Plumbotsumite
A valid IMA mineral species
This page is currently not sponsored. Click here to sponsor this page.
About Plumbotsumite
Formula:
Pb13(CO3)6(Si10O27) · 3H2O
Colour:
Colourless to white
Lustre:
Adamantine, Resinous, Pearly
Hardness:
2
Specific Gravity:
5.6
Crystal System:
Orthorhombic
Name:
Named for its composition, which includes lead (plumbo), and its type locality, Tsumeb, Namibia.
New formula according to Cooper (pers. comm.), in Marty et al. (2010).
Originally given formula was Pb5Si4O8(OH)10.
May be confused with leadhillite or susannite.
Originally given formula was Pb5Si4O8(OH)10.
May be confused with leadhillite or susannite.
Unique Identifiers
Mindat ID:
3230
Long-form identifier:
mindat:1:1:3230:4
IMA Classification of Plumbotsumite
Approved
IMA Formula:
Pb2+5Si4O8(OH)10
Approval year:
1979
First published:
1982
Classification of Plumbotsumite
9.HH.20
9 : SILICATES (Germanates)
H : Unclassified silicates
H : With Pb
9 : SILICATES (Germanates)
H : Unclassified silicates
H : With Pb
78.1.7.1
78 : Unclassified Silicates
1 : Miscellaneous
78 : Unclassified Silicates
1 : Miscellaneous
14.13.2
14 : Silicates not Containing Aluminum
13 : Silicates of Pb
14 : Silicates not Containing Aluminum
13 : Silicates of Pb
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Ptm | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pronunciation of Plumbotsumite
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Debbie Woolf | United Kingdom |
Physical Properties of Plumbotsumite
Adamantine, Resinous, Pearly
Transparency:
Transparent, Translucent
Comment:
pearly on cleavage surfaces.
Colour:
Colourless to white
Streak:
White
Hardness:
2 on Mohs scale
Cleavage:
Perfect
{001}
{001}
Density:
5.6 g/cm3 (Measured) 5.56 g/cm3 (Calculated)
Optical Data of Plumbotsumite
Type:
Biaxial (-)
RI values:
nα = 1.922(5) nβ = 1.933(4) nγ = 1.938(4)
2V:
Measured: 32° (5), Calculated: 66°
Max. Birefringence:
δ = 0.016
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate
Dispersion:
r > v strong
Chemistry of Plumbotsumite
Mindat Formula:
Pb13(CO3)6(Si10O27) · 3H2O
Element Weights:
Crystallography of Plumbotsumite
Crystal System:
Orthorhombic
Class (H-M):
222 - Disphenoidal
Space Group:
C2221
Cell Parameters:
a = 15.875(4) Å, b = 9.261(3) Å, c = 29.364(9) Å
Ratio:
a:b:c = 1.714 : 1 : 3.171
Unit Cell V:
4,317.05 ų (Calculated from Unit Cell)
Z:
10
Morphology:
irregular to skeletal pseudohexagonal crystals
Twinning:
V-shaped penetration twins.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47h : [Near-surface oxidized, dehydrated minerals] |
Type Occurrence of Plumbotsumite
Place of Conservation of Type Material:
Institute for Mineralogy and Crystal Chemistry, University of Stuttgart, Germany, NM10; National Museum of Natural History, Washington, D.C., USA, 148301.
Associated Minerals at Type Locality:
Synonyms of Plumbotsumite
Other Language Names for Plumbotsumite
Common Associates
Associations Based on Photo Data:
| 5 photos of Plumbotsumite associated with Plumbophyllite | Pb2Si4O10 · H2O |
| 5 photos of Plumbotsumite associated with Mimetite | Pb5(AsO4)3Cl |
| 3 photos of Plumbotsumite associated with Fluorite | CaF2 |
| 2 photos of Plumbotsumite associated with 'Opal-AN' | SiO2 · nH2O |
| 2 photos of Plumbotsumite associated with Quartz | SiO2 |
| 1 photo of Plumbotsumite associated with Alamosite | PbSiO3 |
| 1 photo of Plumbotsumite associated with Melanotekite | Pb2Fe3+2(Si2O7)O2 |
| 1 photo of Plumbotsumite associated with Galena | PbS |
| 1 photo of Plumbotsumite associated with Chalcocite | Cu2S |
| 1 photo of Plumbotsumite associated with Perite | PbBiClO2 |
Related Minerals - Strunz-mindat Grouping
| 9.HH.05 | Macquartite | Cu2Pb7(CrO4)4(SiO4)2(OH)2 |
| 9.HH.10 | Luddenite | Cu2Pb2Si5O14 · 4H2O |
| 9.HH.15 | Creaseyite | Pb2Cu2Fe3+2(Si4.67Al0.33)O15.33(OH)3 · H2O |
| 9.HH.25 | Molybdophyllite | Pb8Mg9[Si10O28(OH)8O2(CO3)3] · H2O |
Other Information
Notes:
Dissolves with difficulty in hot HNO3.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Plumbotsumite
mindat.org URL:
https://www.mindat.org/min-3230.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Plumbotsumite
Localities for Plumbotsumite
Showing 9 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
France | |
| Vincent Bourgoin collection. |
Namibia (TL) | |
| Keller et al. (1982) |
USA | |
| Anthony et al. (1995) |
| Thorne (n.d.) |
| Collected by and in the collection of ... | |
| Thorne (n.d.) | |
| Thorne (n.d.) | |
| Collected by and in the collection of ... +2 other references |
| Collected by and in the collection of ... +1 other reference |
Quick NavTopAbout PlumbotsumiteUnique IdentifiersIMA Classification Classification Mineral SymbolsPronunciation Physical Properties Optical Data Chemistry Crystallography Geological EnvironmentType Occurrence SynonymsOther LanguagesCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Les Molérats Mine, Saint-Prix, Autun, Saône-et-Loire, Bourgogne-Franche-Comté, France