Home›Metamorphic Rocks›Colour›Grey or BlackBrowse ByGrey or BlackFactsGrey or BlackConnectionsSourcesComments (0)Reader Challenges (0)FactsComparisonFormation OriginWell-attestedArise from the transformation of existing rock into new rock types through metamorphism. 1Grey or BlackFilter Results5 entriesKindAllRock (5)ClassificationAllMetamorphic Rocks (5)HardnessAll7.000000 (1)UseAllBuilding and Construction (3)Industrial and Abrasive (2)Sculpture and Ornamental (1)CauseAllMetamorphism (5)Show ResultsBrowseCompareSelect all 5AmphiboliteGrey or BlackHornfelsGrey or BlackQuartziteGrey or BlackSlateGrey or BlackSoapstoneGrey or BlackConnectionsClassifiesAmphibolite, Materials Well-attested Blueschist, Materials Well-attested Eclogite, Materials Well-attested Gneiss, Materials Well-attested Greenschist, Materials Well-attested Hornfels, Materials Well-attested Marble, Materials Well-attested Migmatite, Materials Well-attested Mylonite, Materials Well-attested Quartzite, Materials Well-attested Schist, Materials Well-attested Serpentinite, Materials Well-attested Skarn, Materials Well-attested Slate, Materials Well-attested Soapstone, Materials Well-attested Sources1. Wikipedia: Metamorphic rocktier 2WikipediaMetamorphic rock, lead sectionQuote, Metamorphic rock, lead sectionMetamorphic rocks arise from the transformation of existing rock to new types of rock in a process called metamorphism.View the SourceComments (0)No comments yet. Be the first to share a thought.Sign in to join the discussion.Reader Challenges (0)No disputes yet. Spotted an error or a better source? Open the first one.Sign in to dispute this or suggest a correction.