Low to medium grade metamorphic rock. Specimen of quartzite and phyllite that has been eroded into unusual shape. Middle layer is finer grained and has more clay minerals while the outer layers are coarser grained with more quartz minerals.
Low to medium grade metamorphic rock. Specimen of quartzite and phyllite that has been eroded into unusual shape. Middle layer is finer grained and has more clay minerals while the outer layers are coarser grained with more quartz minerals.