Otani undersea rock is volcanic ash and rock fusion precipitate solidified, stone unique to Japan, its light weight, multi-cavity, easy processing and as a senior decorative material has the following features: a good fire resistance 2 good insulation properties 3 . light weight, good seismic performance, stony soft, easy to process 4. deodorant, moisture, air purification 5. effective absorption of radioactive cesium Otani earthquake fire stone decoration is used on more and more like a spa hotel, bar, kitchen , bathroom, entrance, backdrop, decoration and so spend Otani stone, the use of more and more widespread, and even many Japanese restaurant and spa hotel will be renovated storefront Otani stone as a necessary material. However, such a good stone varieties in Japan, using basically only two reasons: First, in addition to Japanese, other countries, people still do not understand Otani stone; Second, the amount of the Japanese mainland has made Otani Stone basically in short supply state; Third, Japan's environmental protection laws are very strict, limiting the Otani stone mining and export channels. Thus creating a relatively high price Otani stone.