R861 No Image! Sample ID R861 • Cabinet C Banded Ironstone 9.9cm W x 4.5cm H x 5.4cm D • 448g Sample TypeRockRock QualitySedimentaryRock TypeChemical CompositionSilicaGrain SizeVery fineGrain ShapeSubrounded Grain SortingWell sortedAcid ReactionNoMohs Hardness 5 3 pieces of banded ironstone with visible layers that alternate between red and gray. Description of Mohs scale here