Tsumgallite Mineral Data

Tsumgallite Mineral Data

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General Tsumgallite Information

Chemical Formula:

GaO(OH)

Composition:

Molecular Weight = 100.05 gm

Zinc 0.65 % Zn 0.81 % ZnO

Gallium 59.93 % Ga 80.56 % Ga₂O₃

Iron 2.79 % Fe 3.59 % FeO

Silicon 0.56 % Si 1.20 % SiO₂

Germanium 2.90 % Ge 4.18 % GeO₂

Hydrogen 1.02 % H 9.09 % H₂O

Oxygen 32.14 % O

______ ______

100.00 % 99.44 % = TOTAL OXIDE

Empirical Formula:

Ga_0.86Fe²⁺_0.05Ge_0.04Si_0.02Zn_0.01O(OH)_1.01

Environment:

Associated in vugs in specimens of tennanite-germanite ore. Isostructural with goethite.

IMA Status:

Approved IMA 2003 (Dana # Added)

Locality:

Tsumeb mine, Tsumeb, Namibia. Link to MinDat.org Location Data.

Name Origin:

Named for the Tsumeb mine and the composition (GALLium).

Synonym:

IMA2002-011

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Tsumgallite Crystallography

Axial Ratios:

a:b:c =0.4617:1:0.3036

Cell Dimensions:

a = 4.512, b = 9.772, c = 2.967, Z = 4; V = 130.82 Den(Calc)= 5.08

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pbnm

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.404(1)(111), 4.089(1)(110), 2.632(0.33)(130),1.69(0.26)(221), 2.53(0.22)(021), 1.538(0.21)(151,160),

Physical Properties of Tsumgallite

Cleavage:

[010] Perfect

Color:

Pale greenish yellow, Biege.

Diaphaniety:

Translucent

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Irregular Grains - Occurs as splotchy, anhedral crystals forming inclusions in other minerals or rocks.

Habit:

Micaceous - Platy texture with "flexible" plates.

Hardness:

1.5-2.5 - Hardness very near Gypsum

Luster:

Pearly

Optical Properties of Tsumgallite

Optical Data:

Biaxial (?)

NCalc= 1.94 - from Gladstone-Dale relationship (KC = 0.1854) where Ncalc=Dcalc*KC+1

Calculated Properties of Tsumgallite

Electron Density:

r_electron=4.76 gm/cc
note: r_Tsumgallite=5.08 gm/cc.

Fermion Index

Fermion Index = 0.00354
Boson Index = 0.99646

Photoelectric:

PE_Tsumgallite= 36.38 barns/electron
U=PE_Tsumgallite x r_electron= 173.28 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Tsumgallite is Not Radioactive

Tsumgallite Classification

Dana Class:

6.1.1.6 (6)Hydroxides and Oxides Containing Hydroxyl

(6.1)where X+++O OH

(6.1.1)Diaspore group (Orthorhombic, Pnma or Pnmd)

6.1.1.1 Diaspore AlO(OH) Pbnm 2/m 2/m 2/m

6.1.1.2 Goethite FeO(OH) Pbnm 2/m 2/m 2/m

6.1.1.3 Groutite MnO(OH) Pbnm 2/m 2/m 2/m

6.1.1.4 Montroseite (V,Fe,V)O(OH) Pbnm 2/m 2/m 2/m

6.1.1.5 Bracewellite CrO(OH) Pbnm 2/m 2/m 2/m

6.1.1.6 Tsumgallite ! GaO(OH) Pbnm 2/m 2/m 2/m

Strunz Class:

IV/F.06-25 IV - Oxides

IV/F - Hydroxides and oxidic hydrates, water-bearing oxides with layered structure

IV/F.06 - Diaspore - Goethite - Faitknechtite series

IV/F.06-10 Diaspore AlO(OH) Pbnm 2/m 2/m 2/m

IV/F.06-20 Boehmite AlO(OH) Amam 2/m 2/m 2/m

IV/F.06-25 Tsumgallite GaO(OH) Pbnm 2/m 2/m 2/m

IV/F.06-30 Goethite FeO(OH) Pbnm 2/m 2/m 2/m

IV/F.06-40 Lepidocrocite FeO(OH) Amam 2/m 2/m 2/m

IV/F.06-50 Akaganeite Fe(O,OH,Cl) I2/m 2/m

IV/F.06-60 Feroxyhyte FeO(OH) Unk Hex

IV/F.06-70 Manganite MnO(OH) B21/d 2/m

IV/F.06-80 Groutite MnO(OH) Pbnm 2/m 2/m 2/m

IV/F.06-90 Feitknechtite beta-MnO(OH) Unk Hex

Other Tsumgallite Information

References:

NAME( AmMin, v 89, p 896) PHYS. PROP.(AmMin, v 89, p 896) OPTIC PROP.(AmMin, v 89, p 896)

See Also:

Links to other databases for Tsumgallite :
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

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Print or Cut-and-Paste your Tsumgallite Specimen Label here :

Tsumgallite

GaO(OH)
Dana No: 6.1.1.6 Strunz No: IV/F.06-25
Locality:

Notes: