Plumbotsumite Mineral Data

General Plumbotsumite Information

Chemical Formula:

Pb5Si4O8(OH)10

Composition:

Molecular Weight = 1,446.41 gm

Silicon 7.77 % Si 16.62 % SiO₂

Hydrogen 0.70 % H 6.23 % H₂O

Lead 71.63 % Pb 77.16 % PbO

Oxygen 19.91 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Pb₅Si₄O₈(OH)₁₀

Environment:

A secondary mineral developed in the oxidized zone above complex galena-bearing ores.

IMA Status:

Approved IMA 1982

Locality:

From Tsumeb, Namibia. In the Mammoth-St. Anthony mine, Tiger, Pinal Co., Arizona, USA. Link to MinDat.org Location Data.

Name Origin:

For lead, PLUMBum, in the mineral's composition, and the type locality, TSUMeb, Namibia.

Name Pronunciation:

Plumbotsumite + Pronunciation

Plumbotsumite Image

Images:

Plumbotsumite

Comments: Translucent plumbotsumite microcrystals.
Location: Tsumeb, Oshikoto, Namibia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Plumbotsumite Crystallography

Axial Ratios:

a:b:c =1.7141:1:3.1707

Cell Dimensions:

a = 15.875, b = 9.261, c = 29.364, Z = 10; V = 4,317.05 Den(Calc)= 5.56

Crystal System:

Orthorhombic - Disphenoidal H-M Symbol (2 2 2) Space Group: C 222₁

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.65(1), 3.12(0.8), 14.7(0.7),

Physical Properties of Plumbotsumite

Cleavage:

{001} Perfect

Color:

Colorless.

Density:

5.6

Diaphaneity:

Transparent

Hardness:

2 - Gypsum

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Plumbotsumite

Gladstone-Dale:

CI meas= -0.05 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.057 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1674,KPDmeas= 0.1663,KC= 0.1584
Ncalc = 1.88 - 1.89

Optical Data:

Biaxial (-), a=1.922, b=1.933, g=1.938, bire=0.0160, 2V(Calc)=66, 2V(Meas)=32.

Calculated Properties of Plumbotsumite

Electron Density:

Bulk Density (Electron Density)=4.80 gm/cc
note: Specific Gravity of Plumbotsumite =5.60 gm/cc.

Fermion Index:

Fermion Index = 0.16
Boson Index = 0.84

Photoelectric:

PE_{Plumbotsumite}=1,282.92 barns/electron
U=PE_{Plumbotsumite} x rElectron Density=6,159.10 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Plumbotsumite is Not Radioactive

Plumbotsumite Classification

Dana Class:

78.01.07.01 (78)Unclassified silicates

(78.01)possible nesosilicates

(78.01.07)Dana Group

78.01.07.01 Plumbotsumite Pb5Si4O8(OH)10 C 222₁ 2 2 2

Strunz Class:

09.HH.20 09 - SILICATES (Germanates)

09.H - Unclassified Silicates

09.HH -With Pb

09.HH.20 Plumbotsumite Pb5Si4O8(OH)10 C 222₁ 2 2 2

Other Plumbotsumite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Plumbotsumite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

Search for Plumbotsumite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Plumbotsumite :

Ask about Plumbotsumite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Plumbotsumite Specimen Label here :

Plumbotsumite

Pb5Si4O8(OH)10
Dana No: 78.01.07.01 Strunz No: 09.HH.20
Locality:

Notes:

Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.