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
Figure 6 | Geology, alteration and lithogeochemistry of the Paleoproterozoic Korpela VMS occurrence in Eastern Finland | SpringerLink
Rocks Under a Microscope
39631 Porphyry, altered (quartz-sericite)
. 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 characteristics and mineral com ...
Rocks Under a Microscope
ALEX STREKEISEN-Sericite-
Examples of contrasting ore styles within sericite-altered Golden Mile... | Download Scientific Diagram