Home›Igneous Rocks›Colour›Grey or BlackBrowse ByGrey or BlackFactsGrey or BlackConnectionsSourcesComments (0)Reader Challenges (0)FactsComparisonFormation OriginWell-attestedFormed through the cooling and solidification of magma or lava. 1Grey or BlackFilter Results8 entriesKindAllRock (8)ClassificationAllIgneous Rocks (8)HardnessAll5.500000 (1)UseAllBuilding and Construction (5)Industrial and Abrasive (2)Sculpture and Ornamental (2)RarityAllAbundant (2)CauseAllVolcanism (5)Show ResultsBrowseCompareSelect all 8AndesiteGrey or BlackBasaltGrey or BlackDioriteGrey or BlackGabbroGrey or BlackGraniteGrey or BlackObsidianGrey or BlackRhyoliteGrey or BlackScoriaGrey or BlackConnectionsClassifiesAndesite, Materials Well-attested Anorthosite, Materials Well-attested Basalt, Materials Well-attested Dacite, Materials Well-attested Diabase, Materials Well-attested Diorite, Materials Well-attested Dunite, Materials Well-attested Gabbro, Materials Well-attested Granite, Materials Well-attested Kimberlite, Materials Well-attested Komatiite, Materials Well-attested Monzonite, Materials Well-attested Norite, Materials Well-attested Obsidian, Materials Well-attested Pegmatite, Materials Well-attested Peridotite, Materials Well-attested Porphyry, Materials Well-attested Pumice, Materials Well-attested Rhyolite, Materials Well-attested Scoria, Materials Well-attested Syenite, Materials Well-attested Trachyte, Materials Well-attested Tuff, Materials Well-attested Sources1. Wikipedia: Igneous rocktier 2WikipediaIgneous rock, lead sectionQuote, Igneous rock, lead sectionIgneous rocks are formed through the cooling and solidification of magma or lava.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.