抄録
A chabazite containing 1.40% of SrO was found in veinlets cutting a Permian basic albitized tuff on a limestone lens at Miyanohira, Ôme, Tokyo. It is optically biaxial negative with 2V=60°-70° ; α=1.489, γ=1.491, whereas the X-ray powder data are indexed with a hexagonal cell; a0=13.779 Å and c0=15.000 Å. The most probable source of strontium in this chabazite is a calcic plagioclase contained in the tuff before albitization, which released strontium as well as calcium and formed a sodic plagioclase.
