china stone

noun

a type of kaolinized granitic rock containing unaltered plagioclase
any of certain limestones having a very fine grain and smooth texture

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Examples from the Web for china stone

Historical Examples of china stone

Semi-decomposed varieties of the granite are known as china-stone.
Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 4
Various