Orthochamosite Mineral Data

[Mineral Forums] [Minerals for Sale] [About Us] [En Espanol] [Mineral Gallery]
Fabre Minerals - Europe's first Internet mineral dealer, on the web since 1996

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:

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

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 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info

Search for Orthochamosite using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Orthochamosite :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Desert Winds Gems and Minerals

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Orthochamosite Mineral Data :

Ask about Orthochamosite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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:

Notes: