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Tous les autres exemplaires originaux sont filmAs en commenpant par la premiere page qui comporte une empreinte d'impression ou d'illustration et en terminant par la derni^re page qui comporte une telle empreinte. Un des symboles suivants apparaftra sur la derniAre image de cheque microfiche, selon le cas: le symbols -♦• signifie "A SUIVRE", le symbols V signifie "FIN". Les cartes, planches, tableaux, etc.. peuvent dtre film«s A des taux de reduction diff«rents. Lorsque le document est trop grand pour dtre reproduit en un seul cliche, il est film6 d partir de I'angle superior ir gauche, de gauche A droite, et de haut en bas, 6:1 prenant le nombre d'images ndcessaire. Les diagrammes suivants illustrent la m^lthode. 1 2 3 1 2 3 4 5 6 From the Philosophical Magazine for May 1S55. NOTE ON THE MINERAL WILSONITE. BY T. S. HUNT, OP THE GEOLOGICAL COMMISSION OF CANADA. TN the Supplementary Number of this Magazine for July J- 1854, p. 499, I published descriptions and analyses of two minerals occurring in crystalline limestone in Bathurst, C.W., one of which I proposed as a new species with the name of Wil- sonite. It was described as forming rose-red, translucent, clea- vable masses, probably monoclinic in crystallization, with a hard- ness of 3-5, and a density of 2765 to 2-776. Lustre vitreous, shining occasionally, pearly on the cleavage surfaces. One of three analyses gave silica, 43-55 ; aluminn, 27-94; oxides of iron and manganese, -20 ; lime, 6-50 ; magnesia, 3-81 ; potash, 8-37 ; soda, -95 ; water (loss by ignition), 8-61 = 99-93. With two other specimens the amounts of silica, alumina, magnesia, and alkalies were very nearly the same, while the loss by ignition was 9-40 and 9-00, and the amounts of lime respectively 6-94 and 6-72. The subsequent examination of more perfect specimens in the possession of Prof. E. J. Chapman has shown him that this mineral is triclinic, with inclination to the right, and he has kindly furnished the following notes : — " I give you as approxi- mations, the following angles from cleavage faces by the common goniometer:— P:T=: 94°; P : er=145°; T : e=129°; P : M and T: M = 110° to 115°. Cleavage with P and T perfect, less so with M ; the cleavage with e is not easily obtained, but is very distinct and even. Hardness, 3"5 on the more facile clcavagea and their combination edges; 5"5 on the ends of the prismatic concretions. Density, 2*77." ; Prof. Chapmaij also pointed out to me the existence of inter- mingled carbonate of lime in the specimens which I had previ- ously analysed, and showed that the loss by ignition was in part carbonic acid. I have since found that the finely pulverized mineral yields up nearly the whole of its lime with effervescence to cold dilute hydrochloric acid, which does not attack the sili- cate. This still retains its rose colour, and is a hydrous silicate of alumina and potash with a little magnesia. The following are the results of the analyses by myself of two specimens, purified by dilute acid (one being from the same mass as the one given above), and a partial analysis of a third specimen by Prof. H. Croft, which he has kindly communicated to me. I. II. III. Silica .... 47-50 47-70 47-42 Alumina . . . 3117 31-22\ r34-80 4-14J \ -73 Magnesia . . . 4-25 Lime .... 1-51 •39 -42 Potash .... 9-22 9-38 Soda .... •82 •95 Water (by ignition) 5-50 5-35 99-97 99^13 The mineral freed from carbonate of lime seems to be constant in composition ; and from its crystallization and density, as well from its chemical constitution, to pertain to the felspars. Montreal, March 22, 1855.