Smectite mainly came from the alteration of volcanic ash or volcanic glass and the weathering materials derived from land rocks.
蒙脱石除源于大陆派生的岩石风化物外，主要来自火山物质的蚀变。
2
Plasticss – Methods of Exposure to Direct Weathering, Indirect Weathering Using Glass filtered Daylight, and to Intensified Weathering by Daylight Using Fresnel Mirrors.