Home›Rocks and Minerals›Minerals›Where Found›United StatesBrowse ByUnited StatesUnited StatesComments (0)Reader Challenges (0)United StatesFilter Results4 entriesStrunz ClassAllOxides and Hydroxides (1)Phosphates, Arsenates and Vanadates (1)Silicates (2)Crystal SystemAllHexagonal Crystal System (1)Orthorhombic Crystal System (1)Triclinic Crystal System (1)HardnessAll3.75 to 5.5 Mohs (1)5.75 to 6.25 Mohs (1)7.5 to 8.5 Mohs (2)LustreAllEarthy (1)Pearly (1)Resinous (1)Vitreous (3)Waxy or Greasy (3)ColourAllBlue or Purple (3)Brown (3)Colourless or White (2)Green (4)Grey or Black (3)Orange or Yellow (3)Red or Pink (3)RarityAllRare (1)Uncommon (1)UseAllGemstone (4)Formed By (Process)AllBiomineralization (1)Fractional Crystallization (2)Hydrothermal Mineral Deposition (3)Metasomatism (2)Supergene Processes (1)Show ResultsBrowseCompareSelect all 4BerylUnited StatesChrysoberylUnited StatesOpalUnited StatesTurquoiseUnited StatesComments (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.