Fossiliferous Limestone (Coquina / Shell Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
Category
Browse sedimentary (base), then artificial specimens identified by the Rock Identifier community.
Fossiliferous Limestone (Coquina / Shell Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
Chert (Gravel)
Silicon Dioxide (SiO2)
Coquina
Biogenic Limestone (Coquina)
Chert Pebble
Microcrystalline Quartz (SiO2)
Chert (Flint)
Silicon Dioxide (SiO2)
Sandstone (Quartzose)
Arenite (primarily SiO2)
Laterite (Iron-rich bauxite or Gossan)
Ferricrete (Fe2O3·nH2O)
Conglomerate
Conglomerative Rudite (SiO2/CaCO3 matrix)
Chert (River Cobble)
Chert (Cryptocrystalline Quartz, SiO2)
Sandstone
Arenite (primarily SiO2)
Sandstone
Arenite (composed primarily of SiO2)
Limestone
CaCO3 (Mainly Calcite or Aragonite)
Quartz Pebble
Silicon Dioxide (SiO2)
Coquina or Fossiliferous Limestone
Fossiliferous Calcarenite (CaCO3)
Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement
River Cobble (Conglomerate context)
Unconsolidated Fluvial Alluvium (comprised of various lithologies like Quartzite, Granite, or Basalt)
Sandstone (with potentially metamorphic or basaltic bands)
Arenite / Lithic Wacke
Sandstone
Arenite (primarily SiO2)
Limestone
Limestone (Calcium Carbonate, CaCO3)
Breccia
Breccia
Coquina
Biogenic Limestone (mostly Calcium Carbonate, CaCO3)
Conglomerate
Clastic Sedimentary (Conglomerate)
Sandstone
Arenite (SiO2 based typically)
Dendritic Chert
Silicon Dioxide with Manganese Oxide Inclusions (SiO2 + MnO2)
Quartzite Pebbles with Quartz Veining
SiO2 (Silicon Dioxide with country rock matrix)
Gneiss
Gneiss
Conglomerate
Conglomerate (clastic sedimentary rock)
Heliotrope (Bloodstone)
Cryptocrystalline Quartz (SiO2) with inclusions of Hematite (Fe2O3)
Orbicular Jasper (Ocean Jasper variant)
Silicon Dioxide (SiO2) with iron oxide inclusions
Chert (River Pebble)
Cryptocrystalline Quartz (SiO2)
Limestone
Calcium Carbonate (CaCO3)
Chert (Iron-stained)
Chert (Cryptocrystalline Quartz, SiO2)
Chalcedony Geode / Quartz Druzy
Silicon Dioxide (SiO2)
Leopard Skin Jasper
Jasper (Silicon Dioxide with impurities), SiO2
Ironstone (with possible Hematite/Limonite coating)
Ironstone (Fe-rich sedimentary rock)
Sandstone (with potentially high Feldspar/Arkose content)
Clastic sedimentary rock (SiO2 dominated)
Sandstone
Arenite (typically SiO2 based)
Sedimentary Breccia
Breccia (Clastic Sedimentary Rock)
Biotite (Black Mica)
Biotite - K(Mg,Fe)3(AlSi3O10)(F,OH)2
Gray Limestone
Calcite-rich Sedimentary Rock (CaCO3)
Sandstone (likely Quartzose Sandstone)
Arenite (composed primarily of SiO2)
Puddingstone
Conglomerate