Sandstone
Arenite (primarily SiO2)
sedimentary
Category
Mineralized Fossil
Browse mineralized fossil specimens identified by the Rock Identifier community.
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Coal (Anthracite or Bituminous)
Carbon (C) with varying hydrocarbon and mineral impurities
sedimentary
Sandstone Pebble
Arenite (SiO2 based)
sedimentary
Sandstone (Quartzose)
Arenite
sedimentary
Fossilized Fish Skeleton in Matrix
Vertebrata (Class: Actinopterygii), typically found in limestone or shale matrices
sedimentary
Shale with Siltstone layering
Sedimentary Clastic Rock (Mudstone/Shale)
sedimentary
Ferruginous Sandstone
Sandstone with iron oxide (Hematite/Limonite) cement
sedimentary
Sandstone
Arenite (specifically Quartz Arenite)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossilized Rugose Coral
Order Rugosa
fossil
Otodus Shark Tooth
Otodus obliquus
fossil
Shale fragment
Shale (Laminated Mudstone)
sedimentary
Sandstone (River Stone)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (Weathered Pebble)
Arenite (SiO2 primarily)
sedimentary
Red Sandstone
Arenite (primarily SiO2 with Fe2O3)
sedimentary
Chert (with possible fossils)
Microcrystalline quartz (SiO2)
sedimentary
Petrified Wood
Silicified wood (primarily SiO2)
fossil
Amber
Succinite (Fossilized Tree Resin)
fossil
Sandstone Pebbles
Arenite (primarily SiO2 with mineral cement)
sedimentary
Shark Tooth Fossil
Elasmobranchii dentition (fossilized)
fossil
Sandstone
Arenite (primarily SiO2)
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement) SiO2
sedimentary
Limestone with Calcite Veins
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Porous Quartzite
Metamorphosed Quartz-rich Sandstone (SiO2)
metamorphic
Moqui Marble (Iron Oxide Concretion)
Iron Oxide Concretion (primarily Limonite/Hematite around a Sandstone center)
sedimentary
Ironstone Concretion (Boji Stone/Moqui Marble type)
Goethite/Hematite-encrusted Sandstone Concretion
sedimentary
Ferruginous Sandstone
Ferruginous Quartz-Arenite
sedimentary
Fossilized trilobite
Trilobita; likely an enrolled asaphid or phacopid trilobite
fossil
Fossil coral (likely solitary rugose coral)
Rugosa; possibly genus Heliophyllum or similar
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Fossiliferous Limestone
Biogenic Calcium Carbonate (CaCO3)
sedimentary
Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Fossiliferous Chert (with Brachiopod or Mollusk fragments)
Silicon dioxide (SiO2) with Calcium Carbonate (CaCO3) inclusions
sedimentary
Weathered gray sandstone or siltstone
Clastic siliciclastic rock, primarily quartz and feldspar grains cemented by silica or carbonate
sedimentary
Siltstone with Concretion
Siltstone (composed of hydraulic silicates and quartz particles)
sedimentary
Petrified Wood
Silicified Wood (primarily Chalcedony/Quartz, SiO2)
fossil
Fossiliferous Limestone
Sedimentary Limestone (CaCO3) containing Crinoid or Brachiopod remains
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified wood (SiO2)
fossil