R754 Sample ID R754 • Cabinet C Arkose Sandstone 15.139cm W x 19.9cm H x 14.413cm D • 9038g Sample TypeRockRock QualitySedimentaryRock TypeClastic CompositionClaysGrain SizeMediumGrain ShapeRounded Grain SortingWell sortedAcid ReactionNoMohs Hardness 3 A white line goes almost diagonally across the the rock where basalt and Arkose Sandstone are in contact with each other. Under the white line, the rock is black, while above the white line the rock is brown. Description of Mohs scale here