Chao and Ruoff [*] have shown previously that by precompressing pyrophyllite prior to its use in high-pressure applications, one obtains a material which has a uniform density and uniform mechanical properties. We have recently studied the propagation of ultrasonic puises in pyrophyllite specimens to investigate the effect of specimen precompression on the measured elastic moduli. Measurements were made at room pressure and, for the precom-pressed specimens, to pressures of 3 kbar.nWe find pyrophyllite to be elastically anisotropic, apparently the result of the fabric present 1n our material. The room pressure adiabatic bulk modu¬lus as measured on specimens made of isostatically compacted powdered pyrophyllite was determined to be 96.1 kbar.
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