Rounded quartz-rich river pebble
Likely quartz-bearing rock; exact lithology cannot be determined from the photograph
igneous
Category
Sedimentary Rock Or Mineral (Depending On Origin And Purity)
Browse sedimentary rock or mineral (depending on origin and purity) specimens identified by the Rock Identifier community.
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Blue-stone ring, likely set with blue glass or a dark-blue gemstone
The stone cannot be identified reliably from the image; possible sapphire (corundum, Al₂O₃), lapis lazuli, or glass
gemstone
Opal cabochon
Opal, hydrated amorphous silica (SiO₂·nH₂O), likely common or Ethiopian precious opal
gemstone
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Amethyst cluster
Amethyst, purple quartz (SiO₂)
mineral
White Quartz (Milky Quartz Mushroom)
Silicon Dioxide (SiO2)
mineral
Concretion
Sedimentary Concretion (Ironstone / Calcite Concretion)
sedimentary
Banded Iron Formation (Fragment)
Banded Iron Formation (BIF)
sedimentary
Sandstone
Arenite (primarily composed of SiO2)
sedimentary
Turquoise
Turquoise (Hydrated phosphate of copper and aluminium), CuAl6(PO4)4(OH)8·4H2O
mineral
Sandstone (Glacial Cobble)
Arenite / Sedimentary Rock (primarily SiO2)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Arenite
sedimentary
Quartz (likely Milky Quartz or Chalcedony)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Native Copper with Cuprite and Quartz
Copper (Cu), Cuprite (Cu2O), Quartz (SiO2)
mineral
Gold Nugget
Native Gold (Au)
mineral
Iridium sand or Osmium-Iridium nugget
Iridosmine / Osmiridium (Platinoid grouping)
mineral
Sandstone
Clastic sedimentary rock
sedimentary
Mixed Rock Collection (Pebbles and Stones)
Various geological specimens
igneous, sedimentary, and metamorphic
Emerald
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Sandstone
Sandstone (Siliciclastic Sedimentary Rock)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Banded Sedimentary Rock
Sedimentary rock with mineral veins/banding
sedimentary
Gold Nugget
Native Gold (Au)
mineral
Sandstone (likely Iron-rich or Arkosic)
Arenite (SiO2 with FeO(OH) or Fe2O3 staining)
sedimentary
Desert Varnish (on Sandstone)
Rock Varnish (composed of Manganese oxides, Iron oxides, and Clay minerals)
sedimentary
Colorless faceted gemstone, likely glass or cubic zirconia
Uncertain; possible cubic zirconia (zirconium dioxide, ZrO₂) or synthetic glass
gemstone
Sandstone
Arenite (primarily Quartz Sandstone)
sedimentary
Ammonite Fossil
Ammonoidea subclass (calcium carbonate / silica replacement)
fossil
Raw gold nugget or gold-bearing quartz
Native gold (Au), possibly with quartz (SiO₂) and iron-oxide staining
mineral
Worn River Pebble with Fossil Indentation
Sedimentary Rock with Fossil Infill
sedimentary
Quartz Breccia with Iron Staining
Tectonic or Sedimentary Breccia (SiO2 with Fe2O3)
sedimentary
Sedimentary River Rock
Siliciclastic Sedimentary Rock (Quartzite or Sandstone pebble)
sedimentary
Quartz-rich gneiss
Foliated quartz–feldspar–mica gneiss, possibly migmatitic
metamorphic
Quartz (Rock Crystal) with minor impurities
Quartz (SiO2)
Mineral
Ironstone / Weathered Hematite
Iron oxide-rich sedimentary rock with Goethite/Hematite
sedimentary
River Pebble
Polished Rock Fragment
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Quartz-veined Sandstone
Quartzite-veined Arenite / SiO2 and quartz sand
sedimentary
Diamond bracelet (gold-set)
Diamond, crystalline carbon (C); gold alloy setting
gemstone
Sandstone (Quartzose Sandstone)
Arenite (SiO2 principal component)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic