二)次生矿物 secondary minerals 3次生矿物主要类型 Clay Film Secondary minerals 1. Clay minerals- hydrous aluminosilicates with layer structures similar to mica a. six main types; examined in greater detail in unit 6 2. Oxides, hydroxides, or oxyhydroxides of Si, Al, and Fe. a, secondary silica; chert, flint Sic b. gibbsite A(OH)3 C.goethite; limonite FeO(oh d, hematite Fe,o 3. Carbonates a, calcite CaCO b. dolomite CaMg(CO3)2 4. Sulfates a. gypsum 5. Phosphates- rock phosphate a. apatite; fluor,chlor-,or hydroxy- Ca3(PO4 )3(F, C1, OH)（二） 次生矿物 secondary minerals 3.次生矿物主要类型