Chert (and Flint)
Silicon Dioxide (SiO2)
sedimentary
Category
Mineralized Fossil
Browse mineralized fossil specimens identified by the Rock Identifier community.
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Chert (Iron-stained)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Red Shale
Lutite (primarily composed of clay minerals and iron oxides like hematite, Fe2O3)
sedimentary
Fossil Coral (Petoskey Stone or similar)
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Petrified Wood
Silicified Wood (SiO2 permineralization)
sedimentary
Red Jasper with Fossils
Silicified Fossiliferous Jasper (Chert variant, SiO2)
sedimentary
Brachiopod Fossil (Spiriferid)
Phylum Brachiopoda, Order Spiriferida (CaCO3 - Calcium Carbonate)
sedimentary (fossilized organic remains)
Red Mudstone (Siltstone)
Lutite (primarily Quartz and Clay minerals with Hematite)
sedimentary
Limestone or Chalk
Calcium Carbonate (CaCO3)
sedimentary
Stromatolite (Jasper-replaced)
Fossilized Stromatolite (Cyanobacteria / Cryptozon / Silica SiO2)
sedimentary
Ammonite Fossil (Polished Half)
Ammonoidea (subclass)
sedimentary
Pyrite in Shale
Iron Disulfide (FeS2) in Argillaceous Shale
sedimentary
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Crinoid Stem Fragment
Crinoid (Phylum Echinodermata, Class Crinoidea)
sedimentary
Petrified Wood
Silicified Wood (SiO2 - Silicon Dioxide)
mineral
Shale
Fissile mudstone (rich in clay minerals and quartz)
sedimentary
Honeycomb Coral Fossil
Favosites (extinct genus of tabulate coral)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Petrified Wood (Calamites Fossil)
Calamites sp. (Silicified/Permineralized Plant Fossil)
sedimentary
Sandstone Pebble
Arenite (primarily SiO2)
sedimentary
Shale (possibly)
Shale (fine-grained clastic sedimentary rock)
sedimentary
Sandstone
Arenite
sedimentary
Chert / Flint Conglomerate
Silicified Sedimentary Breccia (primarily SiO2)
sedimentary
Ironstone Concretion / Goethite Nodules
Ironstone (composed primarily of Goethite FeO(OH) and Limonite)
sedimentary
Amber
Succinite
Organic Mineral
Chert Pebble
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Red Sandstone
Arenite with Hematite cementation
sedimentary
Sandstone
Clastic Sedimentary Rock (composed primarily of Quartz: SiO2)
sedimentary
Shale
Fissile Siliciclastic Sedimentary Rock
sedimentary
Ironstone Concretion (Ironstone Gourd)
Limonite/Goethite Concretion (FeOO(H))
sedimentary
Gastropod Fossil (Snail)
Gastropoda (Internal mold/Steinkern)
sedimentary
Sandstone (likely Arkosic or Quartzose)
Sandstone (SiO2 with inclusions)
sedimentary
Iridescent Ammonite Fossil
Ammonoidea (subclass); Composition: Aragonite (Calcium Carbonate, CaCO3) often replaced by Calcite or Pyrite
sedimentary
Sandstone (Red Sandstone)
Arenite
sedimentary
Favosites (Fossil Coral)
Favosites (Extinct Tabulate Coral)
sedimentary
Crinoid Fossil Limestone
Crinoidal Limestone (Calcite / CaCO3)
sedimentary
Spinosaurus Tooth Fossil
Spinosaurus aegyptiacus (Calcium Phosphate/Apatite)
sedimentary
Belemnite Fossil (Guard)
Belemnoidea (Carbonate/Calcite replacement)
sedimentary
Rugose Coral Fossil
Rugosa (Order)
sedimentary