. The Nepheline and Associated Alkali Syenites of Eastern Ontario . o very palebluish, the colour fading rapidly when exposed to the action of theweather. It is susceptible of a high polish and is emmently suitable forinside decorative work. It is often associated with more or less magnetiteand biotite, and displays veinlets of reddish and whitish feldspar whichwas shown on analysis by Dr. Harrington to be orthoclase. A samplein the museum of the Geological Survey shows a crystal of hastingsiteseveral inches in length and perfectly terminated, completely enclosed inthe sodalite. Most of the ma
. The Nepheline and Associated Alkali Syenites of Eastern Ontario . o very palebluish, the colour fading rapidly when exposed to the action of theweather. It is susceptible of a high polish and is emmently suitable forinside decorative work. It is often associated with more or less magnetiteand biotite, and displays veinlets of reddish and whitish feldspar whichwas shown on analysis by Dr. Harrington to be orthoclase. A samplein the museum of the Geological Survey shows a crystal of hastingsiteseveral inches in length and perfectly terminated, completely enclosed inthe sodalite. Most of the material is compact with a multitude of ver\fine cracks which may bo due to the shocks of blasting. The specimenselected by Dr. Harrington for analysis showed distinct dodeoahcdralcleavage and vitreous lustre. It was translucent and often sub-trans-parent in ordinarily thin fragments, and its hardness was about in a closed tube the sodalite became perfectly white, while be-fore the blowpipe ii fui^ed en«ily with intumescence to a colourless glass. ?-^. J ^ c j:— o > IT [ADAMS & BARLowJ ALKALI SYENITES OF EASTERN ONTARIO 17 Under I is given an analysis of tiie sodalite from lot 2i), concession XIVof Dungannon, by Dr. B. J. Harrington.^ Under 11 an analysis ofsodalite from Duugannon by L. McI. Leigher and G. J. \olckenning. .Al, .Na20. .K^ . .. ..H^ .Insoluble. 1. II. .20 .79 .74 .38 .13 .37 .80 Deducting 0 = CISpecific gravity = Gancriniie.—This mineral was first detected in Canada by Dr. Har-ring^ton in the nepheline syenites of Mount Koyal and Beloeil, in theProvince of Quebec.^ In the nepheline syenites of Ontario, it usuallycan only be distinguished by the assistance of the microscope. It occurs inirregular grains or rude radial aggregates, whose outlines are dependenton the surrounding minerals. It is usually at least in immediate associa-tion wi
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