Limonite (Yellow Ochre)
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
mineral
Category
Mineral (Processed Alloy)
Browse mineral (processed alloy) specimens identified by the Rock Identifier community.
Pink Tourmaline in Quartz Matrix
Elbaite (Na(Li,Al)3Al6(BO3)3Si6O18(OH)4) with Quartz (SiO2)
mineral
Ferruginous Quartz
Quartz (Silicon Dioxide, SiO2) with iron oxide inclusions
mineral
Green Quartz (Aventurine or Prase)
Silicon Dioxide (SiO2) with inclusions
mineral
Magnetite (in matrix)
Magnetite (Fe3O4)
mineral
Quartz Vein Rock
Silicon dioxide (SiO2) within a host rock matrix
mineral
Cubic Zirconia
Zirconium dioxide (ZrO2)
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone River Cobble
Arenite (predominantly SiO2)
sedimentary
Fossil Shark Tooth
Carcharodon or Carcharias fossil (Vertebrate Fossil)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Man-made Synthetic Material (Costume Faux Fur)
Synthetic Polymer (Polyester/Acrylic)
not a rock
Lepidolite (Tumbled)
K(Li,Al)3(Al,Si,4O10)(F,OH)2
mineral
Iron Ore (Magnetite-Hematite)
Magnetite (Fe3O4) and Hematite (Fe2O3)
mineral
Dyed Agate
Silicon Dioxide (SiO2) - variety Chalcedony
mineral
Mixed Gemstone Collection
SiO2 (Quartz varieties) and Biogenic CaCO3 (Nacre)
mineral
Dyed Agate Geode
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Generic Rock Fragment
Rock Fragment
sedimentary
Fossilized Tooth
Vertebrate Fossilized Tooth (Mineralized Biogenic Material)
fossil
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Polished Hematite Tower
Hematite (Fe2O3)
mineral
Sandstone
Arenite (principally SiO2)
sedimentary
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Black Tourmaline
Schorl (Sodium Iron Aluminum Borosilicate Hydroxide), NaFe3Al6(BO3)3Si6O18(OH)4
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Orange Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Tiger's Eye (dark/grey variant)
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Chert (Jasper/Agate variety)
Silicon Dioxide (SiO2)
sedimentary
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Rhodonite (in matrix)
Rhodonite (Mn,Fe,Mg,Ca)SiO3
Mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Tiger's Eye
Silicon Dioxide (SiO2)
Mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Garnet Schist
Almandine-bearing Mica Schist
metamorphic
Shark Tooth Fossil
Chondrichthyes (class) fossilized tooth
fossil
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Chert (Arrowhead Fragment)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement (primarily SiO2 with Fe2O3/FeOOH)
sedimentary
Aura Quartz (Coated Quartz)
Silicon Dioxide (SiO2) coated with vaporized metals
mineral
Pink Granite
Granite (High K-Feldspar variety)
igneous