There are also some interesting charts of the elements found in Yixing pots in the two articles I mentioned here
(different methodology, but same idea).
The sample IDs are the same as in that post as well.
J. Wu, et al., An analysis of the chemical composition, performance and structure of China Yixing Zisha pottery from 1573 A.D. to 1911 A.D., Ceramics International (2012), http://dx.doi.org/10.1016/j.ceramint.2012.09.021
Study on Material Properties of Purple Pottery Clay in YiXing
Jiang Xia, Wu Juan, Zhang Maolin, Wu Junming, Li Qijiang, Yu Yongbin, Liang Duo, Fang Tao (Jing De Zhen Ceramic Institute, Jing De Zhen 333601 p21)
The interesting thing in this one is that, while it's probably just one sample per type, there is at least some sort of attempt to show the differences in composition between different types of clay.
There are some other charts / graphs in here, as well as a lot of text, but it's all in Chinese.