Dry bulk densities for various rock types

rock type number of samples mean (grams per cubic cm) standard deviation mode (grams per cubic cm) median (grams per cubic cm)

all rocks 1,647 2.73 0.26 2.65 2.86

andesite 197 2.65 0.13 2.58 2.66

basalt 323 2.74 0.47 2.88 2.87

diorite 68 2.86 0.12 2.89 2.87

dolerite (diabase) 224 2.89 0.13 2.96 2.90

gabbro 98 2.95 0.14 2.99 2.97

granite 334 2.66 0.06 2.66 2.66

quartz porphyry 76 2.62 0.06 2.60 2.62

rhyolite 94 2.51 0.13 2.60 2.49

syenite 93 2.70 0.10 2.67 2.68

trachyte 71 2.57 0.10 2.62 2.57

sandstone 107 2.22 0.23 2.22 2.22

Source: After data from H.S. Washington (1917) and R.J. Piersol, L.E. Workman, and M.C. Watson (1940) as compiled by Gary R. Olhoeft and Gordon R. Johnson in Robert S. Carmichael, ed., Handbook of Physical Properties of Rocks, vol. III, CRC Press, Inc. (1984).