Orthochamosite Mineral Data
General Orthochamosite Information
Chemical Formula:
(Fe++,Mg,Fe+++)5Al(Si3Al)O10(OH,O)8
Composition:
Molecular Weight = 664.18 gm
Magnesium 5.49 % Mg 9.10 % MgO
Aluminum 8.12 % Al 15.35 % Al2 O3
Iron 29.43 % Fe 32.45 % FeO / 6.01 % Fe2 O3
Silicon 12.69 % Si 27.14 % SiO2
Hydrogen 0.91 % H 8.14 % H2 O
Oxygen 43.36 % O
______ ______
100.00 % 98.19 % = TOTAL OXIDE
Empirical Formula:
Fe2+ 3 Mg1.5 Fe3+ 0.5 Al2 Si3 O12 (OH)6
Environment:
In a lateritic clay derived from the alteration of olivine basalts (Ayrshire, Scotland).
IMA Status:
Valid Species (Pre-IMA) 1957 (Dana # Added)
Locality:
Kank, Kutna Hora, Stredocesky kraj, Cechy (Bohemia), Czech Republic. Link to MinDat.org Location Data.
Name Origin:
Named as the orthorhombic analogue of chamosite.
Name Pronunciation:
Orthochamosite + Pronunciation
Orthochamosite Image
Images:
Orthochamosite Crystallography
Axial Ratios:
a:b:c =0.5762:1:0.7578
Cell Dimensions:
a = 5.355, b = 9.293, c = 7.043, Z = 1; V = 350.49 Den(Calc)= 3.15
Crystal System:
Orthorhombic Space Group: C3m-pseudoHEX
X Ray Diffraction:
By Intensity(I/Io ): 3.513(1), 7.04(1), 2.514(0.9), 1.552(0.7), 2.137(0.6), 1.765(0.4), 2.673(0.4),
Physical Properties of Orthochamosite
Cleavage:
{001} Perfect
Color:
Green, Greenish gray.
Density:
3.1 - 3.15, Average = 3.12
Diaphaneity:
Translucent
Fracture:
Micaceous - Fracture of flexable micaceous cleavage fragments.
Habit:
Massive - Lamellar - Distinctly foliated fine-grained forms.
Habit:
Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Hardness:
2 - Gypsum
Luster:
Pearly
Streak:
greenish white
Optical Properties of Orthochamosite
Gladstone-Dale:
CI meas = 0.068 (Fair) - where the CI = (1-KPDmeas /KC ) CI calc = 0.075 (Fair) - where the CI = (1-KPDcalc /KC )
KPDcalc = 0.1979,KPDmeas = 0.1995,KC = 0.214 Ncalc = 1.66 - 1.67
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 Orthochamosite
Electron Density:
Bulk Density (Electron Density)=3.08 gm/cc note: Specific Gravity of Orthochamosite =3.13 gm/cc.
Fermion Index:
Fermion Index = 0.01 Boson Index = 0.99
Photoelectric:
PEOrthochamosite = 9.57 barns/electronU=PEOrthochamosite x r Electron Density= 29.45 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Orthochamosite is Not Radioactive
Orthochamosite Classification
Dana Class:
71.04.01.09 (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
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 Orthochamosite Information
References:
NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
See Also:
Links to other databases for Orthochamosite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
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Orthochamosite
(Fe++,Mg,Fe+++)5Al(Si3Al)O10(OH,O)8
Dana No: 71.04.01.09 Strunz No: 09.EC.55
Locality:
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