Plumalsite Mineral Data

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

Environment:

Continental deposits and the upper part of the weathered crust of crystalline rocks. Evidently of supergene origin.

IMA Status:

Not Approved IMA 1968

Locality:

Ukrainian Shield. Link to MinDat.org Location Data.

Name Origin:

Named for the composition (Pb, Al, Si).

Plumalsite Crystallography

Crystal System:

Orthorhombic Space 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:

Bulk Density (Electron Density)=3.81 gm/cc
note: Specific Gravity of Plumalsite =4.35 gm/cc.

Fermion Index:

Fermion Index = 0.13
Boson Index = 0.87

Photoelectric:

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

Radioactivity:

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

Plumalsite Classification

Dana Class:

65.00.00.00 (65)Inosilicate Minerals

(65.00)Without Dana Classification Numbers

(65.00.00)Inosilicate

65.00.00.00 Ashcroftine-(Ce)* K5Na5(Ce,Ca)12Si28O70(OH)2(CO3)8•8(H2O) I 4/mmm 4/m 2/m 2/m

65.00.00.00 Brokenhillite* (Mn,Fe)32[Si24O60]OH29Cl11 P 6₃mc 6mm

65.00.00.00 Grossmanite CaTiAlSiO6 C 2/m 2/m

65.00.00.00 Hypersthene? (Mg,Fe)2Si2O6 2/m 2/m 2/m

65.00.00.00 IMA2007-015 K(CaNa)(Fe3Al2)(Si6Al2)O22(OH)2 C 2/m 2/m

65.00.00.00 IMA2008-070 NaLi2(Fe2Al2Li)(Si6Al2)O22F2 C 2/m 2/m

65.00.00.00 IMA2009-010 [Ba6(PO4)2(CO3)][Fe7(OH)4Fe2O2(SiO3)8] P1 1

65.00.00.00 IMA2009-012 NaNa2(Mg2Al2Li)Si8O22F2 C 2/m 2/m

65.00.00.00 Kushiroite CaAl2SiO6 C 2/c 2/m

65.00.00.00 Plumalsite* Pb4Al2(SiO3)7(?) Unk Ortho

Strunz Class:

09.DX.00 09 - SILICATES (Germanates)

09.D - Unclassified Strunz Inosilicates

09.DX -Inosilicate

09.DX.00 Hypersthene? (Mg,Fe)2Si2O6 2/m 2/m 2/m

09.DX.00 Plumalsite* Pb4Al2(SiO3)7(?) Unk Ortho

09.DX.00 IMA2008-070 NaLi2(Fe2Al2Li)(Si6Al2)O22F2 C 2/m 2/m

09.DX.00 IMA2007-015 K(CaNa)(Fe3Al2)(Si6Al2)O22(OH)2 C 2/m 2/m

09.DX.00 Tanohataite! LiMn2Si3O8(OH) P1 1

09.DX.00 Punkaruaivite! Li{Ti2(OH)2[Si4O11(OH)]}•H2O C 2/c 2/m

09.DX.00 Yegorovite! Na4[Si2O4(OH)2]2•7H2O P 2₁/c 2/m

09.DX.00 Kushiroite CaAl2SiO6 C 2/c 2/m

09.DX.00 Grossmanite CaTiAlSiO6 C 2/m 2/m

09.DX.00 IMA2009-009 KNa2Li(Mg,Fe)2Ti2Si8O24 C 2/m 2/m

09.DX.00 IMA2009-010 [Ba6(PO4)2(CO3)][Fe7(OH)4Fe2O2(SiO3)8] P1 1

09.DX.00 IMA2009-012 NaNa2(Mg2Al2Li)Si8O22F2 C 2/m 2/m

Other Plumalsite Information

References:

NAME( AmMin, v53:349) 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 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Plumalsite

Pb4Al2(SiO3)7 (?)
Dana No: 65.00.00.00 Strunz No: 09.DX.00
Locality:

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