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Actinolite Amosite amphibole Anthophyllite breaks asbestiform minerals asbestos Bolivian Crocidolite Fiber bons Bragg reflections break into fragments brittle Bureau of Mines chrysotile Clay County collodion membrane croscope cross section Dark streaks density Diagram to Illustrate diameter difference between Bolivian dispersed dolite doughnut picture electron beam electron micrograph shows electron microscopic study eral evaporated fiber breaks fiber of croci fibers are actually fibrous Figure 24 flexible ribbons Halloysite Tube Huggins Illustrate Cross-Sectional indicated tubular structure iron oxide laths layer length light microscope long ribbons measured MICROGRAPHS OF ASBESTIFORM Monoclinic Montasite N.C. Magnification 7,000 natural inorganic oriented for Bragg parabolic shadow perfect alinement Picrolite point source Polystyrene latex balls principle of shadow produce a doughnut reflections and appear ribbon structure round shadow samples shadow casting shadow the end shown in fig single fibers slightly wrinkled South Africa terial thickness thin sheets Tremolite Tubular Fiber tubular structure existed two-tenths micron Ultrasonic visible