Carboirite-VIII Mineral Data

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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

$Help on X Ray Diffraction:$ 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 - Google Images
4 - Google Scholar
5 - MinDAT
6 - MinMax(Deutsch)
7 - MinMax(English)
8 - Mineralienatlas (Deutsch)
9 - QUT Mineral Atlas
10 - Ruff.Info

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Print or Cut-and-Paste your Carboirite-VIII Specimen Label here :

Carboirite-VIII

Fe++(Al,Ge)2 O[(Ge,Si)O4](OH)2
Dana No: 52.03.03.04 Strunz No: 09.JA.05
Locality:

Notes: