A group of compounds of silica, which is characterized by the presence of microscopic fibers that resemble needles, which are easily spread in the air inhaled and lead to a serious disease of lung cancer were published and Alocepctoses (Asbestosis). There are three main types of asbestos, white asbestos (chrysotile Chrysotile) and blue asbestos (crocidolite Crocidolite) and brown asbestos (Omusayt Amosite). Because the asbestos that is characterized by poor conductor of heat and electricity and is resistant to compression and tensile loads has been used widely in construction materials and thermal insulation materials and electrical insulation. But because of the many harms health has been banned from use in many countries.
