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|System:||Isometric||Colour:||Almost always colorless ...|
|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.|
Zeolite Group. Analcime-Pollucite Series. The cesium analogue of Analcime.
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Classification of Pollucite
|Strunz 8th edition ID:||8/J.27-20|
|Nickel-Strunz 10th (pending) edition ID:||9.GB.05|
9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
B : Chains of single connected 4-membered rings
|Dana 7th edition ID:||188.8.131.52|
|Dana 8th edition ID:||184.108.40.206|
77 : TECTOSILICATES Zeolites
1 : Zeolite group - True zeolites
|Hey's CIM Ref.:||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
|Type Locality:||La Speranza (Pisani's Quarry), San Piero in Campo, Campo nell'Elba, Elba Island, Livorno Province, Tuscany, Italy|
|Year of Discovery:||1846|
Physical Properties of Pollucite
|Lustre:||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|
|Comment:||Very brittle when compared with quartz; frequently shows splintery broken fragments|
|Density (measured):||2.9 g/cm3|
|Density (calculated):||2.96 g/cm3|
Crystallography of Pollucite
|Class (H-M):||m3m (4/m 3 2/m) - Hexoctahedral|
|Cell Parameters:||a = 13.67Å|
|Unit Cell Volume:||V 2 Å³|
|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:|
Radiation - Copper Kα
Data courtesy of RRUFF project at University of Arizona, used with permission.
|X-Ray Powder Diffraction:|
|Comments:||25-194; also 29-407 (synthetic material)|
Optical Data of Pollucite
|Comments:||Refractive index 1.508-1.528|
Chemical Properties of Pollucite
|Simplified for copy/paste:||(Cs,Na)2(Al2Si4O12)·2H2O|
|Essential elements:||Al, Cs, H, O, Si|
|All elements listed in formula:||Al, Cs, H, Na, O, Si|
Relationship of Pollucite to other Species
|Series:||Forms a series with Analcime (see here)|
|Member of:||Zeolite Group|
|Other Members of Group:|
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
|Related Minerals - Dana Grouping):|
Other Names for Pollucite
|Fluorescence in UV light:||Usually non-fluorescent, rarely may have a pale yellow fluorescence in SW UV.|
|Health Warning:||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
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
The 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.
(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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Locality Updated: Redondo, Évora District, PortugalFrom Rui Nunes, 28th Nov 2014 13:18:13