摘要
The main mineralogical components of collophane are the apatite with trace amount C or low C and the francolite. The fine grained collophane is mainly composed of phosphatized organic clast and algal mat clast. The Early Cambrian phosphorite is formed by the comprehensive factors of biology, sedimentology, palaeogeography-palaeotectonics and phosphate shelf of Yangzi area.