R674 Sample ID R674 • Cabinet B Rhyolite 4.724cm W x 11.189cm H x 5.634cm D • 242g Sample TypeRockRock QualityIgneousRock TypeExtrusive CompositionFelsicTexturePhaneriticColor IndexLight Clast SizeAcid ReactionMohs Hardness 6 Somewhat of a triangle shape that is leaning towards one side. Somewhat on the small-medium side in terms of size. Has red and blue/purple crystals in it. Description of Mohs scale here