1 The strengths decrease in order crocidolite chrysotile, amosite.

2 Conclusion Amosite granular dust has the effects of causing carcinoma.

3 A method of identification for low content chrysotile, crocidolite and amosite in brake rubber of bicycle by the united way of polarized light microscope and X-ray diffraction had been established.

4 The three most important varieties are chrysotile, crocidolite and amosite.

5 The Air Pollution Control Ordinance bans the import and sale of the more potentially dangerous types of asbestos, namely amosite and crocidolite , from May 1996.