Product Description

Rock Type:  Quartz-muscovite-garnet metasediment

Location:  Guyana, South America

Description:  The medium-grained

quartz demonstrates undulose extinction(wavy grey to black). The extremely birefringent (bright coloured) muscovite grains form coarse broad crystals.  Garnets (black) commonly contain quartz inclusions.  This rock was originally a sediment that has been subject to heat and pressure that resulted in the growth of garnet and alignment of micas into bands. The rock was studied for its gold potential.