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

Crinoid stem fossil (Crinoidea) — fossil

Crinoid stem fossil

Crinoidea

Quartz-rich pebble, possibly chert or silicified limestone (Microcrystalline quartz (SiO₂), possibly chalcedony; exact identification is uncertain from the photograph) — sedimentary

Quartz-rich pebble, possibly chert or silicified limestone

Microcrystalline quartz (SiO₂), possibly chalcedony; exact identification is uncertain from the photograph

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

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert (or Flint) (Chert (cryptocrystalline quartz), SiO2) — Sedimentary

Chert (or Flint)

Chert (cryptocrystalline quartz), SiO2

Chert (Flint) (Silicon dioxide (SiO2)) — sedimentary

Chert (Flint)

Silicon dioxide (SiO2)

Lapis Lazuli (in Matrix) (Na8[Al6Si6O24]S2 (Lazurite as the primary component)) — metamorphic

Lapis Lazuli (in Matrix)

Na8[Al6Si6O24]S2 (Lazurite as the primary component)

Chert (Nodule) (Microcrystalline Silica (SiO2)) — sedimentary

Chert (Nodule)

Microcrystalline Silica (SiO2)

Fossiliferous limestone (Bioclastic limestone, predominantly calcite (CaCO₃)) — sedimentary

Fossiliferous limestone

Bioclastic limestone, predominantly calcite (CaCO₃)

Oolitic Limestone (Oolitic Limestone (Calcium Carbonate, CaCO3)) — sedimentary

Oolitic Limestone

Oolitic Limestone (Calcium Carbonate, CaCO3)

Light-colored weathered stone, likely limestone (Limestone, predominantly calcite (CaCO₃)) — sedimentary

Light-colored weathered stone, likely limestone

Limestone, predominantly calcite (CaCO₃)

Crinoid Fossil in Limestone (Crinoidea fossil (stalk segments) in Calcium Carbonate (CaCO3) matrix) — sedimentary

Crinoid Fossil in Limestone

Crinoidea fossil (stalk segments) in Calcium Carbonate (CaCO3) matrix

Silicified fossil-bearing limestone (likely chert/agate replacement) (Microcrystalline quartz (SiO₂) replacing carbonate rock; possible fossiliferous limestone) — sedimentary

Silicified fossil-bearing limestone (likely chert/agate replacement)

Microcrystalline quartz (SiO₂) replacing carbonate rock; possible fossiliferous limestone

White-veined gray limestone or marble (Calcite-rich carbonate rock; likely calcitic marble (CaCO₃)) — metamorphic

White-veined gray limestone or marble

Calcite-rich carbonate rock; likely calcitic marble (CaCO₃)

Crinoid fossil in limestone (Crinoidea fossil, commonly preserved in bioclastic calcitic limestone (CaCO₃)) — fossil

Crinoid fossil in limestone

Crinoidea fossil, commonly preserved in bioclastic calcitic limestone (CaCO₃)

Fossiliferous limestone (Bioclastic limestone, commonly crinoidal or shelly limestone (calcite, CaCO₃)) — sedimentary

Fossiliferous limestone

Bioclastic limestone, commonly crinoidal or shelly limestone (calcite, CaCO₃)

Rounded limestone pebble (Calcite-rich micritic limestone (CaCO₃), possibly a fossiliferous limestone) — sedimentary

Rounded limestone pebble

Calcite-rich micritic limestone (CaCO₃), possibly a fossiliferous limestone

Rounded limestone pebble (Limestone, composed chiefly of calcite (CaCO₃)) — sedimentary

Rounded limestone pebble

Limestone, composed chiefly of calcite (CaCO₃)

Weathered limestone or calcareous sandstone (Calcite-dominated carbonate rock (CaCO₃), possibly fossiliferous limestone) — sedimentary

Weathered limestone or calcareous sandstone

Calcite-dominated carbonate rock (CaCO₃), possibly fossiliferous limestone

Weathered quartz-rich rock, possibly chert or silicified limestone (Microcrystalline quartz (SiO₂), with probable calcite and iron-oxide impurities) — sedimentary

Weathered quartz-rich rock, possibly chert or silicified limestone

Microcrystalline quartz (SiO₂), with probable calcite and iron-oxide impurities

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 (Limestone (composed primarily of calcite with included fossils CaCO3)) — Sedimentary

Fossiliferous Limestone

Limestone (composed primarily of calcite with included fossils CaCO3)

Sphalerite (Zinc Sulfide (ZnS)) — mineral

Sphalerite

Zinc Sulfide (ZnS)

Geode Nodule Fragment (Quartz / Chalcedony Nodule) — sedimentary

Geode Nodule Fragment

Quartz / Chalcedony Nodule

Fossiliferous Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Fossiliferous Limestone

Calcium Carbonate (CaCO3)

Chert Concretion (Microcrystalline Quartz (SiO2)) — sedimentary

Chert Concretion

Microcrystalline Quartz (SiO2)

Fossilized echinoid (sea urchin), likely a flint/chalk-associated test (Echinoid fossil; likely a regular echinoid such as Echinocidaris or related taxon, composed mainly of recrystallized calcite (CaCO₃)) — fossil

Fossilized echinoid (sea urchin), likely a flint/chalk-associated test

Echinoid fossil; likely a regular echinoid such as Echinocidaris or related taxon, composed mainly of recrystallized calcite (CaCO₃)

Crushed Stone Ballast (Crushed Limestone or Granite Aggregate) — sedimentary

Crushed Stone Ballast

Crushed Limestone or Granite Aggregate

Fossil Coral (Petoskey Stone or Favosites) (Favosites (specifically Hexagonaria percarinata if silica-replaced Michigan type)) — sedimentary

Fossil Coral (Petoskey Stone or Favosites)

Favosites (specifically Hexagonaria percarinata if silica-replaced Michigan type)

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

Chert (Flint)

Microcrystalline Quartz (SiO2)

Calcite fragment (Calcite, calcium carbonate (CaCO₃)) — mineral

Calcite fragment

Calcite, calcium carbonate (CaCO₃)

Chert (Flint variety) (Chert (SiO2)) — sedimentary

Chert (Flint variety)

Chert (SiO2)

Tumbled white/yellow stone, likely calcite or marble (Calcite (CaCO₃), possibly crystalline limestone or marble) — mineral

Tumbled white/yellow stone, likely calcite or marble

Calcite (CaCO₃), possibly crystalline limestone or marble

Chert (Flint) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Lapis Lazuli (Lapis lazuli (primary mineral: Lazurite, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)) — metamorphic

Lapis Lazuli

Lapis lazuli (primary mineral: Lazurite, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Coquina (Biogenic Limestone (Coquina)) — sedimentary

Coquina

Biogenic Limestone (Coquina)

Limestone Cobble (Sedimentary Limestone (CaCO3)) — sedimentary

Limestone Cobble

Sedimentary Limestone (CaCO3)

Limestone with fossiliferous textures (Bioclastic Limestone (CaCO3)) — sedimentary

Limestone with fossiliferous textures

Bioclastic Limestone (CaCO3)

Limestone with Fossil Fragments (Bioclastic Limestone (CaCO3)) — sedimentary

Limestone with Fossil Fragments

Bioclastic Limestone (CaCO3)