History of Technology in India, Vol. I: From Antiquity to c. 1200 A.D. v1.c17.s3.t1.6

v1.c17.s3.t1.6

running across this bundle. The stone is usually cut along this direction so that maximum number of light-reflecting cavities are close to or on the surface, producing maximum chatoyancy. Quartz cat’s eye samples (hardness 7) show similar chatoyancy or a wave of milky light reflected from the surface, the effect in this case arising due to the presence of large number of fibres of asbestos aligned in a specific direction.