Orthochamosite Mineral Data

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.

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:

OrthorhombicSpace 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

Diaphaniety:

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

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:

r_electron=3.10 gm/cc
note: r_{Orthochamosite}=3.15 gm/cc.

Fermion Index

Fermion Index = 0.01786
Boson Index = 0.98214

Photoelectric:

PE_{Orthochamosite}= 9.57 barns/electron
U=PE_{Orthochamosite} x r_electron= 29.69 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Orthochamosite is Not Radioactive

Orthochamosite Classification

Dana Class:

71.4.1.9 (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

Strunz Class:

VIII/H.23-40 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 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris

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Orthochamosite

(Fe++,Mg,Fe+++)5Al(Si3Al)O10(OH,O)8
Dana No: 71.4.1.9 Strunz No: VIII/H.23-40
Locality:

Notes: