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Pollucite

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Formula:
(Cs,Na)2(Al2Si4O12) · 2H2O
System:
Isometric
Colour:
Almost always colorless ...
Hardness:
Member of:
Name:
Named after Pollux, a figure from Greek mythology, brother of Castor, for its common association with "castorite" (petalite). The name was later changed to the current Pollucite.
Isostructural with:

Classification of Pollucite

Approved, 'Grandfathered' (first described prior to 1959)
9.GB.05

9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
B : Chains of single connected 4-membered rings
Dana 7th ed.:
77.1.1.2
77.1.1.2

77 : TECTOSILICATES Zeolites
1 : Zeolite group - True zeolites
16.5.1

16 : Silicates Containing Aluminum and other Metals
5 : Aluminosilicates of Cs, NH4 and Cu
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Type Occurrence of Pollucite

Physical Properties of Pollucite

Vitreous, Sub-Vitreous, Resinous, Waxy, Greasy
Diaphaneity (Transparency):
Transparent, Translucent
Comment:
Rarely as strong vitreous luster as quartz
Colour:
Almost always colorless or white, also light gray, light pink, light blue, pale violet
Comment:
May be slightly pink due to montmorillonite inclusions
Streak:
white
Hardness (Mohs):
Tenacity:
Very brittle
Cleavage:
None Observed
Fracture:
Sub-Conchoidal
Comment:
Very brittle when compared with quartz; frequently shows splintery broken fragments
Density:
2.9 g/cm3 (Measured)    2.96 g/cm3 (Calculated)

Crystallography of Pollucite

Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Ia3d
Cell Parameters:
a = 13.67Å
Unit Cell Volume:
V 2 ų
Z:
16
Morphology:
Almost always massive, rarely in trapezohedral or cubic crystals usually with both forms present, but either form may be dominant.
Comment:
A monoclinic variety (C2/c) has also been reported (Kamiya et al., 2008). Pollucite may probably be (as is analcime) cubic, tetragonal, orthorhombic, monoclinic or triclinic, depending on ordering.
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
X-Ray Powder Diffraction Data:
d-spacingIntensity
3.65 (30)
3.42 (100)
2.91 (45)
2.42 (20)
2.22 (20)
1.86 (20)
1.74 (20)
1.71 (10)
Comments:
25-194; also 29-407 (synthetic material)

Optical Data of Pollucite

Type:
Isotropic
Pleochroism:
Non-pleochroic
Comments:
Refractive index 1.508-1.528

Chemical Properties of Pollucite

Formula:
(Cs,Na)2(Al2Si4O12) · 2H2O
All elements listed in formula:
Common Impurities:
Fe,Ca,K,Rb

