Japanese Mingshi Fire-resistant Stone Bead Chain-10mm

What is a Japanese Ming Stone?
according to According to the regulations of the Japan Mingshi Association, stones produced in various parts of Japan are registered in On the list of famous stones, these stones are minerals with "overall appeal as stones" and should be shared around the world in terms of origin, history, color, structure, etc.

The fire-resistant stone is a type of biotite stone produced from Niijima Island in the Izu Islands of Tokyo, and was formed by an eruption 886 years ago. It is a porous pumice stone that can be cut easily with a saw or axe. It is used for many purposes due to its advantages such as light weight, fire resistance, heat insulation and acid resistance. Fire-resistant stone is a rare stone found only on the Italian islands of Lipari and Isola Nova.