00532nam a2200181 a 450000500170000002000150001708200170003210000380004924500700008726000250015730000210018269000150020369000100021896400190022899700180024799900170026595200680028220251203091902.0  a0521344441  a553,bD, die  aDietrich, R.V., Skinner, Brian J.  aGems, granites and gravels : knowing and using rocks and minerals  aCambridgebCUPc1990  aviii, 174p, 24cm  aMineralogy  aRocks  bengcdefg_  a74536 LIBSC C  c56233d56233  00104070aPUbPUd1998-04-08g7.99l0o553, D, diep74536yBK