Annual report . is locality and is therefore an older rock. Theolder porphyritic rock is syenite porphyry, containing, under the microscope,phenocrysts of orthoclase with zonal structure and numerous hornblende crystals in 1920
Bulletin . gnizable in the hand specimen. Microscopic study shows that the principal mineral constituents in theorder of their relative abundance are quartz, sericite, feldspar, chlorite,and carbonate (calcite ?). The textural
Typical alteration of Baomai deposit (a) kaolinite in the fracture of... | Download Scientific Diagram