Abstract
Transmission EM was used in an investigation of crocidolite asbestos [cause of asbestosis and mesothelioma] associated with 2 biological systems. Control material was defective and contained an abundance of Wadsley defects, (100) planar faults and pores. Fibers sectioned in lung tissue [human] and taken from in vitro exposure to blood serum showed erosion by 2 mechanisms-preferential attack at (100) planar defects and general surface dissolution.