Limestone
Calcium Carbonate (CaCO3)
sedimentary
Category
Mineralized Fossil
Browse mineralized fossil specimens identified by the Rock Identifier community.
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Sandstone
Arenite
sedimentary
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Sandstone (Ferruginous)
Arenite (with Iron Oxides)
sedimentary
Lepidodendron Fossil (Scale Tree)
Lepidodendron sp.
fossil
Fossiliferous Limestone
Carbonate sedimentary rock (CaCO3) with bioclasts
sedimentary
Sandstone
Arenite
sedimentary
Weathered fossiliferous limestone or fossil fragment
Indeterminate bioclastic carbonate rock; likely calcite (CaCO₃) with fossil shell material
fossil
Chert Pebble (with fossil shell fragment)
Microcrystalline Quartz (SiO2) with Calcified Invertebrate Impression
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (Quartz-rich)
Arenite (Quartz Arenite)
sedimentary
Shale
Shale (Sedimentary rock composed of mud/clay minerals)
sedimentary
Amber / Copal
Succinite (fossilized tree resin)
mineraloid
Weathered limestone slab
Micritic limestone, primarily calcite (CaCO₃)
sedimentary
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Sandstone (River Stone)
Arenite (primarily SiO2)
sedimentary
Limestone
Sedimentary rock composed of Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Sandstone (with Lichen)
Arenite (primarily SiO2)
sedimentary
Amber
Fossilized Tree Resin (Succinite for Baltic varieties)
fossil
Petrified Wood
Silicified Wood (Permineralized Lycopsid, Conifer, or Hardwood)
fossil
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, SiO2)
fossil
Fossilized Shark Tooth (Anterior/Lateral)
Otodus megalodon or Carcharodon carcharias (fossilized)
fossil
Weathered limestone
Calcite-rich limestone (CaCO₃), possibly fossiliferous or dolomitic
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Ironstone Nodule
Ferruginous Siltstone/Sandstone
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone Concretion
Arenaceous concretion (primarily SiO2 with Fe2O3 staining)
sedimentary
Sandstone
Arenite
sedimentary
Ironstone Concretion
Siderite or Ferruginous Concretion (FeCO3 or Iron Oxides)
sedimentary
Fossilized Mammoth Tooth Fragment
Mammuthus primigenius (or Mammuthus sp.)
fossil
Petoskey Stone
Hexagonaria percarinata
fossil
Sandstone (likely Graywacke or Arkose variant)
Clastic Sedimentary Rock (SiO2 with assorted lithic fragments)
sedimentary
Sandstone Concretion
Ferruginous Sandstone Concretion (Primarily SiO2 with Iron Oxide cement)
sedimentary
Kambaba Jasper (Crocodile Jasper)
Stromatolite Fossil (Silicified Stromatolite / Quartz with Microfossils)
fossil
Amber
Succinite (Resinite)
Organic Crystal (Mineraloid)
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Sandstone
Arenite
sedimentary
Conical fossil shell or shell fragment
Likely a gastropod shell fragment; exact taxon indeterminate from the image
fossil
Fossil Coral and Quartz Pebble
Fossilized Anthozoa / Silicon Dioxide (Quartz)
sedimentary