Relationship of Pollucite to other Species

Series:
Forms a series with Analcime (see here)
Member of:
Other Members of Group:
AlflarseniteNaCa2Be3Si4O13(OH) · 2H2O
AmiciteK2Na2Al4Si4O16 · 5H2O
Ammonioleucite(NH4,K)(AlSi2O6)
AnalcimeNa(AlSi2O6) · H2O
Barrerite(Na,K,Ca0.5)2[Al2Si7O18] · 7H2O
Bellbergite(K,Ba,Sr)2Sr2Ca2(Ca,Na)4[Al3Si3O12]6 · 30H2O
BikitaiteLiAlSi2O6 · H2O
BoggsiteCa8Na3(Si,Al)96O192 · 70H2O
Brewsterite-Ba(Ba,Sr)[Al2Si6O16] · 5H2O
Brewsterite-Sr(Sr,Ba,Ca)[Al2Si6O16] · 5H2O
Chabazite-Levyne Subgroup
ChiavenniteCaMnBe2Si5O13(OH)2 · 2H2O
Clinoptilolite-CaCa3(Si30Al6)O72·20H2O
Clinoptilolite-KK6(Si30Al6)O72·20H2O
Clinoptilolite-NaNa6(Si30Al6)O72·20H2O
CowlesiteCaAl2Si3O10 · 6H2O
Dachiardite-Ca(Ca,Na2,K2)5Al10Si38O96 · 25H2O
Dachiardite-KK4(Si20Al4O48)·13H2O
Dachiardite-Na(Na2,Ca,K2)5Al10Si38O96 · 25H2O
DirenzoiteNaK6MgCa2(Al13Si47O120) · 36H2O
EdingtoniteBa[Al2Si3O10] · 4H2O
EpistilbiteCaAl2Si6O16 · 5H2O
Erionite-Ca(Ca,K2,Na2)2[Al4Si14O36] · 15H2O
Erionite-K(K2,Ca,Na2)2[Al4Si14O36] · 15H2O
Erionite-Na(Na2,K2,Ca)2[Al4Si14O36] · 15H2O
Faujasite-Ca(Ca,Na2,Mg)3.5[Al7Si17O48] · 32H2O
Faujasite-Mg(Mg,Na2,Ca)3.5[Al7Si17O48] · 32H2O
Faujasite-Na(Na2,Ca,Mg)3.5[Al7Si17O48] · 32H2O
Ferrierite-K(K2,Na2,Mg,Ca)3-5Mg[Al5-7Si27.5-31O72] · 18H2O
Ferrierite-Mg(Mg,Na2,K2,Ca)3-5Mg[Al5-7Si27.5-31O72] · 18H2O
Ferrierite-Na(Na2,K2,Mg,Ca)3-5Mg[Al5-7Si27.5-31O72] · 18H2O
FerrochiavenniteCa1-2Fe[(Si,Al,Be)5Be2O13(OH)2] · 2H2O
Flörkeite(K3Ca2Na)[Al8Si8O32] · 12H2O
Garronite-CaNa2Ca5Al12Si20O64 · 27H2O
GaultiteNa4Zn2Si7O18 · 5H2O
Gismondine-BaBa2Al4Si4O16 · 4-6H2O
Gismondine-CaCaAl2Si2O8 · 4H2O
Gmelinite-CaCa2(Si8Al4O24] · 11H2O
Gmelinite-KK4(Si8Al4O24) · 11H2O
Gmelinite-NaNa4(Si8Al4O24] · 11H2O
GobbinsiteNa5(Si11Al5)O32 · 11H2O
Gonnardite(Na,Ca)2(Si,Al)5O10 · 3H2O
GoosecreekiteCa[Al2Si6O16] · 5H2O
GottardiiteNa3Mg3Ca5Al19Si117O272 · 93H2O
Harmotome(Ba0.5,Ca0.5,K,Na)5[Al5Si11O32] · 12H2O
Heulandite-Ba(Ba,Ca,K)5(Si27Al9)O72 · 22H2O
Heulandite-Ca(Ca,Na)5(Si27Al9)O72 · 26H2O
Heulandite-K(K,Ca,Na)5(Si27Al9)O72 · 26H2O
Heulandite-Na(Na,Ca,K)6(Si,Al)36O72 · 22H2O
Heulandite-Sr(Sr,Na,Ca)5(Si27Al9)O72 · 24H2O
HsianghualiteCa3Li2(Be3Si3O12)F2
KirchhoffiteCs(BSi2O6)
LaumontiteCaAl2Si4O12 · 4H2O
LovdariteK2Na6Be4Si14O36 · 9H2O
MaricopaitePb7Ca2(Si,Al)48O100 · 32H2O
