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Otjisumeite

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Big Photo

Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto (Oshikoto) Region, Namibia
© Brent Thorne




Formula:
PbGe
 
4
O
 
9
System:TriclinicHardness:3
Name:
From Otjisume, the Herero name for Tsumeb, Namibia.
This page provides mineralogical data about Otjisumeite.

Classification of Otjisumeite

IMA status:Approved
Strunz 8th edition ID:4/C.08-70
Nickel-Strunz 10th (pending) edition ID:9.J0.15

9 : SILICATES (Germanates)
J : Germanates
0 :
Dana 8th edition ID:7.10.3.1

7 : MULTIPLE OXIDES
10 : AB4X9
Hey's CIM Ref.:7.11.18

7 : Oxides and Hydroxides
11 : Oxides of Sn and Pb
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Type Occurrence of Otjisumeite

Type Locality:Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto (Oshikoto) Region, Namibia
Year of Discovery:1981

Physical Properties of Otjisumeite

Hardness (Mohs):3

Crystallography of Otjisumeite

Crystal System:Triclinic
Cell Parameters:a = 6.94Å, b = 6.58Å, c = 9.27Å
α = 102.94°, β = 103.05°, γ = 114.77°
Ratio:a:b:c = 1.055 : 1 : 1.409
Unit Cell Volume:V 349.32 ų (Calculated from Unit Cell)

Optical Data of Otjisumeite

Type:Biaxial (+)
RI values: nα = 1.920 nβ = 1.922 nγ = 1.943
2V:Measured: 20° , Calculated: 36°
Maximum Birefringence:δ = 0.023

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Dispersion:none

Chemical Properties of Otjisumeite

Formula:
PbGe
 
4
O
 
9
Essential elements:Ge, O, Pb
All elements listed in formula:Ge, O, Pb

Relationship of Otjisumeite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.J0.05Carboirite
FeAl
 
2
(GeO
 
4
)O(OH)
 
2
9.J0.10Bartelkeite
PbFe
2+
 
Ge
 
3
O
 
8
Related Minerals - Hey's Index Grouping:

- +
7.11.1Romarchite
SnO
7.11.2Cassiterite
SnO
 
2
7.11.4Schoenfliesite
Mg[Sn(OH)
 
6
]
7.11.5Burtite
Ca[Sn(OH)
 
6
]
7.11.6Vismirnovite
Zn[Sn(OH)
 
6
]
7.11.7Wickmanite
Mn
2+
 
[Sn(OH)
 
6
]
7.11.8Tetrawickmanite
Mn
2+
 
[Sn
4+
 
(OH)
 
6
]
7.11.9Jeanbandyite
(Fe
2+
 
,Mn
2+
 
)[Sn
4+
 
(OH)
 
6
]
7.11.10Natanite
Fe
2+
 
[Sn(OH)
 
6
]
7.11.11Mushistonite
(Cu,Zn,Fe
2+
 
)[Sn(OH)
 
6
]
7.11.12Ferronigerite-2N1S
Sn(Fe,Mg)Al
 
6
O
 
11
(OH)
7.11.13Magnesionigerite
7.11.14Argutite
GeO
 
2
7.11.15Brunogeierite
Fe
2+
2
Ge
4+
 
O
 
4
7.11.16Stottite
Fe
2+
 
[Ge
4+
 
(OH)
 
6
]
7.11.17Carboirite
FeAl
 
2
(GeO
 
4
)O(OH)
 
2
7.11.19Bartelkeite
PbFe
2+
 
Ge
 
3
O
 
8
7.11.20Massicot
PbO
7.11.21Litharge
PbO
7.11.22Minium
Pb
 
3
O
 
4
7.11.23Plattnerite
PbO
 
2
7.11.24Scrutinyite
alpha-PbO
 
2
7.11.25Murdochite
PbCu
 
6
O
 
8-x
(Cl,Br)
 
2x
 where x<=0.5
7.11.26Macedonite
PbTiO
 
3
7.11.27Cesàrolite
Pb(Mn
4+
 
)
 
3
O
 
6
(OH)
 
2
7.11.28Coronadite
Pb(Mn
4+
 
,Mn
3+
 
)
 
8
O
 
16
7.11.29Quenselite
PbMnO
 
2
(OH)
7.11.30Plumboferrite
Pb
 
2
Fe
3+
11-x
Mn
2+
x
O
 
19-2x
, x = 1/3
7.11.31Magnetoplumbite
(Pb,Mn)(Fe,Mn)
 
12
O
 
19
7.11.32Senaite
Pb(Ti,Fe,Mn)
 
21
O
 
38

Other Names for Otjisumeite

Synonyms:
IMA1978-080
Other Languages:
German:Otjisumeit
Spanish:Otjisumeita

Other Information

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 Otjisumeite

Reference List:

- +
American Mineralogist (1987): 72: 1026-1027.

Internet Links for Otjisumeite

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    • Localities for Otjisumeite

    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 Jahrb.Min.,Mh.(1981) 49-55
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