Home HIGH-PRESSURE CRYSTAL-CHEMISTRY OF PHENAKITE (BE2SIO4) AND BERTRANDITE (BE4SI2O7(OH)2) HIGH-PRESSURE CRYSTAL-CHEMISTRY OF PHENAKITE (BE2SIO4) AND BERTRANDITE (BE4SI2O7(OH)2) HAZEN, RM; AU, AY 1986 PHYSICS AND CHEMISTRY OF MINERALS