Mineralogy Database

Pollucite Mineral Data

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General Pollucite Information

Help on Chemical  Formula: Chemical Formula: (Cs,Na)2Al2Si4O12•(H2O)
Help on Composition: Composition: Molecular Weight = 285.03 gm
   Cesium    27.98 %  Cs   29.66 % Cs2O
   Rubidium   1.20 %  Rb    1.31 % Rb2O
   Sodium     1.61 %  Na    2.17 % Na2O
   Aluminum   8.52 %  Al   16.10 % Al2O3
   Silicon   20.69 %  Si   44.27 % SiO2
   Hydrogen   0.71 %  H     6.32 % H2O
   Oxygen    39.29 %  O
            ______        ______ 
            100.00 %       99.83 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Cs0.6Na0.2Rb0.04Al0.9Si2.1O6•(H2O)
Help on Environment: Environment: Lithium-rich granitic pegmatites. Forms a series with analcime.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1846
Help on Locality: Locality: Elba, Italy Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after Pollux, a figure from Greek mythology, brother of Castor, for its common association with "castorite" (petalite).
Help on Name Pronunciation: Name Pronunciation: Pollucite + Pronunciation Say POLLUCITE
Help on Synonym: Synonym: ICSD 39895
  PDF 25-194

Pollucite Image

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Comments: Isometric crystal of pollucite with clear quartz and sucrosic albite matrix.
Location: Shigar mine, Dossu, Skardu, Pakistan. Scale: 14.6x10x11.5 cm.
© Fabre Minerals

Pollucite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 13.682, Z = 16; V = 2,561.23 Den(Calc)= 2.96
Help on Crystal System: Crystal System: Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: I a3d
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.907(1), 3.421(1), 3.652(0.8),

Physical Properties of Pollucite

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless, White, Gray, Pale pink, Blue.
Help on Density: Density: 2.9
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Hardness: Hardness: 6.5 - Pyrite
Help on Luminescence: Luminescence: Fluorescent, Short UV=cream white blue green, Long UV=weak orange.
Help on Luster: Luster: Vitreous - Dull
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white

Optical Properties of Pollucite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.046 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.066 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1757,KPDmeas= 0.1793,KC= 0.188
Ncalc = 1.55 - 1.56
Help on Optical Data: Optical Data: Isotropic, n=1.52.

Calculated Properties of Pollucite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.76 gm/cc
note: Specific Gravity of Pollucite =2.90 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0098528604
Boson Index = 0.9901471396
Help on Photoelectric: Photoelectric: PEPollucite = 114.28 barns/electron
U=PEPollucite x relectron= 315.74 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 484.85 (Gamma Ray American Petroleum Institute Units)
Concentration of Pollucite per GRapi unit = 0.21 (%)

Estimated Radioactivity from Pollucite - barely detectable


Pollucite Classification

Help on  Dana Class: Dana Class: (77)Tectosilicate Zeolite group
  (77.01)true zeolites
  (77.01.01)Analcime and related species Analcime NaAlSi2O6•(H2O) P1 1 Pollucite (Cs,Na)2Al2Si4O12•(H2O) I a3d 4/m 3 2/m Wairakite CaAl2Si4O12•2(H2O) I2/a 2/m Laumontite CaAl2Si4O12•4(H2O) C 2/m 2/m Hsianghualite Ca3Li2Be3(SiO4)3F2 I 213 2 3
Help on  Strunz Class: Strunz Class: 09.GB.05 09 - SILICATES (Germanates)
  09.G - Tektosilicates with Zeolitic H2O
  09.GB -Chains of single connected 4-membered rings
09.GB.05 Ammonioleucite (NH4,K)AlSi2O6 I 41/a 4/m
09.GB.05 Analcime NaAlSi2O6•(H2O) P1 1
09.GB.05 Hsianghualite Ca3Li2Be3(SiO4)3F2 I 213 2 3
09.GB.05 Lithosite K6Al4Si8O25•(H2O) P 21 (pseudo ORTH) 2
09.GB.05 Leucite KAlSi2O6 I 41/a 4/m
09.GB.05 Pollucite (Cs,Na)2Al2Si4O12•(H2O) I a3d 4/m 3 2/m
09.GB.05 Wairakite CaAl2Si4O12•2(H2O) I2/a 2/m

Other Pollucite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Collectors Book of Fluorescent Minerals) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Pollucite :
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 - Scandinavian mineral gallery

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Dana No: Strunz No: 09.GB.05





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