Songhua stone also known as Songhua jade, produced in the northeast of Changbai Mountain District China Chinese Songhua stone town - the river source area is argillaceous sedimentary rock facies. Songhua stone is the deposition of fine mud seabed hundreds of millions of years ago marine movement in the process, through the limestone type sedimentary deposition, hard cover, pressing, physical process of the formation of microcrystalline. The basic composition of the mineral is calcite, quartz, mica,: clay and a small amount of metal minerals. Non-toxic, tasteless and Songhua stone, no radiation, rich color, delicate texture, mineral resources are scarce, not only can be used in practical and ornamental carving inkstone, can also be used as decorative materials and the processing crafts building expensive. In the folk is rife with great treasure is said to do.

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