Fossilized Echinoid (Sea Urchin) or Brachiopod
Echinoidea / Invertebrate Fossil
fossil
Category
Sedimentary (Fossilized)
Browse sedimentary (fossilized) specimens identified by the Rock Identifier community.
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Fossilized bivalve shell fragment
Fossil Mollusca, likely a bivalve (class Bivalvia); exact genus cannot be determined from the image
fossil
Petrified Coral (Agatized Coral)
Anthozoa (Agatized Fossil)
sedimentary
Honeycomb Coral Fossil (Favosites)
Favosites alpenensis
sedimentary
Polished petrified wood
Silicified wood, primarily microcrystalline quartz (SiO₂) replacing organic tissue
fossil
Fossilized tooth, likely a mammalian tooth fragment
Indeterminate fossil tooth; possibly an ungulate or carnivoran tooth
fossil
Fossil Coral
Hexagonaria / Rugose coral (Fossilized calcium carbonate)
fossil
Amber
Organic gemstone (Succinite is common if from the Baltic)
mineral
Amber
Succinite (with formula approximately C10H16O)
Organic mineraloid
Picture Jasper
Silicon Dioxide (SiO2) - Opaque Impure Chalcedony
sedimentary
Mookaite (Mookaite Jasper)
Silicified Radiolarite (SiO2 with iron oxides)
sedimentary
Fossilized Bone (Petrified Bone)
Permineralized Bone Fossil
fossil
Sandstone (Quartzose / Feldspathic Sandstone)
Arenite (SiO2 principal matrix)
sedimentary
Amber
Succinite
mineral
Amber
Succinite (specifically for Baltic Amber), Formula: C10H16O
Organic Gemstone (often associated with Sedimentary sequences)
Polished fossilized wood (likely petrified wood)
Silicified wood; commonly quartz (SiO₂) replacing wood tissue
fossil
Dinosaur Claw Fossil
Fossilized Theropod Claw (Vertebrate Palaeontological Specimen)
fossil
Fulgurite
Lechatelierite (Silica Glass)
mineral
Fulgurite
Lechatelierite (Silica glass tube)
mineral
Fossilized Shark Tooth (Otodus obliquus)
Otodus obliquus (Mineralized Apatite / Bio-apatite)
fossil
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Jasper (likely Kambaba or Crocodile Jasper variety)
Silicon Dioxide (SiO2) with inclusions
sedimentary
Fossilized Oyster (Devil's Toenail)
Gryphaea (extinct genus of bivalve mollusks)
sedimentary
Petoskey Stone (Fossilized Coral)
Hexagonaria percarinata (CaCO3)
sedimentary
Fossilized Wood (Petrified Wood) and Associated Rocks
Silicified Wood / Xylopal
fossil
Chert (with Calcite layering)
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3)
sedimentary
Fossilized Shark Tooth (Fragment)
Elasmobranchii gen. et sp. indet.
fossil
Chert (Green Fossilized Algae or Jasper)
Silicon Dioxide (SiO2)
sedimentary
Mookaite Jasper
Mookaite (variety of Chert/Jasper), Silicon Dioxide - SiO2
sedimentary
Fossil Coral (Rugose)
Rugosa (Order), often preserved in Limestone (CaCO3)
sedimentary
Amber
Succiniferous fossil resin (C10H16O)
fossil
Shark Tooth Fossil
Otodus sp. (possibly Cretalamna)
fossil
Fulgurite
Fulgurite (Lechatelierite/Silica glass)
mineral
Dyed Coral
Calcium carbonate (CaCO3) - Calcite or Aragonite with dye
organic gemstone
Dendritic Quartz
Silicon Dioxide with inclusions (SiO2)
mineral
Bivalve Fossil (Clam)
Class Bivalvia (Calcium Carbonate, CaCO3)
sedimentary
Fossilized bone, likely a tooth or jaw fragment
Mineralized vertebrate bone; taxonomic identification requires clearer diagnostic anatomy
fossil
Fossil Shark Tooth
Odontaspididae (likely Carcharias sp.)
fossil
Petrified Wood
Fossilized Wood (SiO2 replacing organic matter)
fossil
Amber
Succinite (Resin C10H16O)
mineral
Crinoid Stem Fossil
Class Crinoidea (Phylum Echinodermata), often preserved in Limestone or Calcite (CaCO3)
sedimentary
Fossilized Crinoid Stem Columnal
Phylum Echinodermata; Class Crinoidea (CaCO3)
sedimentary