R714 Sample ID R714 • Cabinet B Volcanic Breccia 9.534cm W x 10.242cm H x 3.438cm D • 636g Sample TypeRockRock QualitySedimentaryRock TypeClastic CompositionRock fragmentsGrain SizeCoarseGrain ShapeAngular Grain SortingPoorly sortedAcid ReactionNoMohs Hardness 9 It is somewhat shaped like a square. You can see different rock fragments of different sizes and colors. The cementing between the rock fragments is grey. Description of Mohs scale here