抄録
The undivided Paleozoic Rocks which are composed of the chert, slate and schalstein are distributed in the south-western mountains of Nikko City, Tocigi Pretecture and these rocks are intruded by the big mass of granite and quartzporphyry. The writer has surveyed the area in March, 1966 and found the white minerals like zeolites occuring in these Paleozoic Rocks. These white minerals are occured in the fissure-vein and druse of low metamorphic sand stones and schalstein. From the result of X-ray diffraction analysis and differential thermal analysis of purified mineralis by magnetic separation and heavy liquid separation, it is cleared that they. must be the well crystallized stilbite and laumontite. The discovery of zeolite from the Paleozoic Rocks is considered to be a rare example in Japan.
