Pollucite Mineral Data

Pollucite Mineral Data +

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General Pollucite Information

Chemical Formula:

(Cs,Na)2Al2Si4O12·(H2O)

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

Empirical Formula:

Cs_0.6Na_0.2Rb_0.04Al_0.9Si_2.1O₆·(H₂O)

Environment:

Lithium-rich granitic pegmatites. Forms a series with analcime.

IMA Status:

Valid Species (Pre-IMA) 1846

Locality:

Elba, Italy Link to MinDat.org Location Data.

Name Origin:

Named after Pollux, a figure from Greek mythology, brother of Castor, for its common association with "castorite" (petalite).

Synonym:

ICSD 39895

PDF 25-194

Pollucite Image

Images:

Pollucite

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

Cell Dimensions:

a = 13.682, Z = 16; V = 2,561.23 Den(Calc)= 2.96

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: I a3d

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

By Intensity(I/I_o): 2.907(1), 3.421(1), 3.652(0.8),

Crystal Structure:

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drag2 - RMB Resize/Rotate
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Newnham R E , American Mineralogist , 52 (1967) p.1515-1518, Crystal structure and optical properties of pollucite

View Additional jPOWD Structure files for Pollucite
[1]

Physical Properties of Pollucite

Cleavage:

None

Color:

Colorless, White, Gray, Pale pink, Blue.

Density:

2.9

Diaphaniety:

Transparent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

6.5 - Pyrite

Luminescence:

None.

Luster:

Vitreous - Dull

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Pollucite

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

Optical Data:

Isotropic, n=1.52.

Calculated Properties of Pollucite

Electron Density:

r_electron=2.76 gm/cc
note: r_Pollucite=2.90 gm/cc.

Fermion Index

Fermion Index = 0.00985
Boson Index = 0.99015

Photoelectric:

PE_Pollucite= 114.28 barns/electron
U=PE_Pollucite x r_electron= 315.74 barns/cc.

Radioactivity:

GRapi = 484.85 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Pollucite - barely detectable

Pollucite Classification

Dana Class:

77.1.1.2 (77)Tectosilicate Zeolite group

(77.1)true zeolites

(77.1.1)Analcime and related species

77.1.1.1 Analcime NaAlSi2O6·(H2O) P1 1

77.1.1.2 Pollucite (Cs,Na)2Al2Si4O12·(H2O) I a3d 4/m 3 2/m

77.1.1.3 Wairakite CaAl2Si4O12·2(H2O) I2/a 2/m

77.1.1.4 Laumontite CaAl2Si4O12·4(H2O) C 2/m 2/m

77.1.1.5 Hsianghualite Ca3Li2Be3(SiO4)3F2 I 2₁3 2 3

Strunz Class:

VIII/J.27-20 VIII - Silicates

VIII/J - Tectosilicates (network), with zeolite-structure, Bladed Zeolites

VIII/J.27 - Zeolite group, Analcime - Paulingite series

VIII/J.27-10 Analcime NaAlSi2O6·(H2O) P1 1

VIII/J.27-20 Pollucite (Cs,Na)2Al2Si4O12·(H2O) I a3d 4/m 3 2/m

VIII/J.27-30 Wairakite CaAl2Si4O12·2(H2O) I2/a 2/m

VIII/J.27-40 Faujasite-Na (Na2,Ca,Mg)3.5[Al7Si17O48]·32(H2O) F d3m 4/m 3 2/m

VIII/J.27-44 Faujasite-Mg! (Mg,Na2,Ca)3.5[Al7Si17O48]·32(H2O) F d3m 4/m 3 2/m

VIII/J.27-46 Faujasite-Ca! (Ca,Na2,Mg)3.5[Al7Si17O48]·32(H2O) F d3m 4/m 3 2/m

VIII/J.27-50 Paulingite-K (K2,Ca,Na2,Ba)5Al10Si35O90·45(H2O) Im3m 4/m 3 2/m

VIII/J.27-54 Paulingite-Ca! (Ca,K,Na,Ba)5[Al10Si35O84]·34(H2O) Im3m 4/m 3 2/m

Other Pollucite Information

References:

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

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Pollucite

(Cs,Na)2Al2Si4O12·(H2O)
Dana No: 77.1.1.2 Strunz No: VIII/J.27-20
Locality:

Notes: