00000nam a2200000 a 4500 20251203091902.0 0521344441 553, D, die Dietrich, R.V., Skinner, Brian J. Gems, granites and gravels : knowing and using rocks and minerals Cambridge CUP 1990 viii, 174p, 24cm Mineralogy Rocks eng _ 74536 LIBSC C 56233 56233 0 0 0 0 PU PU 1998-04-08 7.99 0 553, D, die 74536 BK