It's truly sad that the regulators, representatives, and even the courts cannot get into the true chemical / physical nature of these different silicate minerals.  Even the World Health Organization (WHO) finds some asbestos minerals that do NOT cause asbestosis (but the laywers will never admit to this):

http://www.who.int/water_sanitation_health/dwq/asbestos.pdf

http://www.oit.org/ilolex/english/convdisp1.htm

http://www.oit.org/ilolex/english/recdisp1.htm

http://www.asbestos-institute.ca/media/who/who_090996.html

http://www.chrysotile.com/en/sc_publi/ipcs_report.aspx

http://www.who.int/en/