Petuntse

Petuntse (from Chinese: 白墩子; pinyin: báidūnzì), also spelled petunse and bai dunzi, baidunzi, is a historic term for a wide range of micaceous or feldspathic rocks.

The name means "little white bricks", referring to the form in which it was transported to the potteries (compare ball clay).

[12][13] According to one source, it is mixed with kaolin in proportions varying according to the grade of porcelain to be produced; equal quantities for the best and two thirds petuntse to one third kaolin for everyday ware.

[14] There were large deposits of high-quality stone in Jiangxi province in south-eastern China, which became a centre for porcelain production, especially in Jingdezhen ware.

[24][25][26] Relatively similar material to China stone has been mined, and exported to England for ceramics use, in the Isle of Man and Jersey.