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|System:||Orthorhombic||Colour:||Colourless, grey, pale ...|
|Hardness:||5 - 5½|
Zeolite Group. Natrolite Subgroup.
Paranatrolite is another natrolite analog with a high water content (Chao 1980; Ross et al. 1992).
Paranatrolite is reported to transform to tetranatrolite upon exposure to the atmosphere after removal from its aqueous environment (Chao 1980; Lee et al. 2006; Seryotkin & Bakakin, 2007).
The dehydration of paranatrolite to tetranatrolite has been believed to be irreversible, but Seryotkin & Bakakin (2007) showed that it can be reversible. Paranatrolite to tetranatrolite transformation is also reversible through pressure-induced hydration. Paranatrolite is indeed a distinct mineral species, which can be formed at high pressure either from natrolite or tetranatrolite with a stability field that varies with composition (Lee et al. 2006).
Classification of Paranatrolite
|Nickel-Strunz 10th (pending) edition ID:||9.GA.05|
9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
A : Zeolites with T5O10 Units – The Fibrous Zeolites
|Dana 8th edition ID:||18.104.22.168|
77 : TECTOSILICATES Zeolites
1 : Zeolite group - True zeolites
|Hey's CIM Ref.:||16.2.7|
16 : Silicates Containing Aluminum and other Metals
2 : Aluminosilicates of Na
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Type Occurrence of Paranatrolite
|Type Locality:||Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, Rouville RCM, Montérégie, Québec, Canada|
|Year of Discovery:||1980|
Physical Properties of Paranatrolite
|Colour:||Colourless, grey, pale yellow, pale pink|
|Hardness (Mohs):||5 - 5½|
Crystallography of Paranatrolite
|Cell Parameters:||a = 19.07(1) Å, b = 19.13(1) Å, c = 6.580(3) Å|
|Ratio:||a:b:c = 0.997 : 1 : 0.344|
|Unit Cell Volume:||V 2,400.44 Å³ (Calculated from Unit Cell)|
|Comment:||Probably monoclinic-pseudoorthorhombic; suggested possible space groups Fmm2, Fm2m, F2mm, F222 or Fmmm.|
Chemical Properties of Paranatrolite
|Essential elements:||Al, H, Na, O, Si|
|All elements listed in formula:||Al, H, Na, O, Si|
Relationship of Paranatrolite to other Species
|Member of:||Zeolite Group|
|Other Members of Group:|
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Paranatrolite
|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 Paranatrolite
Chao, G.Y. (1980) Paranatrolite, a new zeolite from Mont St-Hilaire, Québec. Canadian Mineralogist, 18, 85-88.
Khomyakov, A.P., G.Y. Cherepivskaya, and M.G. Mikheeva (1986): First paranatrolite finds in the USSR. Doklady Acad. Nauk SSSR, 288, 214-217 (in Russian).
ALBERTI, A., CRUCIANI, G., and DAURU, I. (1995) Order disorder in natrolite group minerals. European Journal of Mineralogy, 7, 501 508.
Evans, H.T., Konnert, J.A., and Ross, M. (2000) The crystal structure of tetranatrolite from Mont Saint-Hilaire, Québec, and its chemical and structural relationship to paranatrolite and gonnardite. American Mineralogist: 85: 1808-1815.
Seryotkin, Y.V., Bakakin, V.V., and Belitsky, I.A. (2004) The crystal structure of paranatrolite. European Journal of Mineralogy: 16: 545-550.
Lee, Y., Hriljac, J.H., Parise, J.B., and Vogt, T. (2005a) Pressure-induced stabilization of ordered paranatrolite: A new insight into the paranatrolite controversy. American Mineralogist: 90: 252-257.
Lee, Yongjae, Hriljac, Joseph A., Parise, John B., and Vogt, Thomas (2006) Pressure-induced hydration in zeolite tetranatrolite. American Mineralogist: 91: 247-251.
Seryotkin, Yu,V. & Bakakin, V.V. (2007): The reversibility of the paranatrolite-tetranatrolite transformation. European Journal of Mineralogy, 19, 593-598.
Internet Links for Paranatrolite
Localities for Paranatrolite
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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