O10)(F,OH)2
9.EC.45SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
9.EC.45SauconiteNa0.3Zn3((Si,Al)4O10)(OH)2 · 4H2O
9.EC.45SpadaiteMgSiO2(OH)2 · H2O (?)
9.EC.45Stevensite(Ca,Na)xMg3-x(Si4O10)(OH)2
9.EC.45SwineforditeLi(Al,Li,Mg)4((Si,Al)4O10)2(OH,F)4 · nH2O
9.EC.45ZincsiliteZn3(Si4O10)(OH)2 · 4H2O
9.EC.45FerrosaponiteCa0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 · 4H2O
9.EC.50VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
9.EC.55Baileychlore(Zn,Fe2+,Al,Mg)6(Si,Al)4O10(OH)8
9.EC.55ClinochloreMg5Al(AlSi3O10)(OH)8
9.EC.55Cookeite(Al2Li)Al2(AlSi3O10)(OH)8
9.EC.55FranklinfurnaceiteCa2Fe3+Mn2+3Mn3+(Zn2Si2O10)(OH)8
9.EC.55Gonyerite(Mn2+,Mg)5Fe3+(Fe3+Si3O10)(OH)8
9.EC.55Nimite(Ni,Mg,Al)6((Si,Al)4O10)(OH)8
9.EC.55Orthochamosite(Fe2+,Mg,Fe3+)5Al(AlSi3O10)(OH,O)8
9.EC.55PennantiteMn2+5Al(AlSi3O10)(OH)8
9.EC.55SudoiteMg2Al3(Si3Al)O10)(OH)8
9.EC.55DonbassiteAl4.33(AlSi3O10)(OH)8
9.EC.55GlagoleviteNa(Mg,Al)6(AlSi3O10)(OH,O)8
9.EC.55BorocookeiteLi1+3xAl4-x(BSi3O10)(OH)8
9.EC.60AliettiteCa0.2Mg6((Si,Al)8O20)(OH)4 · 4H2O
9.EC.60Corrensite(Mg,Fe)9((Si,Al)8O20)(OH)10 · nH2O
9.EC.60DozyiteMg7Al2(Al2Si4O15)(OH)12
9.EC.60HydrobiotiteK(Mg,Fe2+)6((Si,Al)8O20)(OH)4 · nH2O
9.EC.60Karpinskite(Ni,Mg)2Si2O5(OH)2 (?)
9.EC.60KulkeiteMg8Al(AlSi7O20)(OH)10
9.EC.60LunijianlaiteLi0.7Al6.2(AlSi7O20)(OH,O)10
9.EC.60Rectorite(Na,Ca)Al4((Si,Al)8O20)(OH)4 · 2H2O
9.EC.60Saliotite(Li,Na)Al3(AlSi3O10)(OH)5
9.EC.60TosuditeNa0.5(Al,Mg)6((Si,Al)8O18)(OH)12 · 5H2O
9.EC.60BrinrobertsiteNa0.3Al4(Si4O10)2(OH)4 · 3.5 H2O
9.EC.65Macaulayite(Fe,Al)24Si4O43(OH)2
9.EC.70BurckhardtitePb2(Fe3+Te6+)[AlSi3O8]O6
9.EC.75Ferrisurite(Pb,Ca)2.4Fe3+2(Si4O10)(CO3)1.7(OH)3 · nH2O
9.EC.75Surite(Pb,Ca)3(Al,Fe2+,Mg)2((Si,Al)4O10)(CO3)2(OH)2
9.EC.75Niksergievite(Ba,Ca)2Al3(AlSi3O10)(CO3)(OH)6 · nH2O
9.EC.80KegelitePb8Al4(Si8O20)(SO4)2(CO3)4(OH)8

