Bivalve Shell (Fossil or Contemporary)
Class Bivalvie (various genera and species of clams, cockles, etc.)
Category
Browse sedimentary (biogenic sediment or biological remain) specimens identified by the Rock Identifier community.
Bivalve Shell (Fossil or Contemporary)
Class Bivalvie (various genera and species of clams, cockles, etc.)
Spondylus Oyster Calcification / Fossilized Oyster
Spondylus (Thorny Oyster) / Calcium Carbonate (CaCO3)
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
Seashell Fragment (Aragonite/Calcite)
Calcium Carbonate (CaCO3) - Shell fragment
Zebra Rock (Zebra Stone / Ribbon Stone)
Siltstone with Ferruginous Banding (Primarily Quartz, Kaolinite, and Hematite)
Human Skin (Epidermis/Dermis)
Integumentary tissue (High content of hydroxyapatite in bones, though the surface is biological)
Petrified Wood
Silicified Wood (SiO2)
Fossiliferous Limestone with Brachiopod
Phylum Brachiopoda in calcitic matrix
Fossiliferous Limestone (with Crinoids/Coral)
Fossiliferous Limestone (CaCO3)
Pearl
Pearl (Calcium Carbonate with organic conchiolin, CaCO3)
Geode with Quartz and Chalcedony
Silicon Dioxide (SiO2)
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
Fossilized Shell in Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
Coralline Algae / Maerl
Lithothamnion (Biogenic Calcium Carbonate)
Fossiliferous Limestone
Calcium Carbonate - CaCO3
Fossil Coral
Cnidaria fossil (often Calcium Carbonate / CaCO3)
Fossilized Brachiopod Shell in Matrix
Phylum Brachiopoda (typically Calcium Carbonate or Chitinophosphatic)
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
Water and Silt (Sedimentary Environment)
Suspended Sediment / H2O (dihydrogen monoxide)
Coral Rock (Coquina)
Biogenic Limestone (Calcium Carbonate - CaCO3)
Fossiliferous Chert (Gryphaea Fossil)
Silicon Dioxide (SiO2) with Calcitic Mollusk Remnants
Limestone (Flagstone)
Fossiliferous Limestone (CaCO3)
Gastropod Steinkern (Internal Mold Fossil)
Gastropoda (Class); Internal mold or 'Steinkern' composed of Calcium Carbonate (CaCO3) or Sedimentary matrix
Fossiliferous Chert (with Fossil Shells)
Silicon Dioxide (SiO2) with biogenic inclusions
Pearl (in a decorative hair comb setting)
Calcium carbonate (CaCO3) primarily as Aragonite, bonded with Conchiolin
Granitic Sand
Detrital sediment (predominantly Quartz, Feldspar, and Mica)
Pearl
Aragonite and Calcite (CaCO3) with Conchiolin
Pyrite
Iron Sulfide (FeS2)
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
Hag Stone (Banded Chert or Limestone with Borehole)
Microcrystalline Quartz (Chert) or Calciferous Siltstone (CaCO3/SiO2)
Bay Scallop Shell
Argopecten irradians (Biogenic Calcium Carbonate / CaCO3)
Oyster Shell (Aragonite/Calcite)
Calcium Carbonate (CaCO3)
Brachiopod Fossil
Phylum Brachiopoda (likely Order Rhynchonellida or Spiriferida)
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
Fossiliferous Limestone (Shell Fragment)
Biogenic Limestone (Calcium Carbonate / CaCO3)
Jasper containing fossilized inclusions
Silicon Dioxide (SiO2) with trace impurities and biogenic inclusions
Sea Shell (Fighting Conch Fragment)
Calcium Carbonate (CaCO3) - Strombus alatus fragment
Fossil Bivalve Shell
Class Bivalvia (e.g., Veneriidae family)
Petrified Wood (Agatized/Silicified Wood)
Silicified Wood / Chalcedony (SiO2)
Fossiliferous Limestone (containing Brachiopods)
Biogenic Limestone (Calcium Carbonate, CaCO3)
Conglomerate
Conglomerate (clastic sedimentary rock)
Fossil Shell in Sedimentary Matrix
Bivalvia (fossil) in Calcium Carbonate Matrix