Chamosite Mineral Data

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General Chamosite Information
Help on Chemical Formula: Chemical Formula: (Fe++,Mg,Fe+++)5Al(Si3Al)O10(OH,O)8
Help on Composition: Composition: Molecular Weight = 664.18 gm
   Magnesium   5.49 %  Mg    9.10 % MgO
   Aluminum    8.12 %  Al   15.35 % Al2O3
   Iron       29.43 %  Fe   32.45 % FeO /  6.01 % Fe2O3
   Silicon    12.69 %  Si   27.14 % SiO2
   Hydrogen    0.91 %  H     8.14 % H2O
   Oxygen     43.36 %  O
             ______        ______ 
             100.00 %       98.19 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe2+3Mg1.5AlFe3+0.5Si3AlO12(OH)6
Help on Environment: Environment: Metamorphosed iron deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1820
Help on Locality: Locality: Chamoson, Rhone Valley, Switzerland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its locality.
Help on Synonym: Synonym: Brunsvigite
  Daphnite
  Delessite
  Thuringite (Fe)
 

Chamosite Image

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Chamosite

Comments: Dark green sectile massive chamosite.
Location: Jalgaon, Maharashtra, India. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Chamosite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.5773:1:1.5282
Help on Cell Dimensions: Cell Dimensions: a = 5.373, b = 9.306, c = 14.222, Z = 2; beta = 97.88° V = 704.40 Den(Calc)= 3.13
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.52(1), 7.05(1), 2.52(0.9),
Click Here for Large Chamosite Structure Window Crystal Structure:

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Walker J R , Bish D L , Clays and Clay Minerals , 40 (1992) p.319-322, Application of Rietveld refinement techniques to a disordered IIb Mg-chamosite, Locality: Lebanon, New Hampshire, USA

 

Physical Properties of Chamosite

Help on Cleavage: Cleavage: [001] Good
Help on Color: Color: Gray, Greenish gray, Brown, Blackish green.
Help on Density: Density: 3 - 3.4, Average = 3.2
Help on Diaphaniety: Diaphaniety: Translucent to subtranslucent
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Habit: Habit: Oolitic - < 3mm rounded spherical grains.
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Vitreous - Dull
Help on Streak: Streak: grayish green
 

Optical Properties of Chamosite

Help on Optical Data: Optical Data: Biaxial (-), a=1.6, b=1.6, g=1.67, bire=0.0700, 2V(Calc)=0, 2V(Meas)=0-15.
 

Calculated Properties of Chamosite

Help on Electron Density: Electron Density:

relectron=3.08 gm/cc
note: rChamosite =3.13 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.01786
Boson Index = 0.98214
Help on Photoelectric: Photoelectric:

PEChamosite = 9.57 barns/electron
U=PEChamosite x relectron= 29.50 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Chamosite is Not Radioactive
 

Chamosite Classification
Help on Dana Class: Dana Class: 71.4.1.7 (71)Phyllosilicate Sheets of Six-Membered Rings
  (71.4)interlayered 1:1, 2:1, and octahedra
  (71.4.1)Chlorite group (Tri-Dioctahedral)
 
71.4.1.1 Donbassite Al2[Al2.33][Si3AlO10](OH)8 C 2/m 2/m
 
71.4.1.2 Cookeite LiAl4(Si3Al)O10(OH)8 P 21/a 2/m
 
71.4.1.3 Sudoite Mg2(Al,Fe)3Si3AlO10(OH)8 C 2/m 2/m
 
71.4.1.4 Clinochlore (Mg,Fe)5Al(Si3Al)O10(OH)8 C 2/m 2/m
 
71.4.1.5 Nimite (Ni,Mg,Fe)5Al(Si3Al)O10(OH)8 C 2/m 2/m
 
71.4.1.6 Baileychlore (Zn,Al,[])3[Fe2Al][Si3AlO10](OH)8 C1,C1 Tri
 
71.4.1.7 Chamosite (Fe,Mg,Fe)5Al(Si3Al)O10(OH,O)8 C 2/m 2/m
 
71.4.1.8 Pennantite Mn5Al(Si3Al)O10(OH)8 C 2/m 2/m
 
71.4.1.9 Orthochamosite! (Fe,Mg,Fe)5Al(Si3Al)O10(OH,O)8 C3m-pseudoHEX Ortho
 
71.4.1.10 Borocookeite! Li(13x)Al(4-x)(BSi3)O10(OH,F)8[x=0-0.33] pseudo C 2/m 2/m
Help on Strunz Class: Strunz Class: VIII/H.23-30 VIII - Silicates
  VIII/H - Phyllosilicates (layered) Mica like with [Si4O10]4- and related groups
  VIII/H.23 - Chlorite group
 
VIII/H.23-10 Sudoite Mg2(Al,Fe)3Si3AlO10(OH)8 C 2/m 2/m
 
VIII/H.23-20 Clinochlore (Mg,Fe)5Al(Si3Al)O10(OH)8 C 2/m 2/m
 
VIII/H.23-30 Chamosite (Fe,Mg,Fe)5Al(Si3Al)O10(OH,O)8 C 2/m 2/m
 
VIII/H.23-40 Orthochamosite (Fe,Mg,Fe)5Al(Si3Al)O10(OH,O)8 C3m-pseudoHEX Ortho
 
VIII/H.23-50 Baileychlore (Zn,Al,[])3[Fe2Al][Si3AlO10](OH)8 C1,C1 Tri
 
VIII/H.23-60 Pennantite Mn5Al(Si3Al)O10(OH)8 C 2/m 2/m
 
VIII/H.23-70 Nimite (Ni,Mg,Fe)5Al(Si3Al)O10(OH)8 C 2/m 2/m
 
VIII/H.23-80 Gonyerite Mn3[Mn3Fe][(Si,Fe)4O10](OH,O)8 pseudo-HEX Ortho
 
VIII/H.23-90 Cookeite LiAl4(Si3Al)O10(OH)8 P 21/a 2/m
 
VIII/H.23-95 Borocookeite! Li(13x)Al(4-x)(BSi3)O10(OH,F)8[x=0-0.33] pseudo C 2/m 2/m
 
VIII/H.23-100 Manandonite Li2Al4[(Si2AlB)O10](OH)8 C1 1
 
VIII/H.23-110 Franklinfurnaceite Ca2(Fe,Al)MnMn3Zn2Si2O10(OH)8 C 2 2
 

Other Chamosite Information
Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Chamosite :
1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 -Athena 5 - Crocoite.com Mineral Locations 6 - EUROmin Project 7 - Franklin Minerals(Dunn) 8 -Google Images 9 -Google Scholar 10 -Handbook of Mineralogy (MinSocAm) 11 -Handbook of Mineralogy (UofA) 12 -MinDAT 13 -MinMax(Deutsch) 14 -MinMax(English) 15 -Mineralienatlas (Deutsch) 16 - Minerals of Wisconsin 17 -QUT Mineral Atlas 18 -École des Mines de Paris

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Chamosite

(Fe++,Mg,Fe+++)5Al(Si3Al)O10(OH,O)8
Dana No: 71.4.1.7 Strunz No: VIII/H.23-30
Locality:

 

Notes:

 
 
   
 
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