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Cs(Si2Al)O6 · nH2O
Almost always colorless ...
Vitreous, Sub-Vitreous, Resinous, Waxy, Greasy
Member of:
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 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
B : Chains of single connected 4-membered rings
Dana 7th ed.:

1 : Zeolite group - True zeolites

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

Physical Properties of Pollucite

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

Optical Data of Pollucite

Refractive index 1.508-1.528

Chemical Properties of Pollucite

IMA Formula:
Cs(Si2Al)O6 · nH2O
Elements listed in formula:
Common Impurities:

Crystallography of Pollucite

Crystal System:
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Cell Parameters:
a = 13.67 Å
Unit Cell Volume:
V 2 ų
Almost always massive, rarely in trapezohedral or cubic crystals usually with both forms present, but either form may be dominant.
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:
3.65 (30)
3.42 (100)
2.91 (45)
2.42 (20)
2.22 (20)
1.86 (20)
1.74 (20)
1.71 (10)
25-194; also 29-407 (synthetic material)

Type Occurrence of Pollucite

Relationship of Pollucite to other Species

Forms a series with Analcime (see here)
Member of:
Other Members of Group:
AlflarseniteNaCa2Be3Si4O13(OH) · 2H2O
AmiciteK2Na2Al4Si4O16 · 5H2O
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 SubgroupA subgroup of the Zeolite Group.
ChiavenniteCaMnBe2Si5O13(OH)2 · 2H2O
ClinoptiloliteNote on the distinguishing differences between clinoptilolite and heulandite (hhttp://rruff.
CowlesiteCaAl2Si3O10 · 6H2O
Dachiardite-Ca(Ca,Na2,K2)5Al10Si38O96 · 25H2O
Dachiardite-Na(Na2,Ca,K2)5Al10Si38O96 · 25H2O
DirenzoiteNaK6MgCa2(Al13Si47O120) · 36H2O
EdingtoniteBa[Al2Si3O10] · 4H2O
EpistilbiteCaAl2Si6O16 · 5H2O
ErioniteThis name now refers to a group of related minerals.
Faujasite SubgroupA subgroup of the Zeolite Group.
FerrieriteZeolite Group.
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
GmeliniteIn 1997, gmelinite was split into Gmelinite-Ca, Gmelinite-Na and Gmelinite-K.
GobbinsiteNa5(Si11Al5)O32 · 11H2O
GoosecreekiteCa[Al2Si6O16] · 5H2O
GottardiiteNa3Mg3Ca5Al19Si117O272 · 93H2O
Harmotome(Ba0.5,Ca0.5,K,Na)5[Al5Si11O32] · 12H2O
HeulanditeNote on the distinguishing differences between heulandite and clinoptilolite (http://rruff.
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
Montesommaite(K,Na)9Al9Si23O64 · 10H2O
Mordenite(Na2,Ca,K2)Al2Si10O24 · 7H2O
MutinaiteNa3Ca4Si85Al11O192 · 60H2O
NabesiteNa2BeSi4O10 · 4H2O
Natrolite SubgroupA subgroup of the Zeolite Group.
OffretiteKCaMg(Si13Al5)O36 · 15H2O
PahasapaiteLi8(Ca,Li,K)10.5Be24(PO4)24 · 38H2O
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
PhillipsiteZeolite Group.
RoggianiteCa2Be(OH)2Al2Si4O13 · 2.5H2O
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.05AnalcimeNaAlSi2O6 · H2O
9.GB.05WairakiteCa(Si4Al2)O12 · 2H2O
9.GB.10LaumontiteCa(Si4Al2)O12 · 4H2O
9.GB.15YugawaraliteCa(Si6Al2)O16 · 4H2O
9.GB.20RoggianiteCa2BeAl2Si4O13(OH)2 · nH2O (n < 2.5)
9.GB.25GoosecreekiteCa(Si6Al2)O16 · 5H2O
9.GB.30MontesommaiteK9(Si23Al9)O64 · 10H2O
9.GB.35ParthéiteCa2(Si4Al4)O15(OH)2 · 4H2O
16.5.6AjoiteK3Cu202+Al3Si29O76(OH)16 · 8H2O
16.5.7PapagoiteCaCuAlSi2O6(OH)3 · H2O · 2H2O

Other Names for Pollucite

Name in Other Languages:
Simplified Chinese:铯沸石

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 URL:
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Localities for Pollucite

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