250X BEI/ fine grained cherty sample. Pyrite, calcite, and other detrital phases constitute approximately 1-2% of the rock.
1000X BEI. The groundmass analyzes as mostly silica, with contamination by fine grained authigenic phases (framboidal pyrite, calcite). Detrital albite is the large grain. Note: vey fine porosity; unpenetrated by epoxy.
