Coquina Limestone (Fossiliferous Limestone)
Calcareous bioclastic sedimentary rock (CaCO3)
sedimentary
Category
Limestone
Browse limestone specimens identified by the Rock Identifier community.
Limestone (specifically Chalky Limestone)
Calcium Carbonate (CaCO3 / Calcite)
sedimentary
Fossiliferous Limestone (Crinoidal Limestone)
Calcium Carbonate with Crinoid Stem Fossils (CaCO3)
sedimentary
Chert (or Fossiliferous Limestone)
Microcrystalline Quartz (SiO2) / Calcium Carbonate (CaCO3)
sedimentary
Septarian (Dragon Stone)
Septarian Concretion (SiO2 + CaCO3)
sedimentary
Hag Stone (Piddock bored rock)
Calcareous sedimentary rock featuring Pholadidae borings
sedimentary
Fossilized Gastropod Internal Mold
Steinkern (Mollusca: Gastropoda)
sedimentary
Septarian Nodule (Dragon Stone)
Carbonate concretion (Calcite and Aragonite in Limestone/Clay)
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Lapis Lazuli
Lapis Lazuli (Complex aggregate of Lazurite (Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2, Pyrite, and Calcite)
metamorphic
Chert (Field Stone)
Microcrystalline Quartz (SiO2)
sedimentary
Galena
Lead(II) sulfide (PbS)
mineral
Limestone (River or Sea Cobble)
Calcium Carbonate (CaCO3)
sedimentary
Limestone Cobble
Carbonate Rock (CaCO3)
sedimentary
Travertine
Terrestrial Sedimentary Limestone (CaCO3)
sedimentary
River Cobble (likely Quartzite or Limestone)
SiO2 (Quartzite dominant) or CaCO3 (Limestone dominant)
metamorphic or sedimentary
Chert with Limestone Cortex
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Fossiliferous Limestone
Fossiliferous Calcarenite (CaCO3)
sedimentary
Fossil Coral
Scleractinia (Anthos), primarily Calcium Carbonate (CaCO3)
sedimentary
Fossilized Coral (Favosites)
Favosites (extinct genus of tabulate coral)
sedimentary
Calcite
Calcium Carbonate (CaCO3)
mineral
Blue Apatite
Apatite-(CaF), Ca5(PO4)3F (Calcium Fluorophosphate)
mineral
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Limestone with Chert
Sedimentary Rock (CaCO3 with SiO2 inclusions)
sedimentary
Breciated Limestone with Calcite Veins
Sedimentary Breccia (CaCO3)
sedimentary
Trilobite Fossil
Trilobita (Class), likely Phacopid or Asaphid order
sedimentary
Limestone (specifically a Crushed Aggregate fragment)
Calcium Carbonate (CaCO3)
sedimentary
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
White Calcite (Dogtooth Spar or Crystalline Calcite)
Calcite (Calcium Carbonate, CaCO3)
mineral
Seashell Fragment (Aragonite/Calcite)
Calcium Carbonate (CaCO3) - Shell fragment
sedimentary
Brown Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert / Flint
Microcrystalline or cryptocrystalline quartz (SiO2)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Limestone (Riprap)
Calcium Carbonate (CaCO3)
sedimentary
Fossiliferous Limestone
Sedimentary rock containing Indeterminate Fossil remains (likely Crinoid stem or Bryozoan fragment)
fossil
Limestone Pebble
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Fossiliferous Limestone
Fossiliferous Limestone (Sedimentary Rock)
fossil
Crushed Limestone
Calcium Carbonate (CaCO3)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary