Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Category
Sedimentary Or Metamorphic (Low Grade)
Browse sedimentary or metamorphic (low grade) specimens identified by the Rock Identifier community.
Baltic Amber (Butterscotch or Egg Yolk Variety)
Succinite (chemical formula: C10H16O)
Organic Gemstone (not a rock or mineral)
Smoky Quartz
SiO2 (Silicon Dioxide)
mineral
Pink Sapphire
Corundum (Al2O3) with Chromium/Iron/Titanium trace impurities
mineral
Siltstone
Siltstone (fined-grained clastic sedimentary rock)
sedimentary
Garnet (almandine or pyrope variety)
Silicate mineral Group: (Fe, Mg, Mn, Ca)3(Al, Fe, Cr)2(SiO4)3
mineral
Quartzite (River Cobble)
Quartzite (SiO2)
metamorphic
Halite (Rock Salt)
Halite (NaCl)
mineral
Halite (Rock Salt)
Halite (Sodium Chloride, NaCl)
mineral
Yellow Chalcedony or River Jasper
Silicon Dioxide (SiO2)
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Banded Siltstone or Argillite
Siltstone (primarily SiO2 with Al and Fe oxides)
sedimentary
Banded Gneiss
Gneiss (typically quartz, feldspar, mica, amphibole composition)
metamorphic
Calcite
Calcite (CaCO3)
Mineral
Lapis Lazuli (Tumbled)
Lazurite-dominated contact metamorphic rock
metamorphic
Fossiliferous Shale Matrix
Clastic Sedimentary Rock with Brachiopod or Mollusk shell fragments
sedimentary
Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Ferruginous Siltstone or Mudstone
Ferruginous Siltstone / Goethitic Sandstone
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Peacock Ore (Bornite or Iridescent Chalcopyrite)
Bornite (Cu5FeS4) or Chalcopyrite (CuFeS2) with tarnish
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides (Goethite)
sedimentary
Shale (with minor calcite veining)
Clastic sedimentary rock (primarily clay minerals and quartz)
sedimentary
Tufa (Limestone)
Calcareous Tufa (CaCO3)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Banded Calcite (often sold as 'Mexican Onyx')
Calcite (Calcium Carbonate - CaCO3)
sedimentary
Chert (Jasper/Carnelian variety)
Microcrystalline Quartz (SiO2)
sedimentary
Limonite (Ironstone Concretion)
Limonite (Hydrated iron(III) oxide-hydroxide, mixtures of FeO(OH)·nH2O)
sedimentary
Chalcedony (specifically Agate or Common Opal variety)
Cryptocrystalline Silica (SiO2)
mineral
Carnelian (Red Agate/Chalcedony)
Cryptocrystalline Quartz (SiO2) with Hematite impurities
mineral
Carnelian
Carnelian (Silicon Dioxide, SiO2)
mineral
Garnet
Garnet Group (Silicate mineral); general formula X3Y2(SiO4)3
Mineral
Quartz-veined Siltstone
Siltstone with Quartz (SiO2) veins
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Emerald in Matrix
Beryl (Be3Al2Si6O18) containing Chromium/Vanadium impurities
mineral
Chalcedony (Agate/Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
mineral
Moonstone
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Pyrite with Limonite/Goethite Alteration (Pseudomorph)
Iron Sulfide (FeS2) transitioning to Hydrated Iron Oxides (FeO(OH)·nH2O)
mineral
Blue Sapphire (Synthetic or Man-made Glass Imitation)
Corundum (Al2O3) if natural; Lead-glass or Spinal if synthetic
mineral
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Ocean Jasper
Spherulitic Chalcedony (SiO2)
sedimentary