Sedimentary (Fossil)

Petrified Palmwood

Palmoxylon (fossilized monocot xylem)

Chert (containing Fossil Inclusions)

Microcrystalline Quartz (SiO2)

Pyrite

Iron Disulfide (FeS2)

Pyrite

Iron Pyrite (FeS2)

Pyrite (Iron Pyrites)

Iron Sulfide (FeS2)

Sandstone Concretion

Limonitic Sandstone Concretion

Limestone (Fossiliferous)

Calcium Carbonate (CaCO3)

Shale (possibly Carbonaceous or Oil Shale)

Laminated Mudstone (primarily clay minerals and quartz)

Polished kambaba jasper

Orbicular stromatolitic jasper; microcrystalline quartz (SiO₂) with chlorite/amphibole-rich inclusions

Mixed polished river stones

Likely quartz, quