R859 No Image! Sample ID R859 • Cabinet B Basalt (Vesicular lava) 7.88cm W x 4.0cm H x 8.2cm D • 402g Sample TypeRockRock QualityIgneousRock TypeExtrusive CompositionMaficTextureVesicularColor IndexDark Clast SizeAcid ReactionMohs Hardness 7 Dark piece of basalt with several holes in it (vesicular) Description of Mohs scale here