Mineralized Fossil

Fossil Shark Tooth

Chondrichthyes (Class)

Polished fossiliferous limestone (likely orbicular/fossil limestone)

Fossiliferous micritic limestone, composed primarily of calcite (CaCO₃)

Fossiliferous Limestone

Calcium carbonate matrix with macrofossils (CaCO3)

Shark Tooth Fossil

Chondrichthyes (class) fossilized tooth

Quartz-rich hydrothermal specimen, likely milky quartz with calcite

Quartz (SiO₂), with probable calcite (CaCO₃) and iron-oxide staining

Gossan

Ferruginous gossan (Iron-rich capping)

Gossan (Iron Cap)

Limonitic Gossan (Fe2O3·nH2O mixed)

Fossil bivalve shell fragment

Likely a ribbed oyster or scallop-type bivalve; exact genus requires locality and preservation details

Fossilized Shark Tooth

Elasmobranchii (fossilized matrix/root section)

Echinoid Fossil (Commonly called a Sea Urchin or Heart Urchin)

Phylum Echinodermata, Class Echinoidea

Fossil fish slab

Fossilized fish remains, likely a laminated shale-hosted vertebrate fossil; exact taxon is indeterminate from the image

Sea Urchin Fossil

Echinoidea (test/fossil)

Pyrite

Iron Sulfide (FeS2)

Snowflake obsidian

Volcanic glass (mostly silica-rich obsidian) with cristobalite spherulites

Fossiliferous limestone

Bioclastic carbonate rock, predominantly calcite (CaCO₃)

Fossiliferous limestone

Bioclastic limestone, composed mainly of calcite (CaCO₃) and fossil fragments

Granitoid (Granite/Gneiss mix)

Phaneritic Felsic Igneous Rock

Polished fossiliferous agate (likely fossil coral or shell in silica)

Silicified fossil in chalcedony, a microcrystalline form of quartz (SiO₂); exact fossil type is uncertain from the image

Iron-stained quartz-bearing rock

Quartz (SiO₂), likely with limonite/goethite iron oxides and possibly feldspar

Green faceted gemstone, likely emerald or synthetic emerald

Beryl, Be₃Al₂Si₆O₁₈, colored green by chromium and/or vanadium; identity cannot be confirmed visually

Brecciated quartz vein rock

Quartz (SiO₂), with iron-oxide staining and likely feldspar/carbonate gangue

Fossiliferous limestone

Bioclastic carbonate rock, primarily calcite (CaCO₃)

Fossiliferous limestone with a possible shell or trace fossil

Calcitic limestone (mostly CaCO₃), fossil identity indeterminate from the image

Fossiliferous Sandstone Pebble (with Crinoid / Shell Impression)

Sandstone containing fossiliferous inclusions (SiO2 matrix with calcite/silica cast fossil)

Fossiliferous limestone, likely with a coral or stromatoporoid fossil

Calcite (CaCO₃) limestone containing fossilized marine skeletal material

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Pyrite

Iron Disulfide (FeS2)

Fossilized Shark Tooth

Chondrichthyes tooth

Fossiliferous limestone with silicified fossil material

Bioclastic limestone; likely marine mollusk/coral fragments, locally replaced by chalcedony or calcite

Bivalve Fossil (Clam)

Class Bivalvia (e.g., Exogyra or Gryphaea species)

Fossil Shark Tooth

Chondrichthyes (Class)

Fossilized wood or bone fragment

Indeterminate permineralized organic fossil; possibly silicified wood or fossil bone

Fossil Bone Fragment

Petrified bone (permineralized hydroxyapatite)

Fossil Snail

Gastropoda (fossilized)

Banded Sedimentary Rock (Siltstone/Mudstone with concretion)

Siltstone with Ferruginous Banding

Fossilized Bone (Petrified Bone)

Permineralized Bone Fossil

Fossil Shark Tooth

Odontaspididae (Sand Tiger Shark family)

Petoskey Stone (Fossilized Coral)

Hexagonaria percarinata

Fossiliferous Shale

Fossiliferous Mudstone / Shale

Fossiliferous limestone

Bioclastic limestone, primarily calcite (CaCO₃)

Likely fossiliferous limestone fragment

Calcitic limestone, chiefly calcium carbonate (CaCO₃; mineral calcite)

Fossiliferous Flint

Microcrystalline Quartz (SiO2) with Echinoid Fossil