Related Minerals - Hey's Chemical Index of Minerals Grouping

16.19.1IndialiteMg2Al3(AlSi5O18)
16.19.2Cordierite(Mg,Fe)2Al3(AlSi5O18)
16.19.3Sekaninaite(Fe,Mg)2Al3(AlSi5O18)
16.19.4Ferro-gedrite☐{Fe2+2}{Fe2+3Al2}(Al2Si6O22)(OH)2
16.19.5StauroliteFe2+2Al9Si4O23(OH)
16.19.6Chloritoid(Fe2+,Mg,Mn2+)Al2(SiO4)O(OH)2
16.19.7AmesiteMg2Al(AlSiO5)(OH)4
16.19.8Corundophilite(Mg,Fe,Al)6(Si,Al)4O10(OH)8
16.19.9YoderiteMg(Al,Fe3+)3(SiO4)2O(OH)
16.19.10Delessite(Mg,Fe,Fe,Al)(Si,Al)4O10(O,OH)8
16.19.11Ferrocarpholite(Fe2+,Mg)Al2(Si2O6)(OH)4
16.19.12Magnesiocarpholite(Mg,Fe2+)Al2(Si2O6)(OH)4
16.19.14Orthochamosite(Fe2+,Mg,Fe3+)5Al(AlSi3O10)(OH,O)8
16.19.15Berthierine(Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4
16.19.16Odinite(Fe,Mg,Al,Fe,Ti,Mn)2.4((Si,Al)2O5)(OH)4
16.19.17ClinochloreMg5Al(AlSi3O10)(OH)8
16.19.18Gedrite☐{Mg2}{Mg3Al2}(Al2Si6O22)(OH)2
16.19.19Magnesiogedrite☐{Mg2}{Mg3Al2}(Al2Si6O22)(OH)2
16.19.20Diabantite(Mg,Fe,Al)6((Si,Al)4O10)(OH)8
16.19.21SudoiteMg2Al3(Si3Al)O10)(OH)8
16.19.22VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
16.19.23Corrensite(Mg,Fe)9((Si,Al)8O20)(OH)10 · nH2O

Related Minerals - Dana Grouping (8th Ed.)

71.4.1.1DonbassiteAl4.33(AlSi3O10)(OH)8
71.4.1.2Cookeite(Al2Li)Al2(AlSi3O10)(OH)8
71.4.1.3SudoiteMg2Al3(Si3Al)O10)(OH)8
71.4.1.4ClinochloreMg5Al(AlSi3O10)(OH)8
71.4.1.5Nimite(Ni,Mg,Al)6((Si,Al)4O10)(OH)8
71.4.1.6Baileychlore(Zn,Fe2+,Al,Mg)6(Si,Al)4O10(OH)8
71.4.1.8PennantiteMn2+5Al(AlSi3O10)(OH)8

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Chamosite

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Brindley, G. W. (1949): Mineralogy and crystal structure of chamosite. Nature 164 319-320.
Brindley, G. W. (1951): The crystal structure of some chamosite minerals. Mineralogical Magazine 29, 502-522.
Brindley, G. W. & Youell, R. F. (1953): Ferrous chamosite and ferric chamosite. Mineralogical Magazine 30, 57-70.
Youell, R. F. (1955): Mineralogy and crystal structure of chamosite. Nature 176, 560-561.
Delaloye, M. (1962): Chamosite of Chamoson, Valais. Schweizerische Mineralogische und Petrographische Mitteilungen 42, 644.
Ershova, K. S.; Solntseva, L. S.; Umnova, E. G.; Shcherbak, O. V.; Dubakina, L. S. (1980): Complex study of the composition and properties of chamosite. Rentgenografiya Mineral'n. Syr'ya i ee Prikl. Znachenie, M. 165-179.
Whittle, C. K. (1986): Comparison of sedimentary chlorite compositions by x-ray diffraction and analytical TEM. Clay Minerals 21, 937-947.
Walker, J. R. & Bish, D. L. (1992): Application of Rietveld refinement techniques to a disordered IIb magnesian chamosite. Clays and Clay Minerals 40, 319-322.
De Caritat, P., Hutcheon, I. & Walshe, J.E. (1993): Chlorite geothermometry: a review. Clays and Clay Minerals, 41, 219-239.
Mohapatra, B. K.; Rath, P. C.; Sahoo, R. K. (1995): Chromiferous chamosite from Pokphur magnetite body, Nagaland, India. Current Science 68, 1036-1039.
Wiewiora, Andrzej; Wilamowski, Andrzej; Lacka, Bozena; Kuzniarski, Michal; Grabska, Dorota (1998): Chamosite from oolitic ironstones: the necessity of a combined XRD-EDX approach. Canadian Mineralogist 36, 1547-1557.
Vasileva, R. D. & Bonev, I. K. (2002): Hydrothermal manganoan chamosite from the vein and replacement Pb-Zn ore deposits, Madan district, Bulgaria. Geokhimiya, Mineralogiya i Petrologiya 39, 81-93.

Internet Links for Chamosite

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https://www.mindat.org/min-967.html
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Specimens:
The following Chamosite specimens are currently listed for sale on minfind.com.

Localities for Chamosite

Mineral and/or Locality  
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