Limestone
Calcium Carbonate (CaCO3)
Category
Browse man made composite (lithified equivalent of sedimentary) specimens identified by the Rock Identifier community.
Limestone
Calcium Carbonate (CaCO3)
Limestone (specifically Iron-stained or Argillaceous Limestone)
Calcium Carbonate (CaCO3) with Iron Oxide (Fe2O3) impurities
Sandstone (Quartzose)
Arenite (primarily SiO2)
Limestone
Calcium Carbonate (CaCO3)
Sandstone
Sandstone (clastic sedimentary rock, predominantly SiO2)
Sandstone (Calcareous Sandstone)
Calcareous Sandstone (primarily SiO2 with CaCO3 cement)
Sandstone
Clastic Sedimentary Rock (primarily Quartz, SiO2)
Sandstone (River Pebble)
Arenite
Vesicular Basalt with Quartz/Chalcedony
Vesicular Basalt (primarily Plagioclase, Pyroxene, and Olivine with SiO2 infill)
Dalmatian Jasper (Dalmatian Stone)
Peralkaline rhyolite
Shiva Lingam
Cryptocrystalline Quartz (Jasproid/Jasper)
Granite
Granite (Phaneritic Acidic Igneous Rock)
Granite
Granite (Felsic Plutonic Rock)
Basalt
Basalt
Vesicular Basalt
Vesicular Basalt (rich in silicate minerals mostly Plagioclase and Pyroxene)
Caliche (also known as hardpan, calcrete, kankar)
Primarily composed of calcium carbonate (CaCO₃), often mixed with other minerals like quartz, clay minerals, and iron oxides.
Sandstone
Clastic sedimentary rock (primarily SiO2)
Ferruginous Sandstone
Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)
Sandstone
Arenite (primarily Quartz, SiO2)
Sandstone
Arenite
Ferruginous Sandstone
Clastic Sedimentary Rock (Iron-rich)
Limestone
Calcium Carbonate (CaCO3)
Kambaba Jasper (Crocodile Jasper)
Stromatolite (Fossilized Algae)
Limestone
Calcium Carbonate (CaCO3)
Sandstone
Arenite (SiO2 based with various cements)
Limestone
Calcium Carbonate (CaCO3)
Limestone
Calcium Carbonate (CaCO3)
Weathered Sandstone with Algae Growth
Arenite
Limestone (Buff/Tan)
Calcium Carbonate (CaCO3)
Limestone
Calcium Carbonate (CaCO3)
Sandstone
Arenite (primarily SiO2)
Granite
Felsic Intrusive Igneous Rock
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
Halite (Rock Salt)
Halite; NaCl (Sodium Chloride)
Granite
Granite (Felsic Plutonic Rock)
Vesicular Basalt
Basalt
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
Diorite (possibly fine-grained variety or a related intermediate intrusive rock like a felsic gabbro or a dark granodiorite)
Diorite (Igneous rock, intrusive, intermediate composition)
Red Sandstone
Clastic Terrigenous Sedimentary Rock (composed mostly of SiO2 with Fe2O3)
Rose Quartz Carving
Quartum roseum (Variety of Quartz, SiO2)
Quartz on Sandstone
Silicon Dioxide (SiO2) in Lithic Sandstone
Sandstone (likely Graywacke or Arkose variant)
Clastic Sedimentary Rock (SiO2 with assorted lithic fragments)