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

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

Chert (Flint variety)

Microcrystalline Silica (SiO2)

Chert (Nodule) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Nodule)

Silicon Dioxide (SiO2)

White limestone, possibly chalky limestone (Calcite-rich carbonate rock; predominantly calcium carbonate (CaCO₃)) — sedimentary

White limestone, possibly chalky limestone

Calcite-rich carbonate rock; predominantly calcium carbonate (CaCO₃)

Limestone (River Pebble) (Calcium Carbonate (CaCO3)) — sedimentary

Limestone (River Pebble)

Calcium Carbonate (CaCO3)

Likely calcite-rich limestone or marble (Calcite (CaCO₃); possibly recrystallized limestone (marble)) — metamorphic

Likely calcite-rich limestone or marble

Calcite (CaCO₃); possibly recrystallized limestone (marble)

Chert (Limestone Nodule) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Limestone Nodule)

Silicon Dioxide (SiO2)

Likely tumbled yellow calcite or limestone fragment (Calcite (CaCO₃), possibly micritic limestone) — mineral

Likely tumbled yellow calcite or limestone fragment

Calcite (CaCO₃), possibly micritic limestone

Limestone Pebble (Calcium Carbonate (CaCO3)) — sedimentary

Limestone Pebble

Calcium Carbonate (CaCO3)

Limestone or Chalk (Calcium Carbonate (CaCO3)) — sedimentary

Limestone or Chalk

Calcium Carbonate (CaCO3)

Limestone (specifically fossiliferous/skeletal limestone) (Calcium Carbonate (CaCO3)) — sedimentary

Limestone (specifically fossiliferous/skeletal limestone)

Calcium Carbonate (CaCO3)

Chert (Cryptocrystalline quartz (SiO2)) — sedimentary

Chert

Cryptocrystalline quartz (SiO2)

Limestone (with weathering rind) (Calcium Carbonate (CaCO3)) — sedimentary

Limestone (with weathering rind)

Calcium Carbonate (CaCO3)

Fossiliferous Limestone Pebble (Sedimentary Rock (CaCO3)) — sedimentary

Fossiliferous Limestone Pebble

Sedimentary Rock (CaCO3)

Fossiliferous Limestone (CaCO3 (principally Calcite or Aragonite)) — sedimentary

Fossiliferous Limestone

CaCO3 (principally Calcite or Aragonite)

Iron-stained chert or chalcedony nodule (Microcrystalline quartz (SiO₂), likely chert with chalcedonic silica and iron-oxide staining) — sedimentary

Iron-stained chert or chalcedony nodule

Microcrystalline quartz (SiO₂), likely chert with chalcedonic silica and iron-oxide staining

Chert (flint), likely with iron-stained weathering rind (Microcrystalline quartz/chalcedony (SiO₂)) — sedimentary

Chert (flint), likely with iron-stained weathering rind

Microcrystalline quartz/chalcedony (SiO₂)

Fossil Coral (Petoskey Stone / Rugose Coral) (Hexagonaria percarinata (or similar fossilized rugose/tabulate coral)) — fossil

Fossil Coral (Petoskey Stone / Rugose Coral)

Hexagonaria percarinata (or similar fossilized rugose/tabulate coral)

Chert Nodule (Microcrystalline Quartz (SiO2)) — sedimentary

Chert Nodule

Microcrystalline Quartz (SiO2)

Fossil Coral (Tabulate Coral (potentially Favosites or Calapoecia)) — fossil

Fossil Coral

Tabulate Coral (potentially Favosites or Calapoecia)

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

Chert (Flint)

Microcrystalline or cryptocrystalline quartz (SiO2)

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

Chert (Flint)

Silicon Dioxide (SiO2)

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

Chert (within Limestone matrix)

Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)

Tumbled fossil-bearing limestone (likely crinoid or shell fragment) (Fossil carbonate; predominantly calcite (CaCO₃)) — fossil

Tumbled fossil-bearing limestone (likely crinoid or shell fragment)

Fossil carbonate; predominantly calcite (CaCO₃)

Flint (Silicon dioxide (SiO2) - cryptocrystalline quartz) — sedimentary

Flint

Silicon dioxide (SiO2) - cryptocrystalline quartz

Chert (with Limestone/Carbonate matrix) (Sedimentary cryptocrystalline silica (SiO2)) — sedimentary

Chert (with Limestone/Carbonate matrix)

Sedimentary cryptocrystalline silica (SiO2)

Quartz Geode (Silicon Dioxide (SiO2) in a concretion) — sedimentary

Quartz Geode

Silicon Dioxide (SiO2) in a concretion

Chert (Jasper/Flint variety) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Chert (and Flint variant) (Silicon Dioxide (SiO2)) — sedimentary

Chert (and Flint variant)

Silicon Dioxide (SiO2)

Banded limestone or marble (Calcite-dominated carbonate rock; likely banded marble (CaCO₃)) — metamorphic

Banded limestone or marble

Calcite-dominated carbonate rock; likely banded marble (CaCO₃)

Light-colored weathered stone, possibly limestone or quartz-rich rock (Indeterminate; likely calcitic limestone (mostly CaCO₃) or quartz sandstone (SiO₂)) — sedimentary

Light-colored weathered stone, possibly limestone or quartz-rich rock

Indeterminate; likely calcitic limestone (mostly CaCO₃) or quartz sandstone (SiO₂)

Crystalline limestone (marble-like calcite rock) (Calcite, CaCO₃; likely recrystallized limestone (marble)) — metamorphic

Crystalline limestone (marble-like calcite rock)

Calcite, CaCO₃; likely recrystallized limestone (marble)

Limestone (Crushed Gravel) (Limestone (Calcium Carbonate, CaCO3)) — sedimentary

Limestone (Crushed Gravel)

Limestone (Calcium Carbonate, CaCO3)

Chalky limestone (Micritic limestone, primarily calcite (CaCO₃)) — sedimentary

Chalky limestone

Micritic limestone, primarily calcite (CaCO₃)

Wollastonite (Calcium Inosilicate Mineral, CaSiO3) — mineral

Wollastonite

Calcium Inosilicate Mineral, CaSiO3

Weathered fossiliferous limestone, possibly coral or stromatoporoid (Calcitic limestone, predominantly CaCO₃; fossil identity cannot be confirmed from one photograph) — sedimentary

Weathered fossiliferous limestone, possibly coral or stromatoporoid

Calcitic limestone, predominantly CaCO₃; fossil identity cannot be confirmed from one photograph

Likely weathered flint or chert fragment (Cryptocrystalline quartz (SiO₂), possibly siliceous chert/flint) — sedimentary

Likely weathered flint or chert fragment

Cryptocrystalline quartz (SiO₂), possibly siliceous chert/flint

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

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert (Jasper/Flint Pebble) (Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)) — sedimentary

Chert (Jasper/Flint Pebble)

Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)

Chert (variations include Flint or Jasper) (Chert (Silicon Dioxide, SiO2)) — sedimentary

Chert (variations include Flint or Jasper)

Chert (Silicon Dioxide, SiO2)

Chert (Flint nodule) (Chert (SiO2)) — sedimentary

Chert (Flint nodule)

Chert (SiO2)

Charoite (Charoite, K(Ca,Na)2Si4O10(OH,F)·H2O) — metamorphic

Charoite

Charoite, K(Ca,Na)2Si4O10(OH,F)·H2O

Banded Onyx (Calcite Marble) (Calcite (CaCO3) - Trap-rock or Cave Onyx) — sedimentary

Banded Onyx (Calcite Marble)

Calcite (CaCO3) - Trap-rock or Cave Onyx