Flint/Chert Nodule in Limestone
Sedimentary rock containing microcrystalline quartz (SiO2) within a calcium carbonate (CaCO3) matrix
sedimentary
Category
Limestone
Browse limestone specimens identified by the Rock Identifier community.
Weathered chert or siliceous limestone
Microcrystalline quartz (SiO₂), possibly with carbonate minerals
sedimentary
Fossiliferous Limestone
Biogenic Sedimentary Rock
sedimentary
Chert Nodule in Limestone
Chert (Microcrystalline Quartz, SiO2) and Limestone (Calcium Carbonate, CaCO3)
sedimentary
Limestone Pebble
Calcite-rich Sedimentary Rock (CaCO3)
sedimentary
Limestone
Limestone (Calcium Carbonate, CaCO3)
sedimentary
Limestone
Calcareous Sedimentary Rock (CaCO3)
sedimentary
Druzy Quartz on Limestone
Silicon Dioxide (SiO2) on Calcium Carbonate (CaCO3)
sedimentary
Chert (Flint) with Limestone Matrix
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Fossiliferous Limestone
Calcite (CaCO3) with Bioclastic inclusions
sedimentary
Chert or siliceous limestone fragments
Microcrystalline quartz (chert) and/or calcarenite; exact identification is uncertain from the photograph
sedimentary
Light-colored limestone (likely chalky or calcitic limestone)
Calcite-rich limestone; primarily calcium carbonate, CaCO₃
sedimentary
Limestone Pebble
Limestone (Calcium Carbonate, CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Crinoid Stem Fossil
Crinoidea (Class)
fossil
Pyrite on Limestone
Iron Disulfide (FeS2) in Calcium Carbonate (CaCO3) matrix
sedimentary (matrix) / mineral (inclusion)
Quartz / Limestone Gravel
SiO2 (Silicon Dioxide) and CaCO3 (Calcium Carbonate)
igneous and sedimentary mixture
Limestone
Limestone (CaCO3)
sedimentary
Limestone
Sedimentary rock composed mainly of calcium carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert Nodules in Limestone
Microcrystalline Quartz (SiO2) in Carbonate Matrix
sedimentary
Weathered limestone
Limestone; predominantly calcite (CaCO₃)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Sedimentary rock composed of Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert Nodules in Limestone
Cryptocrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Limestone with Bitumen/Chert
Calcite (CaCO3) containing organic hydrocarbons
sedimentary
Crinoidean Fossil (Stem Fragment)
Phylum Echinodermata, Class Crinoidea
fossil
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Lapis Lazuli
Lazurite with Calcite and Pyrite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2
metamorphic
Barite
Barium Sulfate (BaSO4)
mineral
Chert (and Limestone)
Silicon Dioxide (SiO2) in Calcium Carbonate (CaCO3)
sedimentary
Likely chert or weathered limestone fragment
Microcrystalline quartz (SiO₂) or calcitic limestone (CaCO₃); identification is limited by the blurred image
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Gray Limestone
Calcite-rich Sedimentary Rock (CaCO3)
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Bioclasts
sedimentary
Marine invertebrate fossils (Brachiopods and Gastropods)
Phylum Brachiopoda and Class Gastropoda
fossil