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Eyselite Mineral Data

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General Eyselite Information

Help on Chemical Formula: Chemical Formula: Fe+++Ge++++3O7(OH)
Help on Composition: Composition: Molecular Weight = 401.40 gm
   Gallium     0.69 %  Ga    0.93 % Ga2O3
   Iron       12.94 %  Fe   18.50 % Fe2O3
   Germanium  53.91 %  Ge   77.66 % GeO2
   Hydrogen    0.29 %  H     2.63 % H2O
   Oxygen     32.17 %  O
             ______        ______ 
             100.00 %       99.72 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe3+0.93Ga0.04Ge2.98O6.9(OH)1.17
Help on Environment: Environment: Eyselite was identified in a vug on a single specimen of renierite - germanite ore with minor associated tennantite.
Help on IMA Status: IMA Status: Approved IMA 2004 (Dana # Added)
Help on Locality: Locality: Tsumeb mine, Tsumeb, Namibia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Walter Hans Eysel (1935-1999), Professor of Crystallography at the Ruprecht-Karls-Universit�t, Heidelberg, Germany, for his contributions to the study of germanates.
Help on Synonym: Synonym: IMA2003-052
 

Eyselite Image

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  Eyselite

Comments: Pale yellowish brown crystalline aggregate of eyselite in a vug on sulfide ore. (CanMin 42:1773).
Location: Ge-bearing ore samples from Tsumeb mine, Tsumeb, Namibia. Scale: See Scale Bar.
© Canadian Mineralogist
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  Eyselite

Comments: SEM photomicrograph of platy/tabular crystals of eyselite. (CanMin 42:1773).
Location: Ge-bearing ore samples from Tsumeb mine, Tsumeb, Namibia. Scale: See Scale Bar.
© Canadian Mineralogist

Eyselite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.8542:1:0.4658
Help on Cell Dimensions: Cell Dimensions: a = 8.302, b = 9.718, c = 4.527, Z = 2; V = 365.23 Den(Calc)= 3.65
Help on Crystal System: Crystal System: Orthorhombic Space Group: P***
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.921(1)(211), 3.681(1)(111), 2.403(0.9)(320),1.646(0.8)(322), 3.121(0.6)(220,121), 1.624(0.5)(142), 2.512(0.4)(131), 4.105(0.4)(011),
 

Physical Properties of Eyselite

Help on Color: Color: Dirty brown yellow, Tan yellow.
Help on Diaphaneity: Diaphaneity: Translucent to Opaque
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: brownish yellow
 

Optical Properties of Eyselite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -0.104 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2192,KC= 0.1985
Ncalc = 1.72
Help on Optical Data: Optical Data: Biaxial (+)
 

Calculated Properties of Eyselite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.39 gm/cc
note: Specific Gravity of Eyselite =3.65 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PEEyselite = 38.07 barns/electron
U=PEEyselite x rElectron Density= 129.15 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Eyselite is Not Radioactive
 

Eyselite Classification
Help on Dana Class: Dana Class: 07.03.03.01 (07)Multiple Oxides
  (07.03)with 2+ and higher charged cations
  (07.03.03)Dana Group
 
07.03.03.01 Eyselite! FeGe3O7(OH) P*** Ortho
Help on Strunz Class: Strunz Class: 04.DM.20 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.D - Metal:Oxygen = 1:2 and similar
  04.DM -With large (� medium-sized) cations; unclassified
 
04.DM.20 Eyselite! FeGe3O7(OH) P*** Ortho
 

Other Eyselite Information
Help on References: References: NAME( CanMin, 42:1771) PHYS. PROP.(CanMin, 42:1771) OPTIC PROP.(CanMin, 42:1771)
Help on See Also: See Also: Links to other databases for Eyselite :
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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Eyselite

Fe+++Ge++++3O7(OH)
Dana No: 07.03.03.01 Strunz No: 04.DM.20
Locality:

 

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