Elastic behaviour of quartzite and fused quartz
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The velocities of an ultra-sonic wave are determined along three orthogonal directions in quartzite and from them the effective elastic constants are calculated. For comparison, the same have been determined in a plate of fused quartz. The velocities and the elastic constants in quartzite come out to be the same in the three directions. Further, the velocity in fused quartz is found to be very nearly equal to that in quartzite. It is therefore inferred that the orientation of quartz grains is random in quartzite.