. The Canadian journal of industry, science and art. MINERALS AND GEOLOGY OF CANADA. 531 forms, when polished, a haadsome (though opaque) stone, fit for rings and hrooches. In some directions, a slight chatoyance is observable. Datolite.âChiefly pale green or colourless, in botryoidal and fibrous masses, and in monoclinic crystals. H. 5-0-5"5 ; sp. gr. 2*95- 3'0. Fusible with bubbling ; imparting a greenish tint to the flame 'â > and yielding in the bulb-tube about 5 or 6 per cent, of water. Com- position : silica, boracic acid, lime, and water. Occurs with prehnite, laumonite, &c.
. The Canadian journal of industry, science and art. MINERALS AND GEOLOGY OF CANADA. 531 forms, when polished, a haadsome (though opaque) stone, fit for rings and hrooches. In some directions, a slight chatoyance is observable. Datolite.âChiefly pale green or colourless, in botryoidal and fibrous masses, and in monoclinic crystals. H. 5-0-5"5 ; sp. gr. 2*95- 3'0. Fusible with bubbling ; imparting a greenish tint to the flame 'â > and yielding in the bulb-tube about 5 or 6 per cent, of water. Com- position : silica, boracic acid, lime, and water. Occurs with prehnite, laumonite, &c., in association with the traps of the north shores of Lakes Huron and Superior. Fine crystals are found at Isle Royale, and on the south shore of Lake Superior, in the copper region. Thomsonite.âChiefly in white or light-coloured acicular crystals and fibrous masses, in (or connected with) the traps of Lakes Huron and Superior. H. 5"0-5"5 ; sp. gr. 2"3-2-4. Fusible, with previous in- tumescence. If free from weathering, in which case it will be trans- lucent, it yields about 13 per cent, of water in the bulb-tube. Compo- sition : silica, alumina, lime, soda, and water. Analcime.âChiefly in trapezohedrons (fig. 45,) of a white or greyish colour, associated with the traps of Michipicoten Island and the shores of Lakes Huron and Superior. H. 5'0-5*5 ; sp. gr, 2-0-2'l. Fusible quietly, id est, without intumescence or bubbling. Yields in the bulb-tube from 8 to 9 per cent, of water. ^^s- 46. Composition: essentially, silica, alumina, soda, water. Apophyllite.âIn lamellar masses and dimetric pyramidal crystals of a white or light colour, with pearly opalescence on the top or basal plane. H. 45-5-0; 2-32-2-37. Exfoliates before the blow- pipe and fuses with bubbling. In the bulb-tube, yields about 16 per cent, of water. Composition : silica, lime, potash, and water. Found here and there in connection with the traps of Lakes Huron and Superior. Fine crystals
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Keywords: ., bookcentury1800, bookdecade1850, bookpublishertoron, bookyear1856
