Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Category
Organic Specimen (Fossil)
Browse organic specimen (fossil) specimens identified by the Rock Identifier community.
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Hag Stone
Perforated Chert (Microcrystalline Silica, SiO2)
sedimentary
Gastropod Fossil (Snail Internal Cast)
Class Gastropoda (Steinkern)
sedimentary
Limestone
Calcium carbonate (CaCO3)
sedimentary
Sandstone (Ferruginous)
Arenite (SiO2 with iron oxide impurities)
sedimentary
Ironstone Concretion
Siderite or Hematite Concretion
sedimentary
Limestone
Calcium carbonate (CaCO3)
sedimentary
Horn Coral Fossil
Rugosa (Order Rugosa)
fossil
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Siltstone
Siltstone (SiO2, Fe2O3, Al2O3 mix)
sedimentary
Crushed Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite (Sedimentary rock composed of sand-sized grains, primarily SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Sandstone
Arenite (SiO2 based with mineral cement)
sedimentary
Fossilized Syringopora Coral (Organ Pipe Coral Fossil)
Syringopora sp. (Class Anthozoa, Order Tabulata)
fossil
Sand Dollar Fossil (Echinoidea)
Class Echinoidea (likely order Clypeasteroida), CaCO3 (Calcite)
sedimentary
Fossilized Shark Tooth
Elasmobranchii (Class) fossil
fossil
Amber (Copal)
Fossilized Tree Resin
mineraloid
Chert (Arrowhead or Projectile Point)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone
Sandstone (SiO2 with iron oxides and clay)
sedimentary
Vesicular Limestone with Borings
Fossiliferous Calcarenite (Calcium Carbonate, CaCO3)
sedimentary
Fossilized Knightia Fish
Knightia eocaena (set in fossiliferous Micritic Limestone)
sedimentary
Crushed Limestone
Calcium Carbonate (CaCO3)
sedimentary
Fossil Coral
Hexagonaria / Rugosa / Scleractinia
fossil
Crinoid Stem Fossil (St John's Bead)
Crinoidea (Class)
fossil
Pyrite
Iron Sulfide (FeS2)
mineral
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Bioclastic inclusions
sedimentary
Fossiliferous Limestone
Fossiliferous Limestone
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Septarian Nodule (Septarian Dragon Stone)
Septarian Concretion (Composition: Calcite, Aragonite, and Limestone/Clay)
sedimentary
Fossilized Favosites (Honeycomb Coral)
Favosites (extinct genus of tabulate coral)
sedimentary
Amber
(C10H16O)n – an amorphous organic substance, primarily composed of polymerized isoprenoids.
Mineral
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone (Quartz-rich)
Arenite (SiO2 based)
sedimentary
Chert (with Manganese Dendrites)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Sandstone (Weathered Pebble)
Arenite (SiO2 primarily)
sedimentary
Ironstone Concretion
Ironstone (Siderite/Limonite/Goethite)
sedimentary
Siltstone Pebble
Siltstone (composed of microscopic quartz and clay minerals)
sedimentary
Shale or Argillite
Shale (fine-grained clastic sedimentary rock) or Argillite (low-grade metamorphic rock derived from shale)
Sedimentary or Metamorphic (low grade)
Sandstone
Arenite (SiO2 based)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary