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Krieselite Mineral Data

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General Krieselite Information

Help on Chemical  Formula: Chemical Formula: (Al,Ga)2(Ge,C)O4 (OH)2
Help on Composition: Composition: Molecular Weight = 230.81 gm
   Aluminum   17.54 %  Al   33.13 % Al2O3
   Gallium    15.10 %  Ga   20.30 % Ga2O3
   Germanium  23.59 %  Ge   33.99 % GeO2
   Hydrogen    0.87 %  H     7.81 % H2O
   Carbon      1.30 %  C     4.77 % CO2
   Oxygen     41.59 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Al1.5Ga0.5Ge0.75C0.25O4(OH)2
Help on Environment: Environment: Isotypic with topaz
Help on IMA Status: IMA Status: Proposed IMA 2003 (Dana # Added)
Help on Locality: Locality: Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Commission on New Minerals, Nomenclature and Classification (CNMNC)
Help on Synonym: Synonym: IMA2000-043a

Krieselite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.0684:1:0.5636
Help on Cell Dimensions: Cell Dimensions: a = 9.1111, b = 8.5276, c = 4.8064, Z = 4; V = 373.44 Den(Calc)= 4.10
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.016(1), 3.811(0.78), 3.315(0.48),2.247(0.38), 1.398(0.29), 2.417(0.27), 2.464(0.24),

Physical Properties of Krieselite

Help on Color: Color: Beige, White.
Help on Diaphaneity: Diaphaneity: Translucent
Help on Luster: Luster: Greasy (Oily)
Help on Streak: Streak: white

Optical Properties of Krieselite

Help on Optical Data: Optical Data: Biaxial (?)
  NCalc= 1.81 - from Gladstone-Dale relationship (KC = 0.1965) where Ncalc=Dcalc*KC+1

Calculated Properties of Krieselite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.93 gm/cc
note: Specific Gravity of Krieselite =4.10 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEKrieselite = 23.08 barns/electron
U=PEKrieselite x rElectron Density= 90.61 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Krieselite is Not Radioactive

Krieselite 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
  (52.03.01)Topaz Group Topaz Al2SiO4(F,OH)2 Pbnm 2/m 2/m 2/m Krieselite! (Al,Ga)2(Ge,C)O4(OH)2 P nma 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.AF.35 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AF -Nesosilicates with additional anions;
09.AF.35 Topaz Al2SiO4(F,OH)2 Pbnm 2/m 2/m 2/m
09.AF.35 Krieselite! (Al,Ga)2(Ge,C)O4(OH)2 P nma 2/m 2/m 2/m

Other Krieselite Information

Help on See Also: See Also: Links to other databases for Krieselite :
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 Krieselite Specimen Label here :


(Al,Ga)2(Ge,C)O4 (OH)2
Dana No: Strunz No: 09.AF.35