Fossilized Echinoid (Sea Urchin)
Echinoidea (Fossil)
sedimentary
Category
Mineralized Fossil
Browse mineralized fossil specimens identified by the Rock Identifier community.
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Pyrite
Iron Sulfide (FeS2)
mineral
Brachiopod Fossil in Limestone
Phylum Brachiopoda embedded in sedimentary rock
fossil
Fossiliferous Rock (Invertebrate Fossil in Matrix)
Fossiliferous limestone or shaly matrix containing skeletal fossil remains
fossil
Fossiliferous limestone
Bioclastic limestone, primarily calcite (CaCO₃)
sedimentary
Fossilized Bivalve Shell
Bivalvia (Phylum Mollusca)
fossil
Mammoth or Mastodon Tooth Fragment
Mammuthus / Mammut molar fragment
fossil
Fossil Brachiopod or Mollusk Cast
Phylum Brachiopoda / Mollusca internal mold
fossil
Fossil Snail
Gastropoda (fossilized)
fossil
Brachiopod Fossil
Phylum Brachiopoda (order potentially Spiriferida)
fossil
Bivalve Fossil (Internal Mold)
Bivalvia (Phalladomya or similar genus)
fossil
Mosasaur Tooth Fossil
Mosasauridae (likely Prognathodon or Plioplatecarpus)
fossil
Sandstone with Fossil Leaf Impression
Sedimentary rock (Sandstone/Siltstone matrix) with Carbonaceous film fossil
fossil
Fossilized Fish (Lepidotes)
Lepidotes sp. (Order: Lepisosteiformes)
sedimentary
Fossiliferous Sandstone / Quartzite Pebble
Sedimentary rock with skeletal fragments (e.g., Paleozoic crinoid/brachiopod fossils)
fossil
Fossil Bone Fragment
Petrified bone (permineralized hydroxyapatite)
fossil
Fossilized Echinoid (Sea Urchin) or Brachiopod
Echinoidea / Invertebrate Fossil
fossil
Banded Sedimentary Rock (Siltstone/Mudstone with concretion)
Siltstone with Ferruginous Banding
sedimentary
Echinoid Fossil (Commonly called a Sea Urchin or Heart Urchin)
Phylum Echinodermata, Class Echinoidea
sedimentary
Fossilized Dinosaur Skull (Tyrannosaurus rex)
Tyrannosaurus rex (permineralized fossil), rich in Hydroxylapatite/Silica
sedimentary
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Sandstone Pebble with Iron Staining
Clastic Sedimentary Rock (primarily Quartz with Fe2O3 oxides)
sedimentary
Fossil Shark Tooth
Odontaspididae (Sand Tiger Shark family)
fossil
Shark Tooth Fossil
Chondrichthyes (class) fossilized tooth
fossil
Pyrite cluster (iron pyrite)
Pyrite, FeS₂
mineral
Quartz-rich pegmatite or quartz vein rock
Mostly quartz (SiO₂), with probable feldspar and iron-oxide staining
igneous
Weathered limestone fragment
Calcitic limestone (mostly CaCO₃; possibly micritic limestone)
sedimentary
Weathered sandstone or iron-stained sedimentary rock
Quartz-rich sandstone, possibly ferruginous sandstone
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Bivalve Fossil (Clam)
Class Bivalvia (e.g., Exogyra or Gryphaea species)
fossil
Fossilized Bivalve in Limestone
Class Bivalvia within Sedimentary Matrix (likely CaCO3)
fossil
Fossiliferous Shale
Fossiliferous Mudstone / Shale
sedimentary
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Pyrite
Iron Disulfide (FeS2)
mineral
Fossil Coral
Rugose or Tabulate Coral Fossil (CaCO3 replacement)
fossil
Weathered fossiliferous limestone
Calcitic limestone, predominantly calcium carbonate (CaCO₃), possibly containing shell or coral fossil fragments
sedimentary
Fossiliferous Sandstone (with Brachiopod or Bivalve mold)
Clastic Sedimentary Rock with Macrofossil Mold
sedimentary
Vein-bearing sandstone or quartzite cobble
Quartz-rich sandstone with white quartz veins; possibly metamorphosed to quartzite
sedimentary
Pyrite
Iron Disulfide (FeS2)
mineral
Copper slag or vesicular basalt with copper minerals
Industrial slag / Basaltic matrix with secondary copper minerals
igneous
Blue-green copper mineral specimen, likely chrysocolla-bearing rock
Chrysocolla, hydrated copper phyllosilicate: approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O; possibly mixed with malachite or chrysocolla matrix
mineral
Fossiliferous Flint
Microcrystalline Quartz (SiO2) with Echinoid Fossil
sedimentary