Coral Rock (Coquina)
Biogenic Limestone (Calcium Carbonate - CaCO3)
sedimentary
Category
Sedimentary (Biogenic)
Browse sedimentary (biogenic) specimens identified by the Rock Identifier community.
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Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Biogenic Inclusions
sedimentary
Coquina
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Fossiliferous Limestone (Murchisonia/Gastropod Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Fossiliferous Limestone (Coquina)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Coquina or Fossilized Shell Fragment
Calcium Carbonate (CaCO3) / Biogenic Limestone
sedimentary
Fossiliferous Limestone (Coquina / Shell Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Coquina (Fossiliferous Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Coquina
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Oyster Shell (Aragonite/Calcite)
Calcium Carbonate (CaCO3)
sedimentary
Kidney Stone
Nephrolithiasis (Calcium Oxalate, Hydroxyapatite, or Uric Acid)
mineral
Fossiliferous Limestone
Limestone with fossil inclusions (CaCO3)
sedimentary
Fossiliferous Limestone
Limestone (CaCO3) with Crinoid/Bivalve fossils
sedimentary
Pale limestone or calcite-rich rock
Calcite (CaCO₃), likely micritic limestone
sedimentary
Chert / Flint (with Jasper inclusions)
Microcrystalline Quartz (SiO2)
sedimentary
Limestone with possible fossil inclusions
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Fossiliferous Limestone (or Bryozoan/Coral Fossil Pebble)
Biogenic Sedimentary Rock (Calcium Carbonate, CaCO3)
sedimentary
Fossil Coral
Coral Limestone (a type of biogenic sedimentary rock)
Sedimentary
Chalk / Sedimentary Limestone
Calcium Carbonate (CaCO3) - Biogenic Sedimentary Rock
sedimentary
Fossiliferous Limestone
Biogenic Sedimentary Rock (Calcium Carbonate with Fossils)
sedimentary
Fossiliferous Limestone
Biogenic Sedimentary Rock (Calcium Carbonate, CaCO3)
sedimentary
Stromatolite
Biogenic Sedimentary Rock (Lithified microbial mat)
sedimentary
Chalk (Calcitic)
Calcium Carbonate (CaCO3) - Biogenic Sedimentary Rock
sedimentary
Stromatolite
Biogenic Sedimentary Rock (Precambrian Stromatolite fossil)
sedimentary
Stromatolite
Laminated biogenic sedimentary structure (formed by Cyanobacteria)
sedimentary
Pearl jewelry
Pearl (biogenic calcium carbonate, primarily aragonite, CaCO₃)
gemstone
Flint (chert) with chalcedony/quartz
Microcrystalline quartz, SiO₂; likely flint or siliceous chert with a chalcedonic edge
sedimentary
Likely weathered gray flint/chert pebble
Microcrystalline quartz (SiO₂), commonly with chalcedony and minor impurities
sedimentary
Chert / Flint
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (varieties include Flint and Jasper)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Calcite
Calcium Carbonate (CaCO3)
mineral
Mother of Pearl (Nacre)
Aragonite with Conchiolin (CaCO3)
mineral
Chert or flint fragment
Microcrystalline quartz (SiO₂), likely chert/flint
sedimentary
Chert or flint fragment
Microcrystalline quartz (SiO₂), often with chalcedony
sedimentary
Banded Chert Pebble
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (often called Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert / Flint
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Crinoid Fossil Marble
Crinoidal Limestone / Phylum Echinodermata
sedimentary
Chert or microcrystalline quartz fragment
Chert; cryptocrystalline SiO₂, possibly chalcedony-rich
sedimentary