R759 Sample ID R759 • Cabinet C Lignite 3.34cm W x 4.547cm H x 2.364cm D • 18g Sample TypeRockRock QualitySedimentaryRock TypeOrganic CompositionOrganicsGrain SizeMediumGrain ShapeN/A Grain SortingWell sortedAcid ReactionYesMohs Hardness 1 It is a small rectangle, chocolate brown in color and somewaht crumbles easily Description of Mohs scale here