Limestone
Calcium Carbonate (CaCO3)
sedimentary
Category
Sedimentary (Fossil)
Browse sedimentary (fossil) specimens identified by the Rock Identifier community.
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Ironstone Concretion
Ironstone (Limonite/Goethite Concretion)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Ironstone Concretion
Siderite or Hematite Concretion (FeCO3 or Fe2O3)
sedimentary
Siltstone with Concretion
Siltstone (composed of hydraulic silicates and quartz particles)
sedimentary
Red Sandstone
Clastic Sedimentary Mineraloid (predominantly Quartz grains with Iron Oxide cement)
sedimentary
Limonite Concretion (Goonie or Rattlestone)
Limonite (FeO(OH)·nH2O)
sedimentary
Amber
Succinite (specifically for Baltic amber; fossilized tree resin)
Organic (Sedimentary-associated)
Limonite Concretion
Limonite (Hydrated Iron Oxide) FeO(OH)·nH2O
sedimentary
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Fossilized Shark Tooth (Fragment)
Elasmobranchii gen. et sp. indet. (Calcium Phosphate / Apatite fossil)
fossil
Weathered vuggy quartz-rich rock (probable silicified limestone or quartz breccia)
Microcrystalline quartz (SiO₂) with calcite (CaCO₃), iron oxides, and minor clay minerals
sedimentary
Sandstone
Sandstone (SiO2 dominant, with minor feldspar and clay minerals)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (River Pebble)
Silicon Dioxide (SiO2)
sedimentary
Chert Concretion (Flint)
Silicon Dioxide (SiO2)
sedimentary
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Concretionary Sandstone
Clastic Sedimentary Rock (Sandstone with secondary mineral cementation)
sedimentary
Ironstone concretion / Limonitic Sandstone
Goethite/Hematite Cemented Sandstone (Hydrated Iron Oxide)
sedimentary
Sandstone
Arenite (CaCO3/SiO2 cemented quartz)
sedimentary
Stromatolite
Biogenic Sedimentary Rock (composed predominantly of CaCO3)
sedimentary
Siltstone
Siltstone (fined-grained clastic sedimentary rock)
sedimentary
Cone-in-cone structure
Cone-in-cone structure
sedimentary
Fossilized Coral
Cnidaria (Anthozoa), often replaced by Calcium Carbonate (CaCO3) or Silica (SiO2)
sedimentary
Crinoid Stem Fossil in Limestone
Crinoidea (class) in Calcium Carbonate (CaCO3) matrix
fossil
Crinoid Stem Fossil
Crinoid ossicle (Phylum Echinodermata)
fossil
Horn Coral Fossil
Rugose coral (Order Rugosa)
fossil
Vesicular basalt (likely weathered scoria)
Basaltic volcanic rock; chiefly plagioclase, clinopyroxene, and olivine with vesicles
igneous
Orbicular granite (likely rapakivi-type granite)
Granite; chiefly quartz, alkali feldspar, plagioclase, and biotite/hornblende
igneous
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Limestone
Sedimentary carbonate rock (CaCO3)
sedimentary
Limestone
Calcareous Sedimentary Rock (CaCO3)
sedimentary
Banded Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Limestone with Calcite Veining
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Siltstone
Siltstone
sedimentary
Limestone (Concretionary or Tufa)
Calcium Carbonate (CaCO3)
sedimentary
Fossil Coral (Rugose Coral)
Rugosa (extinct order of solitary and colonial corals)
sedimentary
Petoskey Stone (Coral Fossil)
Hexagonaria percarinata (Fossilized colonial rugose coral)
sedimentary
Favosites (Honeycomb Coral Fossil)
Favosites sp. (Phylum Cnidaria, Order Tabulata)
sedimentary
Honeycomb Coral Fossil (Favosites)
Favosites alpenensis
sedimentary
Calamites Fossil (Horsetail Stem)
Calamites (Genus), part of the class Equisetopsida
sedimentary