Coral Rock (Coquina)
Biogenic Limestone (Calcium Carbonate - CaCO3)
sedimentary
Category
Sedimentary (Biogenic Sediment Or Biological Remain)
Browse sedimentary (biogenic sediment or biological remain) specimens identified by the Rock Identifier community.
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Chert (Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Shark Tooth
Carcharocles sp. or similar (Fossilized Fluorapatite)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Marine gastropod shell
Calcareous mollusk shell, primarily aragonite (CaCO₃), likely a whelk or conch
fossil
Likely weathered chert or siliceous shale
Cryptocrystalline quartz (SiO₂), possibly with clay minerals
sedimentary
Limestone with Fossil Imprints
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Chert (Flint / Agate Nodule)
Silicon Dioxide (SiO2)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Fossiliferous Chert (with Fossil Shells)
Silicon Dioxide (SiO2) with biogenic inclusions
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossiliferous Limestone
Bioclastic Limestone (CaCO3)
sedimentary
Green Chert
Microcrystalline Quartz (SiO2)
sedimentary
Land Snail Shell
Gastropoda (Calcium Carbonate, CaCO3)
fossil
Bay Scallop Shell
Argopecten irradians (Biogenic Calcium Carbonate / CaCO3)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Petrified Wood Fragment
Silicified Wood (SiO2)
fossil
Coquina
Biogenic Limestone (Coquina)
sedimentary
Kidney Stone (Urolith)
Calculus renalis (Biogenic mineral aggregate)
mineral
Chert (likely jasper-bearing chert)
Microcrystalline quartz (SiO₂), with iron-oxide staining and possible chalcedony
sedimentary
Chert (or Petrifed Wood / Banded Flint)
Silicon Dioxide (SiO2)
sedimentary
Pale limestone or calcite-rich rock
Calcite (CaCO₃), likely micritic limestone
sedimentary
Fossilized Echinoid (Sea Urchin)
Echinoidea (Class)
sedimentary
Fossiliferous Limestone
Biogenic Limestone with Brachiopod/Crinoid fragments
sedimentary
Bivalve Fossil (Shell-bearing Sedimentary Rock)
Class Bivalvia (Phylum Mollusca) within a Calcarenite/Sandstone matrix
fossil
Chert or flint fragment
Microcrystalline quartz (SiO₂), often with chalcedony
sedimentary
Fossiliferous Limestone (containing Brachiopods)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Kidney Stone (Urolith / Calcium Oxalate Stone)
Calcium Oxalate Monohydrate (Whewellite) / Calcium Oxalate Dihydrate (Weddellite)
mineral
Pearl (in a decorative hair comb setting)
Calcium carbonate (CaCO3) primarily as Aragonite, bonded with Conchiolin
Organic Mineraloid
Pearl
Aragonite and Calcite (CaCO3) with Conchiolin
mineral
Brachiopod Fossil
Phylum Brachiopoda (likely Order Rhynchonellida or Spiriferida)
sedimentary
Fossiliferous Limestone
Calcium Carbonate - CaCO3
sedimentary
Fossil-bearing Sedimentary Rock
Sedimentum cum fossili
fossil
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
Fossiliferous Concretion
Septarian Concretion containing Brachiopods/Crinoids
fossil
Brachiopod or Bivalve Fossil in Limestone
Phylum Brachiopoda or Bivalvia (embedded in Calcium Carbonate matrix)
fossil
Fossil tooth, possibly a shark tooth
Unidentified fossilized vertebrate tooth; species cannot be determined from the image
fossil
Jasper (or Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Shell in Limestone
Carbonate sedimentary rock with Bivalvia or Brachiopoda remains
fossil
Calcite-rich limestone (possibly fossiliferous limestone)
Calcite, CaCO₃, in a limestone matrix
sedimentary
Banded chert pebble
Microcrystalline quartz (SiO₂), likely ferruginous or jaspery chert
sedimentary