R749 Sample ID R749 • Cabinet C Chert 6.055cm W x 9.915cm H x 0.388cm D • 42g Sample TypeRockRock QualitySedimentaryRock TypeChemical CompositionSilicaGrain SizeFineGrain ShapeN/A Grain SortingWell sortedAcid ReactionNoMohs Hardness 7 It is a thin slice cut from a rock. It is a light colored rock, with streaks of red/orange and a bit of brown. Description of Mohs scale here