Sedimentary (Biogenic Sediment Or Biological Remain)

Fossil tooth, likely mammalian molar or premolar

Mineralized fossilized tooth; exact taxon cannot be determined from the image

Likely limestone or calcareous fossil fragment

Calcite-rich carbonate rock; possibly bioclastic limestone (CaCO₃)

Fossilized bone fragment (probable large mammal limb bone)

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

Likely metamorphic schist

Mica schist, probably quartz–biotite schist

Banded Chert

Microcrystalline Quartz (SiO2)

Coquina / Fossiliferous Limestone

Fossiliferous Limestone / CaCO3

Likely flint/chert fragments

Microcrystalline quartz (SiO₂), possibly fossil-bearing chert

Chert (Yellow Jasper / Flint)

Microcrystalline Quartz (SiO2)

Fossilized bivalve shell

Recrystallized calcium-carbonate shell, commonly fossil oyster or clam (Bivalvia)

Chert (Jasper variation)

Microcrystalline Quartz (SiO2)

Shungite

Fullerene-bearing carbonaceous rock

Banded limestone or marble

Calcite-rich carbonate rock; likely veined limestone, possibly low-grade marble (CaCO₃)

Bivalve seashell (likely cockle or ark clam)

Calcareous shell composed chiefly of aragonite (CaCO₃); exact species cannot be determined confidently from the image

Rounded brown chert or jasper pebble

Microcrystalline quartz (SiO₂), likely ferruginous chert/jasper

Weathered limestone fragment

Limestone, predominantly calcite (CaCO₃), possibly porous bioclastic limestone

Abalone Shell (Nacre)

Aragonite (CaCO3) - Biogenic Mineral

Pearl necklace

Pearl (biogenic calcium carbonate, chiefly aragonite; CaCO₃)

Chert / Flint Pebble

Cryptocrystalline Quartz (SiO2)

Fossil scallop shell

Bivalvia, likely family Pectinidae; exact species cannot be determined from the image

Fossilized shell or coral fragment

Indeterminate marine invertebrate fossil; possibly a worn brachiopod, bivalve, or solitary coral

Raw mica-bearing metamorphic rock, likely schist

Mica schist; chiefly muscovite/biotite mica with quartz and feldspar

Fossilized Shell Fragment

Bivalvia or Gastropoda (depending on original organism)

Chert / Flint

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Brachiopod Fossil in Sedimentary Matrix

Phylum Brachiopoda in Siltstone/Mudstone matrix

Fossilized Brachiopod

Phylum Brachiopoda (replaced by Calcite/CaCO3)

Chert / Flint

Microcrystalline Quartz (SiO2)

Limestone with Chert

Calcium Carbonate (CaCO3) with Silica (SiO2) inclusions

Sea Bean (Hamburger Bean)

Mucuna sloanei

Fossiliferous limestone, possibly a weathered shell or bone fragment

Calcite (CaCO₃) fossil material in limestone; exact fossil identification is uncertain from the image

Amber

Succinite (approximate formula C10H16O)

Brachiopod Fossil

Phylum Brachiopoda (order potentially Spiriferida)

Fossilized mammalian tooth

Mineralized dental tissue, chiefly hydroxyapatite [Ca₅(PO₄)₃(OH)]

Fossiliferous Limestone / Fossil Fragment

Calcium Carbonate (CaCO3) with indeterminate biogenic remains

Chert / Jasper Pebble

Microcrystalline Quartz (SiO2)

Sand dollar fossil

Clypeasteroida (echinoid test), commonly Clypeasteroides spp.

Coquina

Biogenic Limestone (Coquina)

Coquina

Biogenic Limestone (Coquina)

Coquina

Biogenic Limestone (CaCO3)

Coquina / Shelly Limestone

Coquina (Biogenic Limestone)

Fossil bivalve shell

Likely an extinct or modern-like ribbed cockle/scallop; exact genus requires locality and diagnostic hinge features

Chert (Pebble)

Silicon Dioxide (SiO2)

Fossil shell fragment, likely bivalve or gastropod

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