Bicchulite is a very rare calcium silicate and this very rich and showy specimen is from the Type Locality - the Fuka Mine of Japan. Sharp, gray, rectangular crystals to 4 mm of bicchulite pseudomorphs after gehlenite crystals richly cover the quartz-rich matrix on this specimen. Gehlenite is also a very rare calcium silicate. The Fuka Mine recovered high grade calcite for the toothpaste industry and is noted for interesting high temperature boron species.