Rock Identifier

Category

Limestone

Browse limestone specimens identified by the Rock Identifier community.

Learn about Limestone in the encyclopedia

Limestone

Lithographic Limestone

Oolitic Limestone

Oolitic Limestone

Fossiliferous Limestone

Fossiliferous Limestone

Chalky Limestone

Crinoidal Limestone

Crinoidal Limestone

Shelly Limestone

Shelly Limestone

Micrite

Calcirudite

Coral Rock

Coquina

Chalk

Brachiopod Fossil (Rhynchonellida (Order)) — sedimentary

Brachiopod Fossil

Rhynchonellida (Order)

Quartz and Limestone Grouping (Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3)) — mineral

Quartz and Limestone Grouping

Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3)

Fossiliferous Limestone (Biogenic Sedimentary Rock (primarily CaCO3 with fossil fragments)) — sedimentary

Fossiliferous Limestone

Biogenic Sedimentary Rock (primarily CaCO3 with fossil fragments)

Fossilized Gastropod in Limestone (Gastropoda (Class) in Fossiliferous Limestone) — sedimentary

Fossilized Gastropod in Limestone

Gastropoda (Class) in Fossiliferous Limestone

Chert (specifically Tan/Brown Chert) (Chert (SiO2)) — sedimentary

Chert (specifically Tan/Brown Chert)

Chert (SiO2)

Chert (Flint) (Microcrystalline quartz (SiO2)) — sedimentary

Chert (Flint)

Microcrystalline quartz (SiO2)

Weathered chert or silicified limestone nodule (Microcrystalline quartz (SiO₂), possibly replacing limestone; exact identification requires testing) — sedimentary

Weathered chert or silicified limestone nodule

Microcrystalline quartz (SiO₂), possibly replacing limestone; exact identification requires testing

Chert Nodule in Limestone (Silicon Dioxide (SiO2) in Calcium Carbonate (CaCO3)) — sedimentary

Chert Nodule in Limestone

Silicon Dioxide (SiO2) in Calcium Carbonate (CaCO3)

Chert Nodule in Limestone (Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)) — sedimentary

Chert Nodule in Limestone

Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)

Quartz on Limestone (Silicon Dioxide (SiO2) on Calcium Carbonate (CaCO3)) — Mineral on Sedimentary

Quartz on Limestone

Silicon Dioxide (SiO2) on Calcium Carbonate (CaCO3)

Mineral on Sedimentary

Chert (Nodule) (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Chert (Nodule)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Limestone (probable fossiliferous limestone) (Calcite-rich carbonate rock; predominantly CaCO₃ (calcite)) — sedimentary

Limestone (probable fossiliferous limestone)

Calcite-rich carbonate rock; predominantly CaCO₃ (calcite)

Coquina Limestone (Fossiliferous Limestone) (Calcareous bioclastic sedimentary rock (CaCO3)) — sedimentary

Coquina Limestone (Fossiliferous Limestone)

Calcareous bioclastic sedimentary rock (CaCO3)

Limestone (specifically Fossiliferous Limestone) (Calcium Carbonate (CaCO3)) — sedimentary

Limestone (specifically Fossiliferous Limestone)

Calcium Carbonate (CaCO3)

Limestone (specifically Chalky Limestone) (Calcium Carbonate (CaCO3 / Calcite)) — sedimentary

Limestone (specifically Chalky Limestone)

Calcium Carbonate (CaCO3 / Calcite)

Fossiliferous Limestone (Crinoidal Limestone) (Calcium Carbonate with Crinoid Stem Fossils (CaCO3)) — sedimentary

Fossiliferous Limestone (Crinoidal Limestone)

Calcium Carbonate with Crinoid Stem Fossils (CaCO3)

Fossiliferous Limestone (Chert/Clay mixed) (Calcium Carbonate (CaCO3) / Silicon Dioxide (SiO2)) — sedimentary

Fossiliferous Limestone (Chert/Clay mixed)

Calcium Carbonate (CaCO3) / Silicon Dioxide (SiO2)

Blue Spinel on Marble with Phlogopite (MgAl2O4 (Spinel) in CaCO3 (Calcite/Marble) matrix) — metamorphic

