Home›Rocks and Minerals›Minerals›Colour›Grey or BlackBrowse ByGrey or BlackGrey or BlackComments (0)Reader Challenges (0)Grey or BlackFilter Results31 entriesStrunz ClassAllCarbonates and Nitrates (1)Oxides and Hydroxides (3)Silicates (12)Crystal SystemAllCubic Crystal System (9)Hexagonal Crystal System (2)Monoclinic Crystal System (4)Orthorhombic Crystal System (5)Triclinic Crystal System (1)Trigonal Crystal System (6)HardnessAll3.75 to 5.5 Mohs (1)5.75 to 6.25 Mohs (3)6.5 to 6.75 Mohs (3)7 to 7.25 Mohs (4)7.5 to 8.5 Mohs (4)LustreAllAdamantine (1)Earthy (5)Metallic (1)Pearly (3)Resinous (1)Vitreous (14)Waxy or Greasy (4)Where FoundAllAfghanistan (1)Australia (4)Brazil (4)Canada (2)China (1)Colombia (1)Greece (1)Guatemala (1)Honduras (1)India (3)Indonesia (1)Madagascar (3)Mexico (1)Myanmar (3)Namibia (1)New Zealand (1)Nigeria (2)Pakistan (1)Peru (1)Poland (1)Russia (4)Sri Lanka (3)Tanzania (2)United States (3)Vietnam (1)Zambia (2)Zimbabwe (4)RarityAllAbundant (1)Common (1)Rare (2)Uncommon (1)UseAllCeramic and Glass Manufacture (1)Gemstone (13)Ore or Metal Extraction (1)Sculpture and Ornamental (1)Formed By (Process)AllBiomineralization (4)Diagenesis (3)Fractional Crystallization (14)Hydrothermal Circulation (3)Hydrothermal Mineral Deposition (11)Magmatism (8)Metamorphism (14)Metasomatism (4)Sedimentation (5)Serpentinization (2)Subduction (1)Supergene Processes (1)Ultra-High-Pressure Metamorphism (1)Volcanism (4)Weathering (1)Show ResultsBrowseCompareSelect all 31ApatiteGrey or BlackAragoniteGrey or BlackBerylGrey or BlackCalciteGrey or BlackChalcedonyGrey or BlackChrysoberylGrey or BlackCordieriteGrey or BlackCorundumGrey or BlackDiamondGrey or BlackElbaiteGrey or BlackFeldsparGrey or BlackFluoriteGrey or BlackGarnetGrey or BlackGrossularGrey or BlackGypsumGrey or BlackHaliteGrey or BlackHematiteGrey or BlackJadeiteGrey or BlackKyaniteGrey or BlackMagnetiteGrey or BlackMicaGrey or BlackOlivineGrey or BlackOpalGrey or BlackOrthoclaseGrey or BlackPyriteGrey or BlackQuartzGrey or BlackSchorlGrey or BlackSpessartineGrey or BlackSpinelGrey or BlackTalcGrey or BlackTopazGrey or BlackComments (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.