An Explanation for the Provincial Standard of Larderite

The Fujian provincial bureau of quality and technical supervision recently published aprovincial standard of the product of geographical indication－Larderite(DB35/T 419－2012).This paper explains the drafting process and its key contents and it also provides detailed explanations on features of larderite and on classification and identification methods of larderite adopted in this new standard.The larderite is divided into four groups：Tianhuan stone group，Gaoshan stone group，Furong stone group and Wenyang stone group.Gaoshan stone group is composed of kaolinite minerals，Furong stone group is composed of pyrophyllite and Wenyang stone group is composed of illite.Tianhuang stone group is the product of larderite being transported and buried.These groups can be identified by their relative densities and near－infrared spectra with ease.