Fossilized Shark Tooth
Elasmobranchii (fossilized matrix/root section)
fossil
Category
Sedimentary (Fossilized Organic Remain)
Browse sedimentary (fossilized organic remain) specimens identified by the Rock Identifier community.
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Carbonaceous Chondrite (CV3 type)
Carbonaceous Chondrite (CV3 group)
meteorite
Fossiliferous Limestone (with Oyster Fossils)
Fossiliferous Calcarenite / Bivalve Mollusk Fossil
sedimentary
Fossiliferous Brachiopod in Shale
Brachiopoda (Phylum) preserved in Carbonaceous Shale
sedimentary
Fossilized coral or silicified organic limestone
Likely fossil coral (Scleractinia/Tabulata) replaced or cemented by calcite and silica; exact identification requires close examination
fossil
Muscovite mica
Muscovite, KAl₂(AlSi₃O₁₀)(OH)₂
mineral
Tiger's Eye (Oeil de Tigre)
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
metamorphic
Amber
Succinite (C10H16O)
mineral
Amber
Succinite (Formula: C10H16O)
Organic Mineraloid
Amber (Cherry or Red variety)
Succinite (with various trace amounts of organic compounds)
Organic Gemstone (not a rock)
Amber
Succinite (C10H16O)
mineral
Amber
Succinite (approximate formula C10H16O)
mineral
Native gold (gold nugget)
Native gold, Au; commonly alloyed with silver and copper (electrum when silver-rich)
mineral
Bivalve Fossil (Mussel or Clam Shell)
Bivalvia
fossil
Fossilized Shark Tooth
Chondrichthyes (Class) - likely Carcharodon or Otodus genus
fossil
Fossil mammalian skull
Fossilized vertebrate bone; exact taxon cannot be determined from the image
fossil
Fossiliferous limestone
Bioclastic limestone, predominantly calcite (CaCO₃)
sedimentary
Amber-set ring
Amber (fossilized plant resin; organic mineraloid), set in a metal ring
gemstone
Polished agate-like stone (uncertain; possibly a fossil or shell fragment)
Likely microcrystalline quartz (chalcedony), SiO₂; exact identification is limited by the image
mineral
Tumbled amber
Fossilized plant resin; commonly succinite (organic polymerized resin)
gemstone
Ironstone Concretion (Limonite/Goethite)
Ironstone (composed primarily of Goethite FeO(OH) and Limonite)
sedimentary
Granitic Sand
Detrital sediment (predominantly Quartz, Feldspar, and Mica)
sedimentary
Baltic Amber (Butterscotch or Egg Yolk Variety)
Succinite (C10H16O)
Organic Gemstone (Mineraloid)
Amber
Succinite (C10H16O)
mineraloid
Fossil Coral (Favosites Honeycomb)
Favosites (Genus), Phylum Cnidaria, Class Anthozoa
sedimentary
Fossil Coral
Scleractinia (Fossilized Coral) / Calcium Carbonate (CaCO3) or Silica (SiO2)
fossil
Megalodon Shark Tooth
Otodus megalodon
fossil
Amber
Succinate (Succinite for Baltic varieties)
Organic Mineraloid
Amber
Fossilized tree resin; chiefly organic terpenoid polymers (succinite)
gemstone
Fossilized ammonite fragment
Ammonoidea; likely an ammonite suture-section specimen, commonly Jurassic–Cretaceous
fossil
Cockle Shell Fossil
Cardiidae family (Bivalvia)
fossil
Petrified Wood
Silicified Wood (Permineralized Lycopsid, Conifer, or Hardwood)
fossil
Breccia
Clastic Breccia (SiO2/CaCO3 dominated)
sedimentary
Fossilized Shark Tooth (fragment)
Elasmobranchii (Class) fossil
fossil
Rounded river pebble, likely quartz-rich sandstone or weathered quartzite
Tentative: quartz arenite (sandstone) or quartzite; chiefly SiO₂
sedimentary
Shark Tooth Fossil
Carcharocles megalodon or similar fossilized shark tooth
fossil
Pearl
Calcium Carbonate (CaCO3) - Aragonite/Calcite organic gemstone
mineral
Amber
Succinite (a variety of fossilized tree resin); chemical formula appx. C10H16O
mineraloid
Tumbled amber
Fossilized plant resin; commonly succinite (C10H16O)
gemstone
Amber
Succinite
Organic Mineral
Amber
Succinite (formula varies, primarily C10H16O)
Mineraloid (Organic)
Fossil ammonite fragment
Ammonoidea; likely a partial planispiral ammonite shell, commonly preserved as calcite or replaced limestone
fossil