Tsumgallite Mineral Data

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

Tsumgallite Image

Images:

Tsumgallite

Comments: BSE image of an irregular patch of dark tsumgallite in complex ore.
Location: Tsumeb mine, Tsumeb, Namibia.. Scale: See Image.
© Diederik Visser

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.

Diaphaneity:

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:

Bulk Density (Electron Density)=4.76 gm/cc
note: Specific Gravity of Tsumgallite =5.08 gm/cc.

Fermion Index:

Fermion Index = 0.0035419123
Boson Index = 0.9964580877

Photoelectric:

PE_Tsumgallite= 36.38 barns/electron
U=PE_Tsumgallite x rElectron Density= 173.28 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Tsumgallite is Not Radioactive

Tsumgallite Classification

Dana Class:

06.01.01.06 (06)Hydroxides and Oxides Containing Hydroxyl

(06.01)where X+++O OH

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

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

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

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

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

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

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

Strunz Class:

04.FD.10 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.F - Hydroxides (without V or U)

04.FD -Hydroxides with OH, without H2O; chains of edge-sharing octahedra

04.FD.10 Bracewellite CrO(OH) Pbnm 2/m 2/m 2/m

04.FD.10 Diaspore AlO(OH) Pbnm 2/m 2/m 2/m

04.FD.10 Guyanaite CrO(OH) Pnnm 2/m 2/m 2/m

04.FD.10 Groutite MnO(OH) Pbnm 2/m 2/m 2/m

04.FD.10 Goethite FeO(OH) Pbnm 2/m 2/m 2/m

04.FD.10 Montroseite (V,Fe,V)O(OH) Pbnm 2/m 2/m 2/m

04.FD.10 Tsumgallite! GaO(OH) Pbnm 2/m 2/m 2/m

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

Tsumgallite

GaO(OH)
Dana No: 06.01.01.06 Strunz No: 04.FD.10
Locality:

Notes: