New silicate rock reference materials issued from the Geological Survey of Japan, 1984

New silicate rock reference the Geological Survey materials issued of Japan, 1984 from The Geological Survey of Japan is processing a series of geochemical rock samples to be issued as reference materials for major, minor and trace elements, isotopic compositions, geological ages and physical constants.Granodiorite JG-l was prepared in 1967 and basalt JB-1 in 1968.The supply of these two rocks, however, became exhausted in 1981, after settlement of 75 analytical components.