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Plumbotsumite

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Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto (Oshikoto) Region, Namibia
© Brent Thorne 2007

Formula:
Pb
 
5
Si
 
4
O
 
8
(OH)
 
10
System:OrthorhombicColour:Colourless
Hardness:2
This page provides mineralogical data about Plumbotsumite.

Classification of Plumbotsumite

IMA status:Approved
Strunz 8th edition ID:8/D.22-10
Nickel-Strunz 10th (pending) edition ID:9.HH.20

9 : SILICATES (Germanates)
H : Unclassified silicates
H : With Pb
Dana 8th edition ID:78.1.7.1

78 : Unclassified Silicates
1 : Miscellaneous
Hey's CIM Ref.:14.13.2

14 : Silicates not Containing Aluminum
13 : Silicates of Pb
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Type Occurrence of Plumbotsumite

Type Locality:Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto (Oshikoto) Region, Namibia
Year of Discovery:1982

Physical Properties of Plumbotsumite

Diaphaneity (Transparency):Transparent
Colour:Colourless
Hardness (Mohs):2

Crystallography of Plumbotsumite

Crystal System:Orthorhombic
Cell Parameters:a = 15.87Å, b = 9.26Å, c = 29.36Å
Ratio:a:b:c = 1.714 : 1 : 3.171
Unit Cell Volume:V 4,314.63 ų (Calculated from Unit Cell)

Optical Data of Plumbotsumite

Type:Biaxial (-)
RI values: nα = 1.922 nβ = 1.933 nγ = 1.938
2V:Measured: 32° , Calculated: 66°
Maximum Birefringence:δ = 0.016

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Dispersion:r > v strong

Chemical Properties of Plumbotsumite

Formula:
Pb
 
5
Si
 
4
O
 
8
(OH)
 
10
Essential elements:H, O, Pb, Si
All elements listed in formula:H, O, Pb, Si

Relationship of Plumbotsumite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.HH.05Macquartite
Pb
 
3
Cu(CrO
 
4
)(SiO
 
3
)(OH)
 
4
·2H
 
2
O
9.HH.10Luddenite
Cu
 
2
Pb
 
2
Si
 
5
O
 
14
·4H
 
2
O
9.HH.15Creaseyite
Cu
 
2
Pb
 
2
(Fe,Al)
 
2
Si
 
5
O
 
17
·6H
 
2
O
9.HH.25Molybdophyllite
Pb
 
2
Mg
 
2
[(OH)
 
2
|Si
 
2
O
 
7
]
Related Minerals - Hey's Index Grouping:

- +
14.13.1Alamosite
Pb
 
12
[Si
 
12
O
 
36
]
14.13.3Luddenite
Cu
 
2
Pb
 
2
Si
 
5
O
 
14
·4H
 
2
O
14.13.4Molybdophyllite
Pb
 
2
Mg
 
2
[(OH)
 
2
|Si
 
2
O
 
7
]
14.13.5Margarosanite
Pb(Ca,Mn
2+
 
)
 
2
[Si
 
3
O
 
9
]
14.13.6Ganomalite
Pb
 
9
Ca
 
5
Mn[O|SiO
 
4
|(Si
 
2
O
 
7
)
 
4
]
14.13.7Kentrolite
Pb
 
2
Mn
3+
2
[O
 
2
|Si
 
2
O
 
7
]
14.13.8Barysilite
Pb
 
8
Mn
2+
 
[Si
 
2
O
 
7
]
 
3
14.13.9Melanotekite
Pb
 
2
Fe
3+
2
[O
 
2
|Si
 
2
O
 
7
]
14.13.10Creaseyite
Cu
 
2
Pb
 
2
(Fe,Al)
 
2
Si
 
5
O
 
17
·6H
 
2
O

Other Names for Plumbotsumite

Synonyms:
IMA1979-049
Other Languages:
German:Plumbotsumit
Spanish:Plumbotsumita

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 Plumbotsumite

Reference List:American Mineralogist (1982): 67: 1075-1076.

Chemie der Erde (1982) 41, 1.

Articles/Blogs about Plumbotsumite

Internet Links for Plumbotsumite

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    Localities for Plumbotsumite

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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
    		Chemie der Erde (1982) 41, 1
    USA
     
    • Arizona
      • Pinal Co.
        • Mammoth District
          • Tiger
            • St. Anthony deposit
    		Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 332.
    Mineral and/or Locality
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