Mineral Like Biological Tissue

Sea Snail Shell (Top Shell)

Trochidae family (Calcium Carbonate, CaCO3)

Polished fossil bone fragment

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

Fossil tooth, likely shark tooth

Likely fossilized shark tooth (possibly a small lamniform shark; exact taxon cannot be confirmed from the image)

Pyrite in Matrix

Iron Sulfide (FeS2)

Fossiliferous Sedimentary Rock

Sedimentary Rock with Invertebrate Fossil Imprint

Fossiliferous Limestone (Gritstone/Marl)

CaCO3 (Calcium Carbonate) with Fossil Inclusions

Fossilized Shell Impression / Siltstone Fossil

Bivalvia / Brachiopoda mold in Siltstone

Fossiliferous sandstone with plant fossils

Likely fossil-bearing siliciclastic sedimentary rock; apparent fragments may be fossil wood or leaf impressions, but species cannot be determined from the image

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Chert (Banded)

Chert (Microcrystalline Silicon Dioxide, SiO2)

Amber

Succinite (fossilized tree resin)

Olive Sea Shell Fossil

Oliva sp. (Calcium Carbonate, CaCO3)

Blue Apatite

Fluorapatite / Chlorapatite / Hydroxylapatite (Ca5(PO4)3(F,Cl,OH))

Fossiliferous Limestone (Pink/Red)

Calcium Carbonate (CaCO3) with Bioclasts

Chert (Siliceous Mudstone variant)

Microcrystalline quartz (SiO2)

Fossilized shell or bone fragment

Likely bioclast composed mainly of calcium carbonate (calcite/aragonite); exact organism is indeterminate from the image

Fossiliferous Limestone (containing Brachiopods)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Fossilized Shark Tooth or Bone Fragment

Vertebrate Fossil (likely Carcharodon or similar genus)

Petrified Wood

Silicified Wood (primarily SiO2)

Pearl

Aragonite / Calcium Carbonate (CaCO3)

Hag Stone

Perforated Flint or Chert (SiO2)

Fossilized shell or bone fragment

Indeterminate biogenic calcite or apatite fossil

Honeycomb Calcite

Calcite (Calcium Carbonate, CaCO3)

Moss-covered Limestone with Quartz/Calcite Pocket

Calcium Carbonate (CaCO3) rock with biological moss coating

Unknown Organic Object (likely a berry or fruit)

Not applicable; this is not a geological specimen. If it were a cranberry, its scientific name would be Vaccinium macrocarpon; if a cherry, it would be Prunus avium or Prunus cerasus.

Fossilized Brachiopod

Articulata (Class) / Brachiopoda (Phylum)

Fossilized coral or reef limestone

Calcite (CaCO₃), commonly fossil coral such as Scleractinia

Limestone (Flagstone)

Fossiliferous Limestone (CaCO3)

Limestone with Chert Nodule

Carbonate rock (CaCO3) with Microcrystalline Silicon Dioxide (SiO2) inclusion

Weathered fossiliferous limestone or fossil fragment

Indeterminate bioclastic carbonate rock; likely calcite (CaCO₃) with fossil shell material

Fossilized bivalve shell

Fossil mollusk, likely an oyster or similar cemented bivalve; original shell mostly calcite (CaCO₃)

Fossiliferous Limestone

Limestone (Calcium Carbonate, CaCO3)

Fossil Shark Tooth

Lamniform (Mackerel Shark) fossil tooth, likely Otodus or Cretalamna

Chert (Flint variety)

Chert (SiO2)

Banded Chert

Silicon Dioxide (SiO2)

Chert (and Fossiliferous Limestone)

Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)

Chert (Chalcedony-rich sedimentary rock)

Cryptocrystalline Quartz (SiO2)

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with Biogenic Fossils

Sandstone (Ferruginous)

Sandstone (SiO2 with iron oxide impurities)

Chert

Microcrystalline Quartz (SiO2)

Fossilized mammoth molar fragment

Proboscidean molar enamel and dentine, commonly Mammuthus spp.

Natural White Pearl

Calcium Carbonate (Aragonite/Calcite) with Conchiolin - CaCO3