Mineralized Fossil

Mammoth Tooth

Mammuthus tooth fossil

Fossiliferous Brachiopod in Shale

Brachiopoda (Phylum) preserved in Carbonaceous Shale

Petoskey Stone (Petrified Favosites)

Favosites (extinct colonial coral), CaCO3 with Silica replacement

Polished fossil bone fragment

Fossilized bone, likely mammalian or reptilian; exact taxon cannot be determined from the image

Fossilized Echinoid Fragment (Calycinal/Boss Fossil)

Echinodermata fossil fragment

Weathered fossiliferous limestone

Calcitic limestone, predominantly calcium carbonate (CaCO₃), possibly containing shell or coral fossil fragments

Fossiliferous limestone

Calcitic limestone, primarily calcium carbonate (CaCO₃), with visible shell or coral fossils

Fossil Coral

Scleractinia (Fossilized Coral) / Calcium Carbonate (CaCO3) or Silica (SiO2)

Orbicular jasper (likely ocean jasper)

Siliceous microcrystalline quartz/chalcedony with iron-oxide and other mineral orbicules; composition varies

Orbicular jasper (polished jasper slab)

Orbicular jasper; microcrystalline quartz/chalcedony (SiO₂) with iron-oxide and other mineral inclusions

Fossiliferous limestone

Bioclastic limestone, primarily calcite (CaCO₃)

Turtle Stone / Septarian Nodule (Fragment)

Septarian Concretion (Calcite, Aragonite, and Limestone)

Vesicular volcanic scoria (likely basaltic scoria)

Scoria; predominantly vesicular basalt, composed mainly of plagioclase, pyroxene, and iron-rich glass

Blue-gray botryoidal mineral specimen

Likely botryoidal chalcedony or hemimorphite; species cannot be confirmed from the image alone

Fossil Shark Tooth

Chondrichthyes (class)

Polished fossiliferous limestone (likely coral-bearing)

Calcite-rich limestone, primarily CaCO₃; fossil identity is uncertain from the image

Ammonite Fossil

Ammonoidea

Fossil Coral

Scleractinia (Fossilized Hexacoral)

Fossilized Crab Carapace (Concretion)

Decapoda (fossil), typically preserved in calcite or siderite concretion

Fossil Shark Tooth

Chondrichthyes (Class)

Fossil Crab

Decapoda (likely Avitelmessus or Raninidae family)

Dinosaur Fossil Tooth

Vertebrate Fossilized Tooth

Fossil Shark Tooth

Selachii (fossilized dentition)

Siltstone with plant fossil impression

Sedimentary rock with Archaeopteris or Calamites flora impression

Sandstone with Manganese Dendrites

Arenite (mostly SiO2) with Manganese Oxide inclusions (MnO2)

Brachiopod Fossil

Rhynchonellida (Order)

Dinosaur Claw Fossil

Fossilized Theropod Claw (Vertebrate Palaeontological Specimen)

Quartz with iron-oxide staining

Quartz (SiO₂), with orange-brown iron-oxide/hydroxide coatings, likely limonite or goethite

Quartz-rich druse specimen

Quartz, silicon dioxide (SiO₂), likely with iron-oxide staining and minor feldspar or mica

Fossilized Brachiopod

Phylum Brachiopoda (replaced by Calcite/CaCO3)

Fossiliferous limestone slab

Bioclastic limestone, chiefly calcite (CaCO₃), with possible shell or coral fragments

Quartz-rich breccia or iron-stained quartz vein

Microcrystalline and crystalline quartz (SiO₂) with iron-oxide minerals, possibly limonite/goethite and sulfides

Fossiliferous limestone, likely coral or shell-rich fragment

Calcite (CaCO₃), commonly bioclastic limestone containing fossilized marine organisms

Fossil shell fragment in sedimentary rock

Indeterminate marine mollusk shell; likely a bivalve or gastropod fossil

Fossilized Shell

Invertebrate fossil (Bivalvia or Brachiopoda)

Fossiliferous Sedimentary Rock

Sedimentary Rock with Invertebrate Fossil Imprint

Fossil Bivalve / Ostreid Shell (Hag Stone / Perforated Pebble)

Phylum Mollusca, Class Bivalvia

Fossil Coral (Rugose Coral / Horn Coral fragment)

Rugosa (Tetracoralla) / Calcite (CaCO3)

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified wood (Quartz replacement, SiO2)

Tumbled Stone Collection (Fluorite, Sodalite, Moss Agate, Amethyst/Charoite, and Grey Agate)

Silica (SiO2) and Calcium Fluoride (CaF2) based minerals

Polished seam agate with druzy quartz and iron-oxide inclusions

Quartz (SiO₂), chiefly chalcedony with crystalline quartz and iron oxides/hydroxides