Carboirite-VIII Mineral Data

General Carboirite-VIII Information

Chemical Formula: Fe++(Al,Ge)2 O[(Ge,Si)O4](OH)2 Composition: Molecular Weight = 292.20 gm    Aluminum   16.62 %  Al   31.40 % Al₂O₃    Iron       19.11 %  Fe   24.59 % FeO    Silicon     2.88 %  Si    6.17 % SiO₂    Germanium  22.36 %  Ge   32.22 % GeO₂    Hydrogen    0.69 %  H     6.17 % H₂O    Oxygen     38.33 %  O              ______        ______               100.00 %      100.55 % = TOTAL OXIDE Empirical Formula: Fe²⁺Al_1.8Ge_0.2O(GeO4)_0.7(SiO₄)_0.3(OH)₂ Environment: Found in sphalerite associated with Ge-bearing quartz. IMA Status: Approved IMA 1983 Locality: Carboire, Ariege, central Pyrenees, France. Link to MinDat.org Location Data. Name Origin: Named for the locality.  

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Carboirite-VIII Crystallography

Axial Ratios: a:b:c =1.7082:1:1.6692 Cell Dimensions: a = 9.513, b = 5.569, c = 9.296, Z = 4; alpha = 96.08°, beta = 101.52°, gamma = 89.45° V = 479.82 Den(Calc)= 4.04 Crystal System: Triclinic - PinacoidalH-M Symbol ( 1) Space Group: C1 X Ray Diffraction: By Intensity(I/I_o): 4.528(1), 2.48(0.9), 2.728(0.9),  

Physical Properties of Carboirite-VIII

Cleavage: {001} Perfect Color: Green. Habit: Platy - Sheet forms (e.g. micas). Habit: Pseudo Hexagonal - Crystals show a hexagonal outline. Hardness: 6 - Orthoclase Luster: Vitreous (Glassy)  

Optical Properties of Carboirite-VIII

Gladstone-Dale: CI calc= 0.085 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.182,KC= 0.1988
Ncalc = 1.8 Optical Data: Biaxial (+), a=1.731, b=1.735, g=1.74, bire=0.0090, 2V(Calc)=84, 2V(Meas)=7. Dispersion r > v strong.  

Calculated Properties of Carboirite-VIII

Electron Density: Bulk Density (Electron Density)=3.88 gm/cc
note: Specific Gravity of Carboirite-VIII =4.04 gm/cc.
Fermion Index: Fermion Index = 0.02
Boson Index = 0.98 Photoelectric: PE_{Carboirite-VIII} = 19.89 barns/electron
U=PE_{Carboirite-VIII} x rElectron Density= 77.24 barns/cc.
Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Carboirite-VIII is Not Radioactive  

Carboirite-VIII Classification

Dana Class: 52.03.03.04 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O   (52.03)with cations in [6] coordination only   (52.03.03)Chloritoid group  

52.03.03.01 Chloritoid (Fe,Mg,Mn)2Al4Si2O10(OH)4 P1 1

 

52.03.03.02 Magnesiochloritoid MgAl2SiO5(OH)2 C 2/c 2/m

 

52.03.03.03 Ottrelite (Mn,Fe,Mg)2Al4Si2O10(OH)4 C 2/c 2/m

 

52.03.03.04 Carboirite-VIII Fe(Al,Ge)2O[(Ge,Si)O4](OH)2 C1 1

Strunz Class: 09.JA.05 09 - SILICATES (Germanates)   09.J - Germanates   09.JA -Germanates  

09.JA.05 Carboirite-III FeAl2GeO5(OH)2 C1 1

 

09.JA.05 Carboirite-VIII Fe(Al,Ge)2O[(Ge,Si)O4](OH)2 C1 1

 

09.JA.05 Orebroite-VIII Mn3(Sb,Fe)SiO4(O,OH)3 P 3 3

 

Other Carboirite-VIII Information

References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8) See Also: Links to other databases for Carboirite-VIII :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info
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