Mazzite-Mg(Mg,K,Ca)5(Si26Al10)O72 · 28H2O
Mazzite-NaNa8[Al4Si14O36]2 · 30H2O
Merlinoite(K,Na)5(Ca,Ba)2Al9Si23O64 · 23H2O
MesoliteNa2Ca2Si9Al6O30 · 8H2O
Montesommaite(K,Na)9Al9Si23O64 · 10H2O
Mordenite(Na2,Ca,K2)Al2Si10O24 · 7H2O
MutinaiteNa3Ca4Si85Al11O192 · 60H2O
NabesiteNa2BeSi4O10 · 4H2O
NatroliteNa2Al2Si3O10 · 2H2O
Natrolite Subgroup
OffretiteKCaMg(Si13Al5)O36 · 15H2O
PahasapaiteLi8(Ca,Li,K)10.5Be24(PO4)24 · 38H2O
ParanatroliteNa2Al2Si3O10 · 3H2O
ParthéiteCa2(Si4Al4) O15 (OH)2•4H2O
Paulingite-Ca(Ca,K,Na,Ba,◻)10 (Si, Al)42O84•34H2O
Paulingite-K(K2,Ca,Na2,Ba)5[Al10Si35O90] · 45H2O
Paulingite-Na(Na2,K2,Ca,Ba)5[Al10Si35O90] · 45H2O
PerlialiteK9Na(Ca,Sr)[Al2Si4O12]6 · 15H2O
Phillipsite-Ca(Ca0.5,K,Na,Ba0.5)4-7[Al4-7Si12-9O32 . 12H2O
Phillipsite-K(K,Na,Ca0.5,Ba0.5)4-7[Al4-7Si12-9O32] . 12H2O
Phillipsite-Na(Na,K,Ca0.5,Ba0.5)4-7[Al4-7Si12-9O32] · 12H2O
RoggianiteCa2Be(OH)2Al2Si4O13 · 2.5H2O
ScoleciteCaAl2Si3O10 · 3H2O
StelleriteCa4(Si28Al8)O72 · 28H2O
Stilbite-CaNaCa4[Al9Si27O72] · nH2O
Stilbite-Na(Na,Ca,K)6-7[Al8Si28O72] · nH2O
Terranovaite(Na,Ca)8(Si68Al12)O160 · 29H2O
Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
Thomsonite-SrNa(Sr,Ca)2[Al5Si5O20] · 7H2O
Tschernichite(Ca,Na2)[Al2Si4O12] · 4-8H2O
TschörtneriteCa4(Ca,Sr,K,Ba)3Cu3[(OH)2|Al3Si3O12]4 · nH2O
WairakiteCa(Al2Si4O12) · 2H2O
WeinebeneiteCaBe3(PO4)2(OH)2 · 4H2O
Wenkite(Ba,K)4(Ca,Na)6[(SO4)3|(Si,Al)20O39(OH)2] · 0.5H2O
WillhendersoniteKCa[Al3Si3O12] · 5H2O
YugawaraliteCaAl2Si6O16 · 4H2O
Common Associates:
9.GB.05Ammonioleucite(NH4,K)(AlSi2O6)
9.GB.05AnalcimeNa(AlSi2O6) · H2O
9.GB.05HsianghualiteCa3Li2(Be3Si3O12)F2
9.GB.05LithositeK6Al4Si8O25 · 2H2O
9.GB.05LeuciteK(AlSi2O6)
9.GB.05WairakiteCa(Al2Si4O12) · 2H2O
9.GB.05KirchhoffiteCs(BSi2O6)
9.GB.10LaumontiteCaAl2Si4O12 · 4H2O
9.GB.15YugawaraliteCaAl2Si6O16 · 4H2O
9.GB.20RoggianiteCa2Be(OH)2Al2Si4O13 · 2.5H2O
9.GB.25GoosecreekiteCa[Al2Si6O16] · 5H2O
9.GB.30Montesommaite(K,Na)9Al9Si23O64 · 10H2O
9.GB.35ParthéiteCa2(Si4Al4) O15 (OH)2•4H2O
16.5.2NanpingiteCsAl2(AlSi3O10)(OH,F)2
16.5.3Buddingtonite(NH4)(AlSi3)O8
16.5.4Ammonioleucite(NH4,K)(AlSi2O6)
16.5.5Tobelite(NH4,K)Al2(AlSi3O10)(OH)2
16.5.6Ajoite(K,Na)Cu7AlSi9O24(OH)6 · 3H2O
16.5.7PapagoiteCaCu[H3AlSi2O9]
77.1.1.1AnalcimeNa(AlSi2O6) · H2O
77.1.1.3WairakiteCa(Al2Si4O12) · 2H2O

