Chrysotile (Silacate-Sheet Silicate) 

Mg6Si4O10(OH)8

Hardness: 3.0 - 5.0
Specific Gravity: 2.5 - 2.6

Characteristics: Asbestos, breathing of fibers is a possible carcinogen; usually green to white; fibrous serpentine; no cleavage and uneven fracture; greasy, waxy luster; translucent; dissolves in strong acids.

Found in serpentinites and altered ultramafic rocks.

(Primary text: Perkins, D. 2002. Mineralogy. Prentice Hall.)