Megalodon Shark Tooth Fossil
Otodus megalodon (fossilized in sedimentary matrix)
sedimentary
Category
Biogenic Material
Browse biogenic material specimens identified by the Rock Identifier community.
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Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Chert / Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Gypsum (Wallboard/Drywall)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
sedimentary
Chert Nodule
Chert (SiO2)
sedimentary
Geode (Unopened)
Vug or Geode (primarily Silicon Dioxide, SiO2)
sedimentary
Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Red Jasper
Quartz (Silicon Dioxide) with Hematite inclusions, SiO2
mineral
Chert (Jasper)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Fossil Shark Tooth
Carcharocles (Otodus) sp. or similar fossilized Chondrichthyes tooth
sedimentary
Bicolor Quartz Tumble
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Chert (containing Flint and Calcareous inclusions)
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3) impurities
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Cullet Glass (Slag Glass)
Amorphous Silicon Dioxide (Industrial Man-made)
mineraloid
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Iron-rich flint or chert fragment
Microcrystalline quartz (SiO₂), likely ferruginous chert
sedimentary
Concrete rubble
Anthropogenic conglomerate
sedimentary
Fossil gastropod shell
Fossilized marine gastropod; exact genus/species requires locality and examination
fossil
Blue-gray metamorphic rock, likely gneiss or schist
Quartz–feldspar–mica assemblage; exact identification requires testing
metamorphic
Fossilized bivalve shell in limestone
Calcitic fossil shell; likely an oyster or other rudist/bivalve (Bivalvia), preserved in carbonate rock
fossil
Polished red jasper (likely hematite-bearing jasper)
Jasper, microcrystalline quartz (SiO₂), colored chiefly by iron oxides such as hematite/goethite
mineral
Milky quartz with iron-oxide staining
Quartz, silicon dioxide (SiO₂), likely massive or coarsely crystalline; brown areas are limonite/goethite staining
mineral
Chalcedony (Chert/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Slag
Anthropogenic Vitreous Silica/Iron oxides
mineral-like byproduct
Pink Granite
Granite (Felsic Plutonic Rock)
igneous
Tumbled serpentine (likely)
Serpentine-group minerals, commonly lizardite or antigorite; approximate composition Mg₃Si₂O₅(OH)₄
mineral
Diamond (in jewelry setting)
Carbon (C)
mineral
Red jasper (likely tumbled)
Jasper, microcrystalline quartz/chalcedony (SiO₂), colored mainly by iron oxides
mineral
Polished labradorite cabochon
Labradorite, CaAl₂Si₂O₈–NaAlSi₃O₈ (feldspar solid solution)
mineral
Jasper
Microcrystalline Quartz (SiO2 with iron oxide impurities)
sedimentary
Green Jasper
Microcrystalline Quartz (SiO2) with mineral inclusions
sedimentary
Fossil Shark Tooth
Chondrichthyes (class)
fossil
Fossil Shark Tooth
Chondrichthyes (class)
fossil
Fossil Shell
Invertebrate fossil (Mollusca)
fossil
Chert (Flint pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Chalcedony in Matrix (likely Agatized Coral or Chert)
Silicon Dioxide (SiO2)
sedimentary
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary