R702 Sample ID R702 • Cabinet C Quartzite 8.975cm W x 11.811cm H x 5.752cm D • 958g Sample TypeRockRock QualitySedimentaryRock TypeClastic CompositionMineral grainsGrain SizeMediumGrain ShapeAngular Grain SortingWell sortedAcid ReactionNoMohs Hardness 8 It is a medium sizes rectangle that is practically entirely grey. You can see grains and some quartz grains in the rock. There are lots of cleavages in the rock on three out of 4 of the sides. One side is flat though it looks like it was cut at an angle Description of Mohs scale here