United States or British Virgin Islands ? Vote for the TOP Country of the Week !
2-Quartz Biotite Schist. Contact between above dike and amphibolite. A coarse black rock carrying magnetite and pyrites in considerable quantities. Under the microscope some of the biotite has a green coloration from decomposition and is surrounded by strong pleochroic halos. Small grains of secondary pyroxene are numerous. 3-Grand Lake.
Word Of The Day