Abstract
The retentive properties for helium of various minerals are of both mineralogical and geological importance. Since the degree of retention of helium is generally appreciable and helium is present in different concentrations in different rock‐minerals, the rate of migration of helium through minerals must be extremely slow, even with respect to geological time. An excellent mechanism is thus available for studying the effects of geological processes upon the internal structures of minerals.During the past two years about 80 mineral‐samples have been studied in the writer's laboratory in order to find the variations in helium retentivity with divers crystal structures and with changes in geological environment.
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