Anthracite Coal
Anthracite (Metamorphosed Carbon)
sedimentary
Category
Sedimentary (Fossilized Organic Matter)
Browse sedimentary (fossilized organic matter) specimens identified by the Rock Identifier community.
Learn about Sedimentary (Fossilized Organic Matter) in the encyclopedia
View all →
Fossil Shark Tooth (embedded in matrix)
Lamniformes (likely Cretalamna or Squalicorax) within phosphatic/calcareous matrix
sedimentary
Amber
Fossilized Tree Resin (Succinite)
mineraloid
Fossil Shark Tooth
Odontaspididae (Sand Tiger Shark family)
fossil
Chert (Agatized/Chalcedony variety)
Microcrystalline Quartz (SiO2)
sedimentary
Brachiopod Fossil
Phylum Brachiopoda
fossil
Echinoid Fossil (Fossilized Sea Urchin)
Echinoidea
fossil
Coral Fossil (Favosites)
Favosites (Calcite/Calcium Carbonate, CaCO3)
sedimentary
Fossil Coral (Petoskey Stone / Rugose Coral)
Hexagonaria percarinata (Order: Rugosa, Fossilized Calcium Carbonate CaCO3)
sedimentary
Turritella Agate / Fossiliferous Limestone
Elimia tenera in Chalcedony/Calcite Matrix
fossil
Bivalve Fossil
Bivalvia (Phylum Mollusca)
Fossil
Gastropod shell fragment
Calcareous mollusk shell; primarily aragonite or calcite (CaCO₃)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossil Sand Dollar (Echinoidea)
Phylum Echinodermata, Class Echinoidea (likely Dendraster or Scutella)
sedimentary
Polished septarian nodule
Calcite–aragonite cemented carbonate concretion, commonly with clay minerals and iron oxides
sedimentary
Brachiopod Fossil in Matrix
Phylum Brachiopoda
fossil
Fulgurite
Lechatelierite
mineral
Vesicular Basalt (or Rhyolite)
Extrusive Igneous Rock with Vesicular Texture
igneous
Petoskey Stone
Hexagonaria percarinata
fossil
Crinoid Marble (Fossilized Limestone)
Crinoidal Limestone (comprising Calcite/Aragonite CaCO3)
sedimentary
Script Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Fossilized Sea Urchin (Echinoid)
Echinoidea (Class) - likely replaced by Calcite or Quartz
sedimentary
Fossil Coral (Rugose Coral / Horn Coral fragment)
Rugosa (Tetracoralla) / Calcite (CaCO3)
fossil
Conical fossil shell or shell fragment
Likely a gastropod shell fragment; exact taxon indeterminate from the image
fossil
Echinoid Fossil (Sea Urchin Fossil)
Echinoidea
fossil
Petoskey Stone
Hexagonaria percarinata
fossil
Rugose Coral (Horn Coral) Fossil in Limestone
Order Rugosa (commonly Grewingkia or Zaphrentis genus)
sedimentary
Fossilized trilobite
Trilobita; likely an enrolled asaphid or phacopid trilobite
fossil
Fossilized ammonite
Ammonoidea (likely a ribbed Jurassic–Cretaceous ammonite), replaced mainly by calcite or silica
fossil
Fossilized Coral
Rugosa or Tabulate Coral Fossil (Replacement by Silica/Calcite)
fossil
Fossilized Brachiopod
Brachiopoda (likely Order Spiriferida or Productida)
fossil
Fulgurite
Fulgurite (Lechatelierite or fused sand/quartz)
mineral
Dendritic Opal
Dendritic Common Opal (SiO2·nH2O with Manganese oxide inclusions)
mineral
Shale (possibly)
Shale (fine-grained clastic sedimentary rock)
sedimentary
Petoskey Stone (Hexagonaria coral fossil)
Hexagonaria percarinata
sedimentary
Chondrite Meteorite
Ordinary Chondrite (S-type Asteroid fragment)
mineral
Chondrite Meteorite
L or H Ordinary Chondrite
igneous
Fossilized Coral (Rugose Coral / Horn Coral)
Rugosa / Scleractinia
fossil
Anthracite Coal
Coal (predominantly carbon)
sedimentary
Petoskey Stone
Hexagonaria percarinata (Silicified/Calcitic)
fossil
Coral Fossil
Anthozoa (order Scleractinia)
fossil
Fossilized Echinoid (Sea Urchin)
Echinoidea (Class), often found as calcitic fossils
sedimentary