River Cobble (Quartzite-rich Sandstone)
Clastic Sedimentary Rock (Litharenite/Quartzite transition)
sedimentary
Category
Sedimentary (Base), Then Artificial
Browse sedimentary (base), then artificial specimens identified by the Rock Identifier community.
Chert (Arrowhead Preform)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Dendritic Jasper
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
sedimentary
Dendritic Limestone
Calcite with Manganese Oxide (Manganese Dendrites)
sedimentary
Sandstone
Arenite (primarily Quartz, SiO2)
sedimentary
Ocherous Sandstone (Ferruginous Sandstone)
Ferruginous Arenite (SiO2 with Fe2O3)
sedimentary
Pebble (likely Limestone or Siltstone)
Lithic fragment (calcareous or siliciclastic)
sedimentary
Precious Opal
Hydrated amorphous silica (SiO2·nH2O)
mineral
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
mineral
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Chert (River Cobble)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Gray Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (with inclusions)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock type)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Geode with Iron-Stained Quartz/Calcite
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) in Sedimentary Matrix
sedimentary
Chert (Field Stone/Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (also known as Flint or Common Chalcedony)
Cryptocrystalline Silica (SiO2)
sedimentary
Coquina
Bioclastic Limestone (composed of CaCO3)
sedimentary
Sandstone (Muddy/Silty Variety)
Arenite with high silt/clay content (clastic sedimentary rock)
sedimentary
Coquina
Bioclastic Limestone (Coquina)
sedimentary
Ferruginous Sandstone (Grit)
Clastic Sedimentary (Ironstone-rich Sandstone)
sedimentary
Fossiliferous Limestone (Coquina)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Ferruginous Sandstone (Ironstone)
Ferruginous Sandstone / Limonite-cemented Quartz Sandstone
sedimentary
Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
sedimentary
Fossiliferous Limestone (Coquina / Shell Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Coquina / Fossiliferous Limestone
Calcareous bioclastic sedimentary rock (CaCO3)
sedimentary
Quartz Veined Rock (Likely Graywacke or Quartzite)
Silicon Dioxide (SiO2) veins in Metasedimentary matrix
metamorphic
River Pebble (Gneiss or Quartzite mixture)
Metamorphic rock (Commonly Gneissic)
metamorphic
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Fossil Coral
Cnidaria Anthozoa (Fossilized)
sedimentary
River Cobbles (Basalt, Quartzite, and Sandstone mix)
Fluvial detritus (primarily SiO2, Plagioclase, and Pyroxene mix)
Mixed: Igneous and Sedimentary
Pyrite
Iron Pyrite (FeS2)
Mineral
Sandstone (likely Ferruginous)
Sandstone (SiO2 with iron oxides)
sedimentary
Sandstone (Greywacke/Lithic Sandstone)
Arenite / Lithic Sandstone
sedimentary
Sandstone (likely Quartzose)
Clastic sedimentary rock (SiO2 primary)
sedimentary
Mica Schist
Mica Schist (Composition: Muscovite, Biotite, Quartz, Feldspar)
metamorphic
Anthracite Coal
Anthracite (Carbon-based sedimentary-derived metamorphic rock)
metamorphic
Chert (and Limestone)
Silicon Dioxide (SiO2)
sedimentary
Muscovite Schist
Mica Schist (primarily KAl2(AlSi3O10)(OH)2)
metamorphic