Chrysotile
Chrysotile or white asbestos is the most commonly encountered form of asbestos, accounting for approximately 95% of the asbestos in the United States and a similar proportion in other countries. Wikipedia
Colour: White to greyish green
Birefringence: 0.001 (max)
Crystal class: Clinochrysotile: prismatic (2/m); Orthochrysotile and parachrysotile: pyramidal (mm2)
Crystal habit: Acicular
Crystal system: Monoclinic: clinochrysotile (most common); Orthorhombic: orthochrysotile and parachrysotile (both rare)
Density: 2.53 g/ml
Diaphaneity: Translucent