Fossil coral fragment
Likely calcitic colonial coral, possibly fossilized scleractinian coral
fossil
Category
Organic (Biological Specimen)
Browse organic (biological specimen) specimens identified by the Rock Identifier community.
Dendritic Agate or Manganese Nodule in Chert/Limestone
Silicon Dioxide (SiO2) with Manganese Oxide (MnO2) inclusions
sedimentary
Fossil Shark Tooth (Otodus obliquus)
Otodus obliquus; hydroxyapatite (mineralized form Ca5(PO4)3(OH))
sedimentary (fossiliferous)
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Northern Shoveler Duck (Note: This is a biological specimen, not a rock)
Spatula clypeata
not a rock (biological/ornithological)
Amber
Succinite (with approximate formula C10H16O)
mineraloid
Chert (Black Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Optical Calcite
Calcium Carbonate (CaCO3)
mineral
Kidney Stone (Calcium Oxalate / Uric Acid)
Calcium Oxalate Monohydrate (Whewellite) / Calcium Oxalate Dihydrate (Weddellite)
mineral
Fossilized tooth or tooth fragment
Indeterminate vertebrate tooth; likely mammalian, mineralized hydroxyapatite
fossil
Fossiliferous Concretion
Septarian Concretion containing Brachiopods/Crinoids
fossil
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Limestone (Concretionary or Tufa)
Calcium Carbonate (CaCO3)
sedimentary
Amber
Amber (C10H16O)
mineral
Fossilized Shark Tooth
Carcharhinus sp. (likely Bull or Requiem shark family)
sedimentary
Fossiliferous Limestone
Carbonate sedimentary rock (CaCO3)
sedimentary
Shark Tooth Fossil
Carcharhiniformes or Lamniformes (order level fossil)
fossil
Limestone (Flagstone)
Fossiliferous Limestone (CaCO3)
sedimentary
Fossil Shark Tooth
Chondrichthyes (Class)
fossil
Chalcedony (Agate/Seashell replacement)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Bay Scallop Shell
Argopecten irradians (Biogenic Calcium Carbonate / CaCO3)
sedimentary
Chert / River Cobble
Microcrystalline Quartz (SiO2)
sedimentary
Crinozoan fossil (Crinoid stem fragment)
Crinoid (Class Crinoidea)
fossil
Amber
Succinite (C10H16O)
Mineraloid
Fossilized Coral in Chert
Anthozoa (Class) fossil in Cryptocrystalline Quartz (SiO2)
fossil
Limestone with Fossil Inclusion
Calcium Carbonate (CaCO3) - Bioclastic Limestone
sedimentary
Amber
Succinite (fossilized resin)
mineral
Amber
Succinite (fossilized resin)
mineral
Fossiliferous Limestone (containing Brachiopods)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Coprolite
Coprolite (fossilized feces)
sedimentary
Amber
Succinite (with approximate formula C10H16O)
mineraloid
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone (with biological crust)
Arenite (SiO2 based)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Silicified Snail Fossil
Gastropod (likely replaced by Chalcedony/Quartz - SiO2)
fossil
Fossil Shark Tooth
Squalicorax (likely Squalicorax pristodontus or Squalicorax falcatus)
fossil
Fossilized cylindrical shell or bone fragment
Indeterminate biogenic carbonate or phosphatic fossil; possible fragment of a tubular shell (e.g., scaphopod) or hollow bone
fossil
Fossil bivalve shell
Likely an internal mold or mineralized shell of a brachiopod or small bivalve; exact taxonomy requires locality and diagnostic details
fossil
Tufa (Calcareous Tufa)
Calcareous Tufa (Precipitated CaCO3)
sedimentary
Amber
Succinite (organic fossilized resin)
mineraloid
Conglomerate with Fossilized Shark Teeth
Clastic sedimentary rock (Conglomerate) containing Elasmobranchii remains
sedimentary
Amber
Succinate (Organic Fossilized Resin)
mineraloid