Other Names for Pollucite

Name in Other Languages:
German:Pollucit
Latin:Pollux
Simplified Chinese:铯沸石
Spanish:Pollucita

Other Information

Usually non-fluorescent, rarely may have a pale yellow fluorescence in SW UV.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Pollucite

Reference List:
American Mineralogist (1967): 52: 1515-1518.

Černý, P. (1974) The present status of the analcime-pollucite series. Canadian Mineralogist: 12: 334-341.

Černý, P. and Simpson, F.M. (1978) The Tanco pegmatite at Bernic Lake, Manitoba. X. Pollucite. Canadian Mineralogist: 16: 325-333.

Černý, P. (1979) Pollucite and its alteration in geological occurrences and in deep-burial radioactive waste disposal. Scientific basis for Nuclear Waste Management: 1: 231-236.

Wang, X.J., Zou, T.R., Xu, J.G., Yu, X.Y., and Qiu, Y.Z. (1981) Study of pegmatite minerals of the Altai region. Science Publishing House, Beijing, China.

Sebastian, A. and Lagache, M. (1990) Experimental study of the equilibrium between pollucite, albite, and hydrothermal fluid in pegamtite systems. Mineralogical Magazine: 54: 447-454.

Teertstra, D.K. and Černý, P. (1992) Controls on morphology of analcime-pollucite in natural minerals, synthetic phases, and nuclear waste products. Crystal Research Technology: 27: 931-939.

Teertstra, D.K., Černý, P., and Chapman, R. (1992) Compositional heterogeneity ad alteration of pollucite from High Grade Dyke, southeastern Manitoba. Canadian Mineralogist: 30: 687-697.

Canadian Mineralogist (1994): 32: 69.

Legache, M. (1995) New experimental data on the stability of the pollucite-analcime series: application to natural assemblages. European Journal of Mineralogy: 7: 319-323.

Teertstra, D.K. and Černý, P. (1995) First natural occurrences of end-member pollucite: A product of low-temperature reequilibration. European Journal of Mineralogy: 7: 1137-1148.

Teertstra, D.K., Černý, P., and Novák, M. (1995) Compositional and textural evolution of pollucite in pegmatites of the Maldanubicum. Mineralogy and Petrology: 55: 37-51.

London, D., Morgan, G.B., VI, and Icehower, J. (1998) Stability and solubility of pollucite in granitic system at 200 MPa H2O. Canadian Mineralogist: 36: 497-510.

Zhu, J.C., Wu, C.N., Liu, C.S., Li, F.C., Huang, X.L., and Zhou, D.S. (2000) Magmatic-hydrothermal evolution and genesis of Koktokay no. 3 rare metal pegmatite dyke, Altai, China. Geological Journal of China Universities: 6(1): 40-52 (in Chinese with English abstract).

Mineralogical Record: 30: 5-6.

Zeitschrift für Kristallographie: 129: 280-302.

Ogorodova, L.P., Melchakova, L.V., Kiseleva, I.A., and Belitsky, I.A. (2003) Thermochemical study of natural pollucite. Thermochimica Acta: 403: 251-256.

Wang, R.C., Hu, H., Zhang, A.C., Huang, X.L., and Ni., P. (2004) Pollucite and the cesium-dominant analogue of polylithionite as expressions of extreme Cs enrichment in the Yichun topaz-lepidolite granite, southern China. Canadian Mineralogist: 42: 883-896.

Wang, R.C., Hu, H., Zhang, A.C., Fontan, F., Zhang, H., and de Parseval, P. (2006) Occurrence and late re-equilibration of pollucite from the Koktokay no. 3 pegmatite, Altai, northwestern China. American Mineralogist: 91: 729-739.

Natsumi Kamiya, Koji Nishi and Yoshinobu Yokomori (2008): Crystal structure of pollucite. Z. Kristallogr. 223, 584–590.

Gatta, G. Diego, et al (2009) On the Crystal structure and crystal chemistry of pollucite, (Cs,Na)16Al16Si32O96·nH2O: A natural microporous material of interest in nuclear technology, American Mineralogist: 94(11-12): 1560-1568.

Internet Links for Pollucite

Specimens:
The following Pollucite specimens are currently listed for sale on minfind.com.

Localities for Pollucite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Mineral and/or Locality  
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