霊山玄武岩ジオート中のアラレ石

抄録

Aragonite crystals grown in the geodes of Ryozen basalts, Fukushima Prefecture, Japan, were described by means of optical microscope, chemical analysis and X-ray diffraction. The specimen consists of aggregate crystals and each crystal is prismatic, acicular and platy as shown in Fig. 2 and 3. The color of lower part of the crystal is white, the middle part is brownish or amber-like and the top transparent.