R691 Sample ID R691 • Cabinet B Basalt 6.902cm W x 7.623cm H x 4.977cm D • 388g Sample TypeRockRock QualityIgneousRock TypeExtrusive CompositionMaficTextureVesicularColor IndexDark Clast SizeAcid ReactionMohs Hardness 6 Cubed like shape on the small-medium size rock. Has vesicles, can really tell there are vesicles on two sides opposite of each other. There is some rust red on one of the sides of the rock. Description of Mohs scale here