Molybdomenite Mineral Data

General Molybdomenite Information

Chemical Formula:

PbSeO3

Composition:

Molecular Weight = 334.16 gm

Lead 62.01 % Pb 66.79 % PbO

Selenium 23.63 % Se 33.21 % SeO₂

Oxygen 14.36 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

PbSeO₃

Environment:

Alteration product of clausthalite.

IMA Status:

Valid Species (Pre-IMA) 1882

Locality:

Cerro de Cachueta, Mendoza, Argentina. Link to MinDat.org Location Data.

Name Origin:

Named for the composition of lead (Greek - molybdos) and selenium (Greek - mene "moon").

Name Pronunciation:

Molybdomenite + Pronunciation

Synonym:

ICSD 9380

Kerstenite - (of Dana) = molybdomenite

PDF 15-462

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Molybdomenite Crystallography

Axial Ratios:

a:b:c =1.2518:1:0.8211

Cell Dimensions:

a = 6.86, b = 5.48, c = 4.5, Z = 2; beta = 112.7° V = 156.06 Den(Calc)= 7.11

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/m

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

By Intensity(I/I_o): 2.756(1), 3.32(0.9), 3.43(0.7),

Crystal Structure:

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Pasero M , Rotiroti N , Neues Jahrbuch fur Mineralogie, Monatshefte , 2003 (2003) p.145-152, The crystal structure of molybdomenite, PbSeO3, Locality: El Dragon mine, Potosi, Bolivia

Physical Properties of Molybdomenite

Cleavage:

{001} Good, {h0l} Fair

Color:

Colorless, Yellowish white.

Density:

7.07

Diaphaneity:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).

Hardness:

3.5 - Copper Penny

Luster:

Pearly

Streak:

white

Optical Properties of Molybdomenite

Gladstone-Dale:

CI meas= -0.041 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.035 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1589,KPDmeas= 0.1598,KC= 0.1536
Ncalc = 2.09

Optical Data:

Biaxial (-), a=2.12, g=2.14, bire=0.0200, 2V(Meas)=80.

Calculated Properties of Molybdomenite

Electron Density:

Bulk Density (Electron Density)=5.96 gm/cc
note: Specific Gravity of Molybdomenite =7.11 gm/cc.

Fermion Index:

Fermion Index = 0.15
Boson Index = 0.85

Photoelectric:

PE_{Molybdomenite}=1,155.81 barns/electron
U=PE_{Molybdomenite} x rElectron Density=6,885.95 barns/cc.

Radioactivity:

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

Molybdomenite Classification

Dana Class:

34.01.01.01 (34)Selenites - Tellurites - Sulfites

(34.01)as A++ XO3

(34.01.01)Dana Group

34.01.01.01 Molybdomenite PbSeO3 P 2₁/m 2/m

34.01.01.02 Scotlandite PbSO3 P 2/m 2/m

Strunz Class:

04.JF.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.J - Arsenites, Antimonites, Bismuthites, Sulfites,

04.JF -Selenites without additional anions, without H2O

04.JF.05 Molybdomenite PbSeO3 P 2₁/m 2/m

Other Molybdomenite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Molybdomenite :
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
15 - WWW-MINCRYST

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

Molybdomenite

PbSeO3
Dana No: 34.01.01.01 Strunz No: 04.JF.05
Locality:

Notes: