R652 Sample ID R652 • Cabinet B Pumice 15.263cm W x 9.131cm H x 9.475cm D • 616g Sample TypeRockRock QualityIgneousRock TypeExtrusive CompositionPyroclasticTextureVesicularColor IndexIntermediate Clast SizeAcid ReactionMohs Hardness 6 It is rectangular shaped, mostly gray of varying shades, colored with some brown lines. There are a few holes in the rock Description of Mohs scale here