R703 Sample ID R703 • Cabinet B Basalt 4.488cm W x 5.54cm H x 3.841cm D • 208g Sample TypeRockRock QualityIgneousRock TypeExtrusive CompositionMaficTextureVesicularColor IndexDark Clast SizeAcid ReactionMohs Hardness 6 Small rectangular rock with some vesicles, that has xenolith of olivine crystals. The olivine crystals are green, yellow, dark green and black colored. Description of Mohs scale here