Organic (Biological Specimen)

Shark Tooth Fossil

Vertebrate fossilized tooth (various genera such as Carcharodon, Otodus, or Negaprion)

Fossiliferous Limestone (Pink/Red)

Calcium Carbonate (CaCO3) with Bioclasts

Chert (Yellow Jasper variant)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Limpets Shell / Fossil Specimen

Patellogastropoda (Class)

Fossil bivalve shell

Likely an internal mold or mineralized shell of a brachiopod or small bivalve; exact taxonomy requires locality and diagnostic details

Fossilized Shark Tooth

Chondrichthyes (Class)

Optical Calcite

Calcite (Calcium Carbonate, CaCO3)

Limestone with Chert

Sedimentary Rock (CaCO3 with SiO2 inclusions)

Fossilized bone fragment (probable large mammal limb bone)

Mineral-replaced or permineralized bone; exact taxon cannot be determined from the image

Amber

Succinicum (Succinite); C10H16O

Amber

Succinite (with formula approximately C10H16O)

Brachiopod or Bivalve Fossil in Limestone

Phylum Brachiopoda or Bivalvia (embedded in Calcium Carbonate matrix)

Amber

Succinite

Red coral (likely precious coral)

Corallium sp.; calcium-carbonate skeleton, primarily calcite

Weathered fossil shell fragment

Indeterminate bioclastic carbonate, likely molluscan shell (calcium carbonate, commonly aragonite or calcite)

Vesicular volcanic rock, likely pumice or scoriaceous rhyolite

Silica-rich vesicular volcanic rock; commonly rhyolitic pumice (SiO₂-rich glass)

Fossil shell or shell fragment

Likely a calcareous bivalve or gastropod fragment; precise identification requires locality and microscopy

Aragonite (Onyx Marble)

Aragonite / Calcium Carbonate (CaCO3)

Blue Calcite

Calcite (Calcium Carbonate, CaCO3)

Fossilized Gastropod Shell

Class Gastropoda (Fossil)

Fossil shell fragment, likely bivalve or gastropod

Fossilized calcium-carbonate shell; likely aragonite/calcite replaced by calcite

Tahitian black pearl strand

Cultured pearl; aragonite (CaCO₃) nacre

Likely fossilized shell or bone fragment

Indeterminate bioclast; possibly silicified/bioapatite-bearing shell or bone

Amber

Succinite (fossilized tree resin)

Fossiliferous Limestone

Fossiliferous Calcilutite / Biomicrite

Chert / Flint Nodule

Silicon Dioxide (SiO2)

Fossiliferous limestone, possibly coral limestone

Calcite-rich carbonate rock; chiefly calcium carbonate (CaCO₃), with probable fossil coral or shell structures

Aragonite cluster

Aragonite, CaCO₃ (orthorhombic polymorph of calcite)

Pyrite

Iron Sulfide (FeS2)

Calcite

Calcium Carbonate (CaCO3)

Calcite

Calcium Carbonate (CaCO3)

Chert (Yellow Jasper)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Geode with Quartz and Chalcedony

Silicon Dioxide (SiO2)

Chert (Jasper/Carnelian variety)

Microcrystalline Quartz (SiO2)

Fossilized tooth or bone fragment

Indeterminate fossil; possibly a small fossil tooth or mineralized bone, exact identification requires microscopy

Fossil gastropod shell

Spiral marine gastropod fossil; likely a small ammonite-like or gastropod shell, exact taxon indeterminate

Aragonite (Yellow/Honey Tumble)

Calcium Carbonate (CaCO3)

Quartz with Pyrite and Lichen

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)

Fossiliferous limestone pebble

Calcite-rich limestone (primarily CaCO₃), with possible fossil or fossil-fragment patterns

Tooth or bone fragment (likely animal tooth)

Indeterminate vertebrate tooth; possibly a small mammal or fish tooth

Likely aragonite crystal cluster

Aragonite, CaCO₃

Tumbled fossil coral or carbonate fossil fragment

Likely fossilized coral, composed mainly of calcite (CaCO₃); exact identification is uncertain from the image