Black pebbles in Chajiang River. The local people of black pebble are also called bug's eye stone, while the outsiders are called "black pearl" or "rubbing stone". This kind of stone is unique because of its blackness, high hardness, delicate texture and rich charm. In addition, it also produces graphic stones, whose hardness and texture are similar to those of black pebbles, and the color of patterns changes greatly, which is quite distinct, especially the stone species known by local people as golden grain stones and flower pebbles.
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