Mindat Logo
Home Page Log In Message Board The Mindat Directory
Register Search Pages Mineral Chatroom The Mindat Store

Otjisumeite

This page is currently not sponsored. Click here to sponsor this page.
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
mindat.org URL:http://www.mindat.org/min-3041.html
Please feel free to link to this page.

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
(Ge,Fe)Fe
 
2
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
PbH
 
2
Mn
 
3
O
 
8
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

Search Engines:
  • Look for Otjisumeite on Google
  • Look for Otjisumeite images on Google
    • External Links:
  • Look for Otjisumeite on Webmineral
  • Look for Otjisumeite on Athena Mineralogy
  • Look for Otjisumeite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Otjisumeite details from Handbook of Mineralogy (PDF)
    • Mineral Dealers:
  • webminerals
  • Top quality minerals from Kristalle of California
  • Buy from David K Joyce minerals
  • Search for Otjisumeite from all mineral dealers at minfind.com
  • DAKOTA MATRIX offers Cabinet and Rare Species from Worldwide Localities.
  • The Arkenstone - Fine Minerals
  • Fabre Minerals - search for Otjisumeite specimens
  • Fine Minerals from Weinrich Minerals, Inc.
  • Pricedownminerals.com - Reverse Auctions and Shop
  • Buy RARE Minerals from Rocks of Africa
  • Wilensky Fine Minerals
  • Rare and Unusual minerals at Mineralogical Research Company
    • Jobs:
  • Mining & Geology Jobs

    • 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.
    Hide Locality List
    (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
    Mineral and/or Locality
    Search Google
     
    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
    Current server date and time: 9th Sep 2011 21:56:20
    Mineral and Locality Search
    Mineral:
    and/or Locality:
    Options
    Fade toolbar when not in focusFix toolbar to bottom of page
    Hide Social Media Links
    Slideshow frame delay seconds