Igneous And Fossil

Pyrite

Iron Disulfide (FeS2)

Pyrite

Iron Pyrite (FeS2)

Pyrite (Iron Pyrites)

Iron Sulfide (FeS2)

Fossiliferous limestone

Bioclastic limestone, chiefly calcite (CaCO₃)

Weathered fossil shell fragment

Likely a bivalve or gastropod shell, composed mainly of biogenic calcite/aragonite (CaCO₃)

Fossiliferous Limestone

Bioclastic Limestone

Polished fossiliferous limestone

Bioclastic limestone, commonly fossil-rich micrite or wackestone

Agate (or Operculum / Fossil Shell)

Silicon Dioxide (SiO2)

Fossil-bearing limestone, likely coral or shell limestone

Bioclastic calcarenite/calcirudite; predominantly calcium carbonate (CaCO₃), commonly calcite

Fossilized Gastropod in Limestone

Gastropoda (Class) in Fossiliferous Limestone

Polished fossiliferous limestone, likely crinoidal or coral limestone

Calcite (CaCO₃), fossiliferous carbonate rock

Horn Coral (Rugose Coral)

Order Rugosa (extinct)

Vesicular basalt (likely scoria)

Mafic volcanic rock; predominantly plagioclase, pyroxene, and volcanic glass, with possible olivine

Fossilized Coral

Cnidaria (Hexacorallia)

Fossil shell fragment

Indeterminate molluscan bioclast, likely aragonite or calcite

Polished fossil-bearing limestone

Fossiliferous micritic limestone, likely containing gastropod or ammonoid fragments

Fossilized Shark Tooth

Selachimorpha fossil

Fossilized Coral (Petrified Coral)

Anthozoa fossil

Fossilized Bone Fragment

Vertebrate Fossil

Shark Tooth Fossil

Selachii fossil

Starfish Fossil

Asteroidea fossil

Fossil Shark Tooth

Selachii fossil

Fossilized Echinoid (Sea Urchin)

Echinoidea (Fossil)

Orbicular/porphyritic stone, likely weathered igneous rock

Indeterminate; possibly orbicular granite or a weathered felsic porphyry

Fossiliferous Limestone with Rugose Coral

Calcium Carbonate (CaCO3) featuring Rugosa (extinct order of solitary and colony corals)

Vesicular basalt (likely weathered scoria)

Basalt; predominantly plagioclase, pyroxene, and commonly olivine, with abundant vesicles

Fossiliferous limestone

Bioclastic limestone, chiefly calcite (CaCO₃)

Weathered limestone or calcitic fossil/reef fragment

Calcite-rich limestone (CaCO₃), possibly fossiliferous limestone

Likely coral fragment or calcareous fossil

Aragonite/calcite (CaCO₃), possibly fossil coral such as Pocillopora or a bryozoan

Fossilized shell-bearing limestone

Bioclastic limestone, likely molluscan/coquina limestone (calcite, CaCO₃)

Fossilized coral (likely tabulate or colonial coral)

Fossil coral; possibly Hexagonaria or related Paleozoic colonial coral

Fossil coral

Colonial scleractinian coral fossil, likely a tabulate or honeycomb coral; exact genus requires microscopy

Fossilized bivalve or brachiopod fragment

Indeterminate fossil shell, likely calcitic or aragonitic carbonate

Fossil coral (likely colonial/tabulate coral)

Fossilized scleractinian or tabulate coral; calcium carbonate, chiefly CaCO₃ (calcite/aragonite replaced by calcite)

Tumbled fossiliferous limestone

Micritic limestone, likely bioclastic/fossiliferous carbonate rock (predominantly CaCO₃)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Mixed polished river stones

Likely quartz, quartzite, chert/jasper, and possibly limestone or marble

Fossiliferous Concretion

Septarian Concretion containing Brachiopods/Crinoids

Fossilized Bivalve Shell

Class Bivalvia (fossilized)

Fossilized Gastropod Internal Mold

Steinkern (Mollusca: Gastropoda)

Crinoid Stem Fossil in Chert

Crinoid columnal ossicles (phylum Echinodermata) embedded in microcrystalline quartz (chert)

Crinoid Stalk in Limestone

Crinoid fossil in Biomicrite (Limestone)