Abstract
Properties determined.—Chemical composition, cone fusion temperatures, micro-structure in the raw state and after successive firings, and velocity of inversion on successive firings. Comparative burning behaviors.—After a single firing to 1435°C the German erratic block quartzites of the tertiary age show a much greater expansion than the American quartzites. Hessian quartzite resembles the American. Advantages of the German quartzites.—The use of the German erratic block quartzites for the manufacturing of silica brick of the highest quality is the more economical, both in preparation and burning costs, as compared with the American quartzites.
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