Abstract
Objectives: This study has been done to compare the Talcum's composition before and after using processing method and to clarify its quality and naming through the historical herbal books. Methods: I studied the Talcum and processed Talcum by physical and chemical method which contain microscopic analysis, X-ray diffraction analysis, thermal analysis, XRF, ICP, etc, to compare the compositions and its characters. Results: Talcum is a magnesium hydroxidfe(($Mg_3[Si_4O_{10}][OH]_2$)). Talcum contains a main ingredients of MgO 29.03-30.40%(31.70%), $SiO_2$ $62.00{\sim}62.40%(63.50%)$, $H_2O$ $4.40{\sim}4.85%(4.80%)$ and small ingredients, also. Conclusion: A radio-element contents of U, Th contain less than average contents of the lithosphere's U 1.8ppm, Th 7.2ppm. There are two sorts of Talcum which are a northern Talcum(solid Talcu) and southern Talcum(soft Talcum). A northern natural products of Talcum(solid Talcum) are used mostly in korea and china.