Fossilized Shark Tooth (Carcharocles/Otodus or Sand Tiger Shark Tooth)
Elasmobranchii (Fossilized Tooth)
fossil
Category
Mineral, Sediment
Browse mineral, sediment specimens identified by the Rock Identifier community.
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Hematite / Jasper
Iron(III) oxide (Fe2O3) in Quartz (SiO2)
mineral / sedimentary
Jasper
Silicon Dioxide (SiO2)
sedimentary/mineral
Yellow Ocherous Siltstone (Limonitic Shale)
Limonitic Siltstone / Goethite-rich Sedimentary Rock
sedimentary
Red Jasper
Silicon Dioxide (Microcrystalline Quartz), SiO2
mineral
Red Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
River Pebbles (Chert and Quartzite)
Sedimentary Clastic Rock (Silica-rich)
sedimentary
Banded Chert (River Siltstone)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Banded)
Microcrystalline Quartz (SiO2)
sedimentary
Greywacke
Lithic Sandstone (Greywacke - (SiO2+Al2O3+Fe2O3))
sedimentary
Fossiliferous Chert or Limestone
Sedimentary rock containing fossilized marine invertebrates (likely crinoid stems or bryozoans)
sedimentary
River Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Weathered basalt or mafic volcanic rock
Basalt; predominantly plagioclase feldspar, pyroxene, and commonly olivine or iron oxides
igneous
Petrified Wood
Petrified Wood (Silicified Wood)
fossil
Rounded brown pebble, likely chert or iron-stained quartzite
Chert (microcrystalline quartz, SiO₂) or quartzite (recrystallized quartz, SiO₂)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Quartz (Chert/Quartzite)
Silicon Dioxide (SiO2)
mineral
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Muscovite (Mica)
Muscovite - KAl2(AlSi3O10)(OH)2
mineral
Rhodonite
Rhodonite (Manganese Silicate), (Mn,Fe,Mg,Ca)SiO3
mineral
Rhodonite
Rhodonite (Mn, Fe, Mg, Ca)SiO3
mineral
Wild Horse Magnesite
Magnesite with Hematite inclusions (MgCO3)
mineral
Crinoid Stem Fossil (Stone)
Crinoid columnal (Class Crinoidea)
fossil
Quartz (Milky/Cloudy Variety)
Silicon Dioxide (SiO2)
mineral
Weathered iron-rich rock, possibly basalt or limonite-bearing sandstone
Undetermined; likely Fe-oxide-stained basalt or ferruginous sandstone (hematite/goethite-bearing)
igneous
Petrified Wood
Silicified Wood (SiO2)
fossil
Ironstone Concretion / Limonite-stained Siltstone
Ironstone (primarily Limonite FeO(OH)·nH2O and Siltstone)
sedimentary
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Greenschist
Chlorite schist
metamorphic
Fossilized Trilobite or Mollusk Fragment
Phylum Arthropoda / Mollusca fossil in sedimentary matrix
fossil
Jasper (specifically Red Jasper)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Common Gravel / Pebble
Lithified rock fragment / Detrital sediment
sedimentary
Ironstone Concretion (likely)
Goethite/Hematite/Limonite cemented sediment
Sedimentary Rock
Fossilized shell or brachiopod
Likely a calcareous brachiopod or bivalve fossil; exact identification requires clearer detail and scale
fossil
Fossilized Sand Dollar
Echinoidea (Clypeasteroida)
fossil
Fossil Sponge / Horn Coral / Crinoid Stem
Phylum Porifera or Cnidaria fossilized in calcium carbonate / silica
fossil
Bivalve Fossil (Brachiopod or Scallop)
Class Bivalvia (or potentially Phylum Brachiopoda)
fossil
Fossilized Shark Tooth
Carcharocles sp. or similar Lamniformes
fossil
Fossilized Sand Tiger Shark Tooth
Carcharias sp. (likely Carcharias taurus or Striatolamia)
fossil
Ironstone Concretion
Siderite or Limonite Concretion
sedimentary
Puddingstone
Conglomerate
sedimentary
Cone-in-cone structure (Limestone)
Cone-in-cone structure (Secondary Sedimentary Structure)
sedimentary