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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 - Prismatic H-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),
 

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 Diaphaneity: Diaphaneity: 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 Gladstone-Dale: Gladstone-Dale: CI meas= 0.09 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.07 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1991,KPDmeas= 0.1948,KC= 0.214
Ncalc = 1.64 - 1.73
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: Bulk Density (Electron Density)=3.08 gm/cc
note: Specific Gravity of Chamosite =3.13 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEChamosite = 9.57 barns/electron
U=PEChamosite x rElectron Density= 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: 71.04.01.07 (71)Phyllosilicate Sheets of Six-Membered Rings
  (71.04)interlayered 1:1, 2:1, and octahedra
  (71.04.01)Chlorite group (Tri-Dioctahedral)
 
71.04.01.01 Donbassite Al2[Al2.33][Si3AlO10](OH)8 C 2/m 2/m
 
71.04.01.02 Cookeite LiAl4(Si3Al)O10(OH)8 P 21/a 2/m
 
71.04.01.03 Sudoite Mg2(Al,Fe)3Si3AlO10(OH)8 C 2/m 2/m
 
71.04.01.04 Clinochlore (Mg,Fe)5Al(Si3Al)O10(OH)8 C 2/m 2/m
 
71.04.01.05 Nimite (Ni,Mg,Fe)5Al(Si3Al)O10(OH)8 C 2/m 2/m
 
71.04.01.06 Baileychlore (Zn,Al,[])3[Fe2Al][Si3AlO10](OH)8 C1,C1 Tri
 
71.04.01.07 Chamosite (Fe,Mg,Fe)5Al(Si3Al)O10(OH,O)8 C 2/m 2/m
 
71.04.01.08 Pennantite Mn5Al(Si3Al)O10(OH)8 C 2/m 2/m
 
71.04.01.09 Orthochamosite! (Fe,Mg,Fe)5Al(Si3Al)O10(OH,O)8 C3m-pseudoHEX Ortho
 
71.04.01.10 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: 09.EC.55 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EC -Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets
 
09.EC.55 Donbassite Al2[Al2.33][Si3AlO10](OH)8 C 2/m 2/m
 
09.EC.55 Baileychlore (Zn,Al,[])3[Fe2Al][Si3AlO10](OH)8 C1,C1 Tri
 
09.EC.55 Clinochlore (Mg,Fe)5Al(Si3Al)O10(OH)8 C 2/m 2/m
 
09.EC.55 Cookeite LiAl4(Si3Al)O10(OH)8 P 21/a 2/m
 
09.EC.55 Chamosite (Fe,Mg,Fe)5Al(Si3Al)O10(OH,O)8 C 2/m 2/m
 
09.EC.55 Franklinfurnaceite Ca2(Fe,Al)MnMn3Zn2Si2O10(OH)8 C 2 2
 
09.EC.55 Nimite (Ni,Mg,Fe)5Al(Si3Al)O10(OH)8 C 2/m 2/m
 
09.EC.55 Gonyerite Mn3[Mn3Fe][(Si,Fe)4O10](OH,O)8 pseudo-HEX Ortho
 
09.EC.55 Odinite (Fe,Mg,Al,Fe,Ti,Mn)2.5(Si,Al)2O5(OH)4 Cm m
 
09.EC.55 Orthochamosite (Fe,Mg,Fe)5Al(Si3Al)O10(OH,O)8 C3m-pseudoHEX Ortho
 
09.EC.55 Pennantite Mn5Al(Si3Al)O10(OH)8 C 2/m 2/m
 
09.EC.55 Sudoite Mg2(Al,Fe)3Si3AlO10(OH)8 C 2/m 2/m
 
09.EC.55 Glagolevite! NaMg6[Si3AlO10](OH,O)8•H2O C1 1
 
09.EC.55 Borocookeite! Li(13x)Al(4-x)(BSi3)O10(OH,F)8[x=0-0.33] pseudo C 2/m 2/m
 

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 - EUROmin Project
6 - Ecole des Mines de Paris
7 - Franklin Minerals(Dunn)
8 - GeoScienceWorld
9 - Google Images
10 - Google Scholar
11 - Handbook of Mineralogy (MinSocAm)
12 - Handbook of Mineralogy (UofA)
13 - MinDAT
14 - Mineral and Gemstone Kingdom
15 - Mineralienatlas (Deutsch)
16 - Online Mineral Museum
17 - QUT Mineral Atlas
18 - Ruff.Info

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Print or Cut-and-Paste your Chamosite Specimen Label here :

Chamosite

(Fe++,Mg,Fe+++)5Al(Si3Al)O10(OH,O)8
Dana No: 71.04.01.07 Strunz No: 09.EC.55
Locality:

 

Notes:

 

 
   
 


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