Type... Domestic Mineral These are 6 rocks with ferroelectric tourmaline collected from the mountains of Katsurabatake, Misato-cho, Tsu City, Mie Prefecture. The ferroelectric tourmaline found in the Ryoke granite within the Ryoke metamorphic belt on the geological map is often small, short prismatic, or granular (see photos). They are not large or magnificent specimens. The mother rocks are small stones, ranging from 1 cm to 4 cm on each side, totaling 6 pieces. The total weight is about 100g. A case is not included. When shipping, each stone will be placed in a poly bag and then packed in a padded box with cushioning material. We ask for your consideration if you are interested.