Limestone
Calcium Carbonate (CaCO3)
Category
Browse sedimentary (man made) specimens identified by the Rock Identifier community.
Limestone
Calcium Carbonate (CaCO3)
Sandstone (Ferruginous)
Arenite with Iron-oxide inclusions (SiO2 primarily)
Sandstone
Arenite (SiO2 based clastic rock)
Chert / Flint
Silicon dioxide (SiO2)
Stainless Steel Spoon
Iron-Chromium Alloy (Fe + Cr + Ni)
Tumbled sodalite with white calcite veining
Sodalite, Na8(Al6Si6O24)Cl2, commonly intergrown with calcite, CaCO3
Limestone
Sedimentary rock composed primarily of Calcium Carbonate (CaCO3)
Limestone (or Calcite Nodules)
Calcium Carbonate (CaCO3)
Limestone
Calcium Carbonate (CaCO3)
Sandstone
Arenite (predominantly SiO2 with iron oxides)
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
Sandstone with Quartz Veining
Arenite with SiO2 veins
Sandstone
Arenite (primarily SiO2)
Sandstone (Ferruginous)
Arenite with Iron Oxides
Limestone
Calcareous sedimentary rock (CaCO3)
Limestone (River Stone)
Calcium Carbonate (CaCO3)
Sandstone (with minor weathering/pitting)
Clastic Sedimentary Rock (composed mostly of SiO2)
Limestone
Calcium Carbonate (CaCO3)
Sandstone (Flagstone)
Arenite (composed primarily of SiO2)
Sandstone with Calcite Vein
Clastic sedimentary rock (primarily SiO2) with Calcium Carbonate (CaCO3) infilling
Granite fragment
Granite
Likely hematite-rich ironstone or metallic mineral fragment
Hematite (Fe₂O₃), possibly with magnetite (Fe₃O₄) or metallic iron
Weathered mafic rock, likely basalt
Basalt; primarily plagioclase feldspar, clinopyroxene, and commonly olivine or magnetite
Iron-stained chert or jasper pebble
Microcrystalline quartz (SiO₂), likely hematite/goethite-bearing
Limestone
Calcium Carbonate (CaCO3)
Limestone
Sedimentary Calcium Carbonate (CaCO3)
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Bioclasts
Ferruginous Sandstone with Quartz Inclusions
Clastic Sedimentary Rock (Iron-rich Sandstone)
Sandstone
Arenite (Sedimentary rock composed of sand-sized grains)
Fossiliferous Limestone (Bivalve Fossil)
Calcium Carbonate (CaCO3) with Bivalvia fossil
Limestone Pebble
Calcium Carbonate (CaCO3)
Sandstone Concretion
Clastic Sedimentary Rock - Quartz Arenite / Sandstone
Granite (likely biotite granite)
Coarse-grained granitic rock; chiefly quartz, potassium feldspar, plagioclase, and biotite/hornblende
Rose Quartz Carving
Quartum roseum (Variety of Quartz, SiO2)
Rose Quartz (likely carved)
Rose Quartz (SiO2)
Fossiliferous Limestone
Calcium Carbonate (CaCO3) - Limestone
Limestone
Sedimentary Calcium Carbonate (CaCO3)
Painted Sandstone
Sandstone (clastic sedimentary rock) with acrylic/artistic coating
Banded Sandstone
Arenite with iron oxide banding
Red Sandstone (Iron-stained)
Clastic sedimentary rock (primarily Quartz with Iron Oxides)
Sandstone
Arenite (SiO2 principal component)
Limestone
Calcium Carbonate (CaCO3)