Mineralogy Database

Carboirite-VIII Mineral Data

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General Carboirite-VIII Information

Help on Chemical  Formula: Chemical Formula: Fe++(Al,Ge)2 O[(Ge,Si)O4](OH)2
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Fe2+Al1.8Ge0.2O(GeO4)0.7(SiO4)0.3(OH)2
Help on Environment: Environment: Found in sphalerite associated with Ge-bearing quartz.
Help on IMA Status: IMA Status: Approved IMA 1983
Help on Locality: Locality: Carboire, Ariege, central Pyrenees, France. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.

Carboirite-VIII Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.7082:1:1.6692
Help on Cell Dimensions: 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
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: C1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.528(1), 2.48(0.9), 2.728(0.9),

Physical Properties of Carboirite-VIII

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

Optical Properties of Carboirite-VIII

Help on Gladstone-Dale: Gladstone-Dale: CI calc= 0.085 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.182,KC= 0.1988
Ncalc = 1.8
Help on Optical Data: 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

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

Carboirite-VIII Classification

Help on  Dana Class: Dana Class: (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O
  (52.03)with cations in [6] coordination only
  (52.03.03)Chloritoid group Chloritoid (Fe,Mg,Mn)2Al4Si2O10(OH)4 P1 1 Magnesiochloritoid MgAl2SiO5(OH)2 C 2/c 2/m Ottrelite (Mn,Fe,Mg)2Al4Si2O10(OH)4 C 2/c 2/m Carboirite-VIII Fe(Al,Ge)2O[(Ge,Si)O4](OH)2 C1 1
Help on  Strunz Class: 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

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: 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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Print or Cut-and-Paste your Carboirite-VIII Specimen Label here :


Fe++(Al,Ge)2 O[(Ge,Si)O4](OH)2
Dana No: Strunz No: 09.JA.05





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