Calcareous Tufa / Limestone Fragment
Calcium Carbonate (CaCO3)
sedimentary
Category
Sedimentary (Fossilized Organic Matter)
Browse sedimentary (fossilized organic matter) specimens identified by the Rock Identifier community.
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Fossilized Shark Tooth
Elasmobranchii fossil (likely Odontaspididae family)
sedimentary
Fossilized Coral (Favosites)
Favosites (extinct genus of tabulate coral)
sedimentary
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Ammonite Fossil (Small Pyritized or Calcitized Internal Mold)
Ammonoidea
sedimentary
Amber (likely a small rough amber piece)
Fossilized plant resin; amber is an organic mineraloid, not a crystalline mineral
gemstone
Graphite Schist
C (Carbonaceous Schist)
metamorphic
Fossilized Oyster Shell (Limestone/Coquina)
Crassostrea (Fossilized Bivalve), Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossilized Shark Tooth
Carcharhinus sp. (likely Bull or Requiem shark family)
sedimentary
Shark Tooth Fossil
Carcharhiniformes or Lamniformes (order level fossil)
fossil
Fossil shell fragment, likely brachiopod or bivalve
Indeterminate fossilized marine mollusk or brachiopod; mineralized calcite shell in a carbonate matrix
fossil
Amber
Fossilized Resin (C10H16O)
mineral
Amber
Succinite (Fossilized Resin)
mineral
Amber
Succinite (C10H16O)
mineral
Sandy Ironstone
Ferruginous Sandstone
sedimentary
Fancy Jasper
Silicon dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
mineral
Carnelian (Orange Chalcedony)
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2 / Quartz pseudomorph after wood)
fossil
Fossilized Bone Fragment
Vertebrate Fossil Material (Apatite/Calcium Phosphate)
fossil
Fossilized Plant or Tree Bark
Lepidodendron or Sigillaria (example genera)
sedimentary
Fossilized Bone Fragment
Permineralized Vertebrate Fossil (Hydroxyapatite replaced by Minerals)
sedimentary
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Megalodon Shark Tooth (Partial Fossil)
Otodus megalodon (fossilized in Calcium Phosphate/Apatite)
Mineral/Fossil
Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Travertine (often colloquially called Tufa)
Chemical Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Fossilized Bivalve Shell
Bivalvia (Phylum Mollusca)
fossil
Botiroidal Chalcedony or Silicified Fossil Coral
Silicon Dioxide (SiO2) - Chalcedony / Scleractinia (if fossilized)
sedimentary
Fossilized Shark Tooth
Scapanorhynchus (Sand Tiger Shark relative)
sedimentary
Moss Agate
Silicon Dioxide with inclusions (SiO2 + impurities)
mineral
Bivalve Fossil (Fossilized Shell)
Class Bivalvia (fossilized in Calcium Carbonate/Aragonite)
fossil
Petrified Wood
Silicified Wood (SiO2 permineralization)
fossil
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Amber
Succinite (specifically for Baltic Amber), Formula: C10H16O
Organic Gemstone (often associated with Sedimentary sequences)
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Fossilized Shark Tooth
Chondrichthyes tooth
fossil
Coal (most likely Bituminous or Anthracite)
Coal (organic sedimentary rock)
Sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Shungite
Shungite (Non-crystalline carbon, C)
mineral