Blue Spinel on Marble with Phlogopite

MgAl2O4 (Spinel) in CaCO3 (Calcite/Marble) matrix

Polished fossil coral (likely fossilized honeycomb or tabulate coral) (Fossilized tabulate coral; commonly Favosites or related genera, preserved mainly as calcite (CaCO₃)) — fossil

Polished fossil coral (likely fossilized honeycomb or tabulate coral)

Fossilized tabulate coral; commonly Favosites or related genera, preserved mainly as calcite (CaCO₃)

Limestone with Fossil Fish Fragment (Calcite (CaCO3) containing a fossil teleost) — sedimentary

Limestone with Fossil Fish Fragment

Calcite (CaCO3) containing a fossil teleost

Druzy Quartz on Limestone (Silicon Dioxide (SiO2)) — mineral

Druzy Quartz on Limestone

Silicon Dioxide (SiO2)

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Weathered limestone (Calcite-rich carbonate rock (mostly CaCO₃), possibly fossiliferous limestone) — sedimentary

Weathered limestone

Calcite-rich carbonate rock (mostly CaCO₃), possibly fossiliferous limestone

Fossiliferous Limestone (Coquina / Shell Limestone) (Biogenic Limestone (Calcium Carbonate, CaCO3)) — sedimentary

Fossiliferous Limestone (Coquina / Shell Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Fossilized Echinoid (Sea Urchin) or Brachiopod (Echinoidea / Invertebrate Fossil) — fossil

Fossilized Echinoid (Sea Urchin) or Brachiopod

Echinoidea / Invertebrate Fossil

Starfish Fossil (Asteroidea fossil) — fossil

Starfish Fossil

Asteroidea fossil

Fossilized Gastropod in Limestone (Gastropoda (Class) in Calcium Carbonate (CaCO3)) — sedimentary

Fossilized Gastropod in Limestone

Gastropoda (Class) in Calcium Carbonate (CaCO3)

Weathered blue-gray calcite/aragonite fragment (Calcium carbonate (CaCO₃), probably calcite; possibly shell-derived aragonite) — mineral

Weathered blue-gray calcite/aragonite fragment

Calcium carbonate (CaCO₃), probably calcite; possibly shell-derived aragonite

Sandstone / Limestone (Sedimentary Rock (Quartz Sandstone or Calcareous Grainstone)) — sedimentary

Sandstone / Limestone

Sedimentary Rock (Quartz Sandstone or Calcareous Grainstone)

Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Chert

Microcrystalline Quartz (SiO2)

Travertine (Travertine (CaCO3)) — sedimentary

Travertine

Travertine (CaCO3)

Chert (with Chalky Cortex) (Silicon Dioxide (SiO2)) — sedimentary

Chert (with Chalky Cortex)

Silicon Dioxide (SiO2)

Mosasaur Tooth Fossil (Mosasaurus sp.) — fossil

Mosasaur Tooth Fossil

Mosasaurus sp.

Chert Nodules in Limestone (Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)) — sedimentary

Chert Nodules in Limestone

Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)

Flint / Chert (Silicon dioxide (Microcrystalline Quartz, SiO2)) — sedimentary

Flint / Chert

Silicon dioxide (Microcrystalline Quartz, SiO2)

Fossiliferous Limestone (Calcium Carbonate (CaCO3) with fossil inclusions) — sedimentary

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with fossil inclusions

Polished brown flint/chert (likely) (Microcrystalline quartz, SiO₂ (chalcedonic flint/chert)) — sedimentary

Polished brown flint/chert (likely)

Microcrystalline quartz, SiO₂ (chalcedonic flint/chert)

Chert with Limestone (Silicon Dioxide (SiO2) in Calcium Carbonate (CaCO3) Matrix) — sedimentary

Chert with Limestone

Silicon Dioxide (SiO2) in Calcium Carbonate (CaCO3) Matrix

Chert (within Limestone) (Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)) — sedimentary

Chert (within Limestone)

Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)

Geode (Unopened) (Quartz Geode (SiO2-rich chalcedony/quartz nodule)) — sedimentary

Geode (Unopened)

Quartz Geode (SiO2-rich chalcedony/quartz nodule)

Seashell Fragment (Calcium carbonate (CaCO3) - primarily Aragonite or Calcite) — fossil

Seashell Fragment

Calcium carbonate (CaCO3) - primarily Aragonite or Calcite

Chalk (Calcium Carbonate (CaCO3)) — sedimentary

Chalk

Calcium Carbonate (CaCO3)