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Tetranatrolite from Mont St.Hilaire, Ouebeg

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Tetranatrolite from Mont St.Hilaire, Ouebeg Canadian Mineralogist Vol. 18, pp. 77-84 (1980) TETRANATROLITEFROM MONT ST.HILAIRE,OUEBEG T. T. CHBN* AND GEORGE Y. CHAO Departmentof Geology,Carleton University, Ottawa, Ontario KIS 586 AssrRlcr Sourvrerne 'onatrolite Tetranatrolite is a new name for "tetragonal Tetranatrolite est un synonyme de natrolite", a mineral first reported from Ilimaussaq, t6tragonale", nom sous lequel un min6ral fut d6crit Greenland by Andersen et aI. (L969). It is a wide- par Anderson et al. (1969) qui l'avaient trouv6 i spread constituent in the pegmatitic dykes and Ilimaussaq (Gro6nland). Ce min6ral est un consti- miaroles in the nepheline syenite at Mont St-Hilaire, tuant trBs r6pandu dans les dykes pegmatitiques Qu6bec, occuritrg most commonly as epitactic over- et dans les cavit6s miarolitiques de la sy6nite er growths on natrolite crystals and as small euhedral n6ph6line du mont St-Hilaire, dans la province de crystals or silky fibrous sprays on natrolite, anal- Qu6bec. Il se pr6sente le plus commun6ment sous cime or microcline. It occurs less commonly as forme d'enduits 6pitactiques sur cristaux de na$o- irregular earthy patches on natrolite or analcime. lite ou de petits cristaux idiomorphes ou encore The mineral is white, translucent to opaque with d'agr6gats de fibres soyeux sur natrolite, analcime vitreous to dull lustre. The hardness could not be ou microcline. Moins souvent, on le trouve en determined, and cleavage was not observed. The taches terreuses irr6gulidres sur natrolite ou anal- mineral is readily soluble in 1: I HCL slowly in cime. C'est un min6ral blanc, translucide b opaque, 1:1 HNOg and is only slightly attacked by 1:1 d'6clat vitreux i terne, dont la duret6 n'a pu 6tre H2SO4. Optically the mineral is uniaxial positive, . d6termin6e et otr nul clivage n'a 6t6 d6ce16.Il est 1.481 and e 1.496. Single-crystal photographs show facilement soluble dans 1:1 HCl, difficilement the mineral to be tetragonal, I42d or l41md,, a dans l:1 HNO' et d peine attaqu6 par 1:1 HrSOr. 13.098(2), c 6.635(2) A. Witn D*u 2,276 s/cm}, Optiquement, il est uniaxe positif, avec et 1.481 et a we find 2 - 4, whence Dcarc = 2.234 g/cmg. 1.496. I*s clich6s de_cristal unique r6vdlent sa Strongest lines in the powder X-ray-diffraction sym6trie t6tragonale, I42d ou l4rmd, a 13.098(2), pattern are 6.549(5 ) (2OO),5.9 12(4) ( l0 l ), 4.635 (4) c 6.635Q) A. Pour une densit6 mesur6e di, 2,276, (220), 4.387(5)(2rr), 4.r43(4)(310), 3.189(5) on trouve Z : 4, d'ot la densit6 calcul6e de 2.234, (32r), 2.867(10)(411),2.438(4)(43r); 1.816(4) Les raies les plus intenses du diagramme de poudre (640,413), 1.721(4)(730\. Electron-microprobe sont les suivantes:6.549(5)(200), 5.912(4)(101), analysis gave: SiO2 46.9, TiA2 0.06, Al,Os 25.6, 4.63s(4) (220), 4.387(s) (zrL\ , 4.143(4)(3LO) , CaO 1.48, MgO n.d., FeO 0.11, Na,O 14.0, K,O 3.189(5)(321), 2.867(10)(411), 2.438(4)(43r), 1.12, HzO+ (TGA to 1000"C), 9.59, H,O- (TGA 1.816(4) (640,413), 1.72L(4) (730). L'analyse i la to 135'C) 1.31, sum 100.18 (bv weieht). The microsonde 6lectronique donne: SiO, 46,9, TiOt analysis corresponds to (Nar.zsCoo.roKo.or)Feo.o,0.06, Al,O" 25.6, CaO 1.48, MgO n.d., FeO 0.11, Ai1.s5Si..n2O16.2.06HrOor, ideally, NarAlrSirOro' NagO 14.0,KrO 1.12,HrO+ (ATG jusqu'd 1000"C) 2HrO. A TGA curve shows a minor weight-loss 9.59,HrO (ATG jusquti 135o) 1.31,somme 100.18 between room temperature and 135"C and a major (en poids). Cette analyse donne la formule (Nar.r5 weight-loss between 135 and 435"C. The infrared Cao.roKo.os)Feo.orAlr.esSis.orO1o.2.06HrO ou id6ale- spectrum of the mineral strongly suggests (Si,Al) ment, NagAlgSLOm.2HrO. La courbe d'ATG mon- disorder. Hydrothermally the mineral decomposes tre une faible perte de poids entre la tempdrature to nepheline and analcine at 445oC and 1.0 kbar. ambiante et 135'C et une perte plus forte de 135 and to analcime at 330"C and 0.5 kbar. No change e 435'C. Le spectre infrarouge indique un d6sordre was observed at 265"C and 0.5 kbar. The mineral (Si,Al). La tdtranatrolite subit une d6composition is a dehydration product of a higher hydrate. hydrothermale en n6ph6line et analcime (445"C, 1.0 kbar), ou en analcime seulement (330'C, 0.5 Keywords: tetranatrolite, St-Hilaire, Qu6bec, natro- kbar); i 265'C et sous 0.5 kbar, on n'observe lite, pegmatite, epitactic overgrowth, Si,Al disorder, aucun changement. Ce min6ral provient de Ia nepheline syenite. d6shydratation d'un hydrate sup6rieur. (Traduit par la R6daction) *Present address: CANMET, 555 Booth Street, Mots-cl6s: t6tranatrolite, St-Hilaire, Qu6bec, natro- Ottawa,Ontario KIA OGl. Communicationsshould lite, pegmatite, enduit 6pitactigue, d6sordre, Si,Al, be addressedto GeorgeY. Chao. syenite n6ph6linique. 77 78 THE CANADIAN MINERALOGIST INtnoouctloN is apparently affected by the humidity of the immediate environment. The well-defined boun- A tetragonal analogue of natrolite was first daries between the altered crust and the trans- found in the albitite veins cutting the naujaite parent core material are either smooth or inclusions in lujavrite in the westernmost part irregular surfaces, apparently without transi- of Tugtup Agtakorfia, Greenland, and was tional zones (Figs. l, 2). When the crust described by Andersen et al. (1969). The min- material is removed, the freshly exposed trans- eral was found as aggregatesof sheaf-like groups parent core material does not show sign of of small prismatic crystals, each of which dis- further alteration during a period of more than played a single prism and either a pinacoid or a year under similar conditions. The freshly a dipyramid. The mineral was reported as com- collected material may be preserved in water, monly associated with aegirine, analcime, na- but the altered crust material does not recover trolite, sodalite, epistolite, schizolite, lepidolite, its transparency after being immersed in water sphalerite and a number of beryllium minerals. for several months. The X-ray powderdiffraction pattern of the Studies of this alteration material from Mont mineral was similar to that of natrolite but St"Hilaire by the present authors show that it could be indexed on the basis of a body-centred is a tetragonal dimorph of natrolite, similar in tetragonal cell with a 13.O43,c 6.619 A. fne compsition and physical properties to the optical properties of the mineral were also tetragonal natrolite from Greenland reported found to be consistent with those for a uniaxial by Andersen et aI. (1969). The name tetrana- mineral. Andersen et al. made no attempt to tolite was proposed for this mineral jointly by name this mineral at that time. the present authors with Dr. Andersen and his In studies of the minerals from Mont St- associates.The mineral and its name were ap- Hilaire, Qu6bec, it has been frequently noted proved by the Commission on . New Minerals that crystals of a variety of natrolite, usually and Mineral Names, I.M.A. Type specimens well formed and transparent when first col- from Mont St-Hilaire are preserved at the lected, alter after short exposureto air, produc- National Museum of Natural Sciences,Ottawa ing a white, translucent to opaque, friable and (37131) and at the Royal Ontario Museum, somewhat porous crust. The rate of alteration Toronto (M35545). A specimen of the mineral Fro. 1. Tetranatrolite overgrowths on natrolite crystals (3 mm across) from Mont St-Hilaire. Frc. 2. Tetranatrolite overgrowth o! a tratrolite crystal with a portion of tetranatrolite removed, showing sbarp boundaries. Cross-sectionof crystal: 3 mm. TETRANATROLITE FROM MoNT sr-HrLArRE,eu6BEc 79 from llimaussaq, Greenland, an ideotype, is readily in 1:1 HCI and slowly iq 1:1 HNOa also deposited with the Royal Ontario Museum with gelatinous residues; it is only slightly at- (M36rcq. tacked by 1: I HzSO4. The optical properties of tetranatrolite and OccunnaNce AND PHySIcAL PnopsntrEs the associatednatrolite, summarized in Table 1, were obtained from crystal fragments previously Tetranatrolite is a widespread constituent in oriented by X-ray goniometry using a spindle the pegmatite dykes and miarolitic cavities in stage and sodium light. All refractive-index the nepheline syenite at Mont St-Hilaire, and liquids used were checked using an Abb6 re- is closely associatedwith natrolite, microcline, fractometer. The maximum and minimum in- analcime, aegirine and a variety of accessory dices of refraction for tetranatrolite from Mont minerals. The mineral ocsurs most commonly St-Hilaire are slightly higher than those for the as a friable crust up to 1 mm thick on natrolite material from Greenland and are significantly crystals of various sizes (Fig. 1) and as small higher than those for natrolite from Mont St- euhedral crystals (0.1 mm) or fine, silky fibrous Hilaire and the Green River Formation, Colo- sprays on larger crystals of natrolite, analcime rado (Table 1). Composite tetranatrolite-na- and microcline. It occurs less commonly as trolite crystals show optical continuity in thin irregular, earthy patches on massive natrolite section, with the e direction of tetranatrolite and analcime. Tetranatrolite-coated natrolite parallel to the Z principal vibration direction crystals are very simple in habit, as is typical of natrolite, suggestingan epitactic relationship of natrolite crystals from this locality, display- between the two minerals.
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