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Tsumgallite

Formula:
GaO(OH)
System:OrthorhombicColour:Pale greenish yellow to ...
Hardness:1 - 2
Name:Named for the type locality, the TSUMcor Mine, Tsumeb, Namibia, and the chemical composition, which contains GALLium.


Diaspore Group.

Tsumgallite is a gallium oxide hydroxide.

Classification of Tsumgallite

IMA status:Approved 2002
Strunz 8th edition ID:4/F.06-25
Nickel-Strunz 10th (pending) edition ID:4.FD.10

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
D : Hydroxides with OH, without H2O; chains of edge-sharing octahedra
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Type Occurrence of Tsumgallite

Type Locality:Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto (Oshikoto) Region, Namibia
General Appearance of Type Material:Scaly mica-like aggregates less than 1 mm across. Individual thin, platy crystals not exceeding 40?m in size.
Geological Setting of type material:in vugs of a tennantite-germanite ore
Associated Minerals at type locality:
Zincian SideriteTennantiteSöhngeiteGermanite

Physical Properties of Tsumgallite

Lustre:Pearly
Diaphaneity (Transparency):Translucent
Colour:Pale greenish yellow to beige
Streak:white
Hardness (Mohs):1 - 2
Cleavage:Perfect
on {010}
Density (measured):5.08 g/cm3

Crystallography of Tsumgallite

Crystal System:Orthorhombic
Cell Parameters:a = 4.512Å, b = 9.773Å, c = 2.967Å
Ratio:a:b:c = 0.462 : 1 : 0.304
Unit Cell Volume:V 130.8 ų
Z:4
X-Ray Powder Diffraction:
d-spacingIntensity
4.089 (100)
2.404 (100)
2.632 (33)
1.690 (26)

Chemical Properties of Tsumgallite

Formula:
GaO(OH)
Essential elements:
All elements listed in formula:Ga, H, O
Analyical Data:The amount of water was taken from the ideal composition.
Ga2O3 (78.13)
Fe2O3 (3.99)
GeO2 (4.01)
ZnO (0.78)
SiO2 (1.07)
H2O(ideal) (8.77)

Sum 96.75 weight %
Empirical Formula:
(Ga
 
0.86
, Fe
3+
0.05
, Ge
 
0.04
, Si
 
0.02
, Zn
 
0.01
)
 
Σ0.98
 O(OH)
 
1.01
Common Impurities:Zn,Ge,Fe,Si

Relationship of Tsumgallite to other Species

Related Minerals - Nickel-Strunz Grouping):
4.FD.05Spertiniite
Cu(OH)
 
2
4.FD.10Bracewellite
CrO(OH)
4.FD.10Diaspore
AlO(OH)
4.FD.10Goethite
α-Fe
3+
 
O(OH)
4.FD.10Groutite
Mn
3+
 
O(OH)
4.FD.10Guyanaite
CrO(OH)
4.FD.10Montroseite
(V,Fe)O(OH)
4.FD.15Manganite
Mn
3+
 
O(OH)
4.FD.20Yttrotungstite-(Y)
YW
 
2
O
 
6
(OH)
 
3
4.FD.20Yttrotungstite-(Ce)
(Ce,Nd,Y)W
 
2
O
 
6
(OH)
 
3
4.FD.25Frankhawthorneite
Cu
 
2
[(OH)
 
2
|TeO
 
4
]
4.FD.30Khinite
Cu
 
3
Pb[(OH)
 
6
|TeO
 
4
]
4.FD.30Parakhinite
Cu
 
3
Pb[(OH)
 
6
|TeO
 
4
]

Other Names for Tsumgallite

Synonyms:
IMA2002-011
German names:
Tsumgallit
Russian names:
Цумгаллит
Spanish names:
Tsumgallita

Other Information

Fluorescence in UV light:none
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Tsumgallite

Reference List:Neues Jahrbuch für Mineralogie, Monatshefte (2003): 521-527.

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    Localities for Tsumgallite

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    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Namibia
     
    • Otjikoto (Oshikoto) Region
      • Tsumeb
    		Neues Jahrbuch für Mineralogie - Monatshefte Vol:2003 No.11 p521-527
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