Product         photo
¡¾Tourmaline(BiXi)¡¿  Photo
¡¾Vermiculite¡¿  Photo
¡¾Datang jade picture¡¿  Photo
¡¾Quartz sand¡¿  Photo
¡¾Ceramic granule¡¿  Photo
¡¾Metal Magnesium granule¡¿  Photo
¡¾Dolomit¡¿  Photo
¡¾Obsidian¡¿  Photo
¡¾Jade Cobble¡¿  Photo
¡¾Jade Plates¡¿  Photo
¡¾OEM¡¿  Photo

Obsidian is a kind of volcanic rock. Its main composition is SiO2 and it is a kind of natural glass formed by rapidly cooled volcanic lava. It is mainly used in handicraft, gem, building materials, refractory material and so on. Under high temperature, it can expand by over 20 times. The color is milky white, and is used in building industry.