Chemistry of pulp and paper making . c-/ H :v--jr Plate 30 Talc. Magnification 100 diameters. Photographed by Bureau of Plate 31Asbestine. Magnification 100 diameters. Photographed byBureau of Standards. HEAVY SPAR AND WITHERITE 301 of talc will give the same results as 30 to 40 per cent of lowergrade china clay. Asbestine, or agalite, is a fibrous talc which occurs as an alter-ation product of tremolite. It is of American origin and is ex-tensively prepared in St. Lawrence County, N. Y. It is nearlypure (95 to 97 per cent) magnesium silicate and being in theform of rodlets attache


Chemistry of pulp and paper making . c-/ H :v--jr Plate 30 Talc. Magnification 100 diameters. Photographed by Bureau of Plate 31Asbestine. Magnification 100 diameters. Photographed byBureau of Standards. HEAVY SPAR AND WITHERITE 301 of talc will give the same results as 30 to 40 per cent of lowergrade china clay. Asbestine, or agalite, is a fibrous talc which occurs as an alter-ation product of tremolite. It is of American origin and is ex-tensively prepared in St. Lawrence County, N. Y. It is nearlypure (95 to 97 per cent) magnesium silicate and being in theform of rodlets attaches itself well to the fibres and gives goodretention. It does not impart quite so high a finish to thepaper as does talc. The best grades are free from sand, nearlyfree from iron and almost snow white. This material losesup to per cent on drying at 100° C. and from to 7 per centon ignition. The following analyses are fairly representative ofthe composition of asbestine or agalite. Silica, Si02 Alumina, AI2O3 Ferric oxide, FeaOs Manganese oxide, oxide, Magnesia, MgO Water 34-72 3-


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