%^ w IMAGE EVALUATION TEST TARGET (MT-S) / O 4,7* #j ^ A, 0L>r 1.0 I.I 1.25 ■ 50 "^^ 2.5 2.2 1-4 11.6 V] (^ /^/ "cr-l % c^: C '^ > ^^ '^ O / Hiotographic Sciences Corporation 23 WEST MAIN STREET WEBSTER, N.Y. i4580 (716) 679-4503 i^. ^^5 CIHM/ICMH Microfiche Series. CIHM/ICMH Collection de microfiches. Canadian Institute for Historical Microreproductions / Institut Canadian de microreproductions historiques ^ Technical and Bibliographic Notes/Notes techniques et bibliographiques The Institute has attempted to obtain the best original copy available fur filming. Features of this copy which may be bibliographically unique, which may alter any of the images in the reproduction, or which may significantly change the usual method of filming, are checked below. L'Institut a microfilm^ le me'lSeur exemplaire qu'il lui a dt6 possible de se procurer. 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Un des symboles suivants apparaftra sur la dernidre image de chaque microfiche, selon le cas: le symbole — ► signifie "A SUIVRE", le symbols V signifie "FIN". Les cartes, planches, tableaux, etc., peuvent Stre film6s d des taux de reduction diff^rents. Lorsque le document est trop grand pour dtre reproduit en un seul clich6, il est 1\\m6 d partir de I'angle sup^rieur gauche, de gauche d droite, et de haut en bas, en prenant le nombre d'images ndcessaire. Les diagrammes suivants illustrent la mdthode. 1 2 3 1 2 3 4 5 6 mwa^mBM K N >',-f '.'■'';■ *";. ,Vi" ■ '^'-^- / f c^ \ ON THE CHRYSOTILE FROM SHIPTON, CANADA. By Euastus G. Smith, Ph.D., Chemical Laboratory of Beloit College, Bcloit. Wisconsin. • • I • • • •• .* • « • • • • • ..-.• •.^':•.•;•^:. • I II » J 1 [FliOM THK AMEHIOAN JOURNAL OF SCIENCE, VoL. XXIX, JAN., 1885.] Art. VIII. — On the Chrysotile from Slnpton^ Canada; by Erastus G. Smith, PhD. There has recently come into my possession, through the Isindness of Mr. W. H. Jeffreys of Richmond, several specimens ot the fibrous variety of serpentine or chrysotile from the above named locality. So well cliaracterized were the speci- mens, and diligent search failing to discover any analyses or description of the properties of the mineral from this locality, an examination was instituted with results appended below. Serpentine is commonly met with through many portions of the Province of Quebec, occurring either as large deposits of the comparatively pure mineral or more generally mixed with other minerals, notably calcite and chromite. Chromite espe- cially appears to be almost always present in the serpentine of the Silurian rocks. The fibrous variety of serpentine or chrysotile generally spoken of as "asbestus," appears to be distributed also in abnost unlimited quantities through many of the southeastern townships, notably at Thetford and Coleraine. (See Report of Geological Survey of Canada, 1881-82, G.G., pp. 6-8). The chrysotile from Shipton seems to be of much the same character both in appearance and mode of occurrence. It occurs in narrow veins of from one to four inches in width traversing the solid serpentine. These veins possess little or no regularity, often abruptly terminating. The fibers run trans- versely, improving in quality as the mineral recedes from the surface of the ground. In appearance the chrysotile has a fine silky luster, varying in color from a deep green to a pale yel- low. The fibers can be easily separated from each other, form- ing a soft voluminous wool-like mass. Before the blow-pipe it is fusible only with the very finest fibers. It yields water readily on ignition, being at first blackened and finally assum- ing a dull brown color, "^he ignited mass loses its fibrous character and crumbles easily beneath the fingers. The reaction for iron is always marked and with some specimens that for chromium also, though as will be noticed, the particular specimens analyzed gave no chromium reaction. This varia- ble reaction is accounted for by the fugitive presence of chromite in the vicinity, which as already noted, so often accompanies the Canada serpentines. Two specimens were selected for analysis : I. Dark green, sp. gr. 2-142 (temp. 16° C). II. Pale yellow, sp. gr. 2-286 (temp. 16° C). I ::i «• , • t . • • • • • • • • »•• • • .' I E. G, Smith — Chrysot'de froin Shi2)ton^ Canada. 33 I. II. SiO'.' 41-837 42-043 i\o 2-2b4 3-663 MiiO 41-990 39-540 II.O 14-282 14-309 100-343 99-555 These anal3^ses establish clearly the identity of this mineral with the chrysotile from other localities, as can be readily con- firmed by comparing them with the analyses already published. Clicniical Laboratory of Beloit College, Boloit, Wisconsin, Nov. 28, 1884. •i ■ J I. .'.^1