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6887534 
Journal Article 
Optical Properties of the Fibrous Amphiboles 
Wylie, AG 
1979 
330 
611-620 
English 
There are several fibrous varieties of clinoamphibole. The variety known as asbestos is characterized by a fibril structure: fibers close to the wave length of visible light in width, which share a common orientation parallel to the fiber axis, but which are disordered with respect to other crystallographic directions. The fibril structure produces anomolous optical properties: parallel extinction and only two indices of refraction. (100) twinning may also play a role in producing these optical effects. 
Clinoamphibole; Fiber content; Fibril Structure; Axis measurement; Crystallographic direction; Anomolous optical properties; Health & Safety Science Abstracts; Asbestos; H SE4.20:POISONS AND POISONING