Plumalsite Mineral Data

Plumalsite Mineral Data

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General Plumalsite Information

Chemical Formula:

Pb4Al2(SiO3)7 (?)

Composition:

Molecular Weight = 1,415.35 gm

Aluminum 3.81 % Al 7.20 % Al₂O₃

Silicon 13.89 % Si 29.72 % SiO₂

Lead 58.56 % Pb 63.08 % PbO

Oxygen 23.74 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Pb₄Al₂Si₇O₂₁

IMA Status:

Discredited IMA 1968

Locality:

Link to MinDat.org Location Data.

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Images:

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Try searching images.google.com or Mindat Picture Gallary for mineral pictures. Caution: The images retrieved may not be appropriate.

Plumalsite Crystallography

Crystal System:

OrthorhombicSpace Group: Unk

Physical Properties of Plumalsite

Cleavage:

None

Color:

Colorless, Green, Yellow.

Density:

4.35

Hardness:

5-6 - Between Apatite and Orthoclase

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Plumalsite

Optical Data:

NCalc= 1.7 - from Gladstone-Dale relationship (KC = 0.1606) where Ncalc=Dmeas*KC+1

Calculated Properties of Plumalsite

Electron Density:

r_electron=3.81 gm/cc
note: r_Plumalsite=4.35 gm/cc.

Fermion Index

Fermion Index = 0.13601
Boson Index = 0.86399

Photoelectric:

PE_Plumalsite=1,026.77 barns/electron
U=PE_Plumalsite x r_electron=3,913.09 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Plumalsite is Not Radioactive

Plumalsite Classification

Dana Class:

65.0.0.0 (65)Inosilicate Minerals

(65.0)Without Dana Classification Numbers

(Inosilicate)

Strunz Class:

VIII/F.31-30 VIII - Silicates

VIII/F - Inosilicates (chain and band) Seven bands [Si7O21]14-

VIII/F.31 - Pyroxferroite - Plumalsite series

VIII/F.31-10 Pyroxferroite (Fe,Mn)7[Si7O21] P1 1

VIII/F.31-20 Pyroxmangite (Mn,Fe)SiO3 P1 1

VIII/F.31-30 Plumalsite Pb4Al2(SiO3)7(?) Unk Ortho

Other Plumalsite Information

References:

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

See Also:

Links to other databases for Plumalsite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Plumalsite

Pb4Al2(SiO3)7 (?)
Dana No: Unknown Strunz No: VIII/F.31-30
Locality:

Notes: