Organic Specimen (Fossil)

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz, SiO2)

Horn Coral Fossil

Rugose coral (Order Rugosa)

Fossilized Gryphaea (Devil's Toenail)

Gryphaea arcuata (Bivalvia: Gryphaeidae)

Sandstone

Arenite (SiO2 based)

Limestone

Calcium Carbonate (CaCO3)

Brown Quartz (Jasper or Chert)

Silicon Dioxide (SiO2)

Limestone

Sedimentary rock composed mainly of calcium carbonate (CaCO3)

Fossil Shark Tooth

Chondrichthyes dentition (Fossilized Tooth)

Ironstone Concretion

Siderite or Hematite-rich Concretion (FeCO3 / Fe2O3)

Sandstone

Arenite (composed primarily of SiO2)

Bivalve Fossil (Clam/Mollusk)

Class: Bivalvia (Order: Veneroida), Calcium Carbonate (CaCO3)

Sandstone (Pebble/Cobble)

Sandstone (arenite is a more precise term for sandstone with less than 15% matrix; this specimen appears to be a lithic or quartz arenite)

Fossil Shell

Invertebrate fossil (Mollusca)

Fossilized Bone (Petrified Bone)

Permineralized Bone Fossil

Limestone

Calcium Carbonate (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Limestone with Chert Nodule

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

Fossiliferous Limestone

Carbonate sedimentary rock (CaCO3)

Amber and Citrine Quartz

Succinite (Amber) and Silicon Dioxide (SiO2 / Citrine)

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Ferruginous Sandstone (Ironstone)

Ferruginous arenite

Limestone

Calcium Carbonate (CaCO3)

Petrified Wood (Agatized/Silicified Wood)

Silicified Wood (SiO2 - Silicon Dioxide)

Fossilized bivalve shell

Bivalvia (likely a venerid or similar clam); shell composed mainly of CaCO₃ as aragonite/calcite

Desert Rose (Baryte or Selenite variant)

Barium Sulfate (BaSO4) or Gypsum (CaSO4·2H2O) with Sand inclusions

Sandstone or Weathered Conglomerate

Sedimentary Rock (Quartzose Sandstone / Lithic Arenite)

Favosites Fossil (Honeycomb Coral)

Favosites (Extinct genus of tabulate coral)

Fossilized Brachiopod

Brachiopoda (Class Rhynchonellata or Spiriferida)

Fossilized Bone Fragment

Permineralized Skeletal Element (Likely Vertebrate)

Fossilized Tabulate Coral (Honeycomb Coral)

Favosites (Order: Tabulata)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Pyrite Sun (Pyrite Dollar)

Iron Disulfide (FeS2)

Limestone

Calcium Carbonate (CaCO3)

Shale

Argillaceous Sedimentary Rock

Sandstone

Arenite

Chert (Limonite-stained)

Microcrystalline Quartz (SiO2) with iron oxides

Chert (Nodule)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Limestone

Calcium Carbonate (CaCO3)

Shale

Lutaceous sedimentary rock

Sandstone (Calcareous or Quartz-rich)

Arenite

Coquina or Fossiliferous Limestone

Fossiliferous Calcarenite (CaCO3)

Sandstone (likely Graywacke or Arkose variant)

Clastic Sedimentary Rock (SiO2 dominated)