Table 1 09 

 COMPRESSIBILITY OF CRYSTALS 



'57 



* These symbols relate to the corresponding trigonal, tetragonal, hexagonal, axes respectively. t Transition 

 above 9000°. Data from Bridgman, Amer. Journ. Sci., 10, Dec, 1925; 15, Apr., 1928. Unit of pressure kg/cm 2 . 

 The following additional crystal volume compressibilities have been taken from Madelung, Fuchs. Ann. Phys., 

 65. 305, 1921. Their unit of pressure is dynes X io 6 per cm 2 at o°C. 1 dyne/cm 2 equals 1.020 X io -6 kg/cm 2 . 



Sylvite, KC1 5.62 



Halite, NaCl 4.14 



AgNo3 3.67 



Bismuthinite, BiiSa 3.31 



Argentite, Ag2S 3.00 



Gypsum 2.52 



Witherite, BaCCh 2.02 



Anglesite, PbSOi (1.93) 



Cerusite, PbCC>3 1.90 



Andularia, KcAhSieOie 1.79 



Smithsonian Tables 



Anhydrite, CaSCi 1.76 



Strontianite, SrCCh 1.74 



Aragonite, CaC03 1.53 



Rhodocrosite, MnCC>3 1.3 



Chalcopyrite, CuFeSs 1.28 



Dolomite, CaC03MgC03. .. . 1.21 



Hematite, Fe2C>3 1.08 



Siderite, FeCC>3 0.99 



Zircon, SiC>2ZnCh 0.85 



Marcasite, FeS2 0.81 



Zincite, ZnO 0.77 



Periclase, MgO 0.71 



Hematite (specular) 0.59 



Rutile, Ti0 2 0.58 



Ilmenite, (FeTi)2C»3 0.55 



Cassiterite, SnO 0.48 



Sapphire 0.43 



Corundum, AI2O3 0.38 



