Product Description

Rock Type:  Chloritized biotitite

Location:  Brazil

Description:  Biotite grains (orange-yellow) have been chloritized (green) along grain margins and cleavage planes.  The coarse biotite-phlogopite solid solution grains make-up 70% of the thin section.  They commonly contain fine-grained ilmenite grains (black) and ilmenite development along cleavage planes.  Chloritized biotite with Fe-Ti liberated during retrogression to form clots of coarse-grained ilmenite.  The rock was studied for its titanium-vanadium potential.