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 % 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

Empirical Formula:

Fe²⁺₃Mg_1.5Fe³⁺_0.5Al₂Si₃O₁₂(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

Comments: Pale green micaceous orthochamosite in quartz.
Location: Near Manggruvan, Sweden. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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:

PE_{Orthochamosite}= 9.57 barns/electron
U=PE_{Orthochamosite} x rElectron 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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Print or Cut-and-Paste your Orthochamosite Specimen Label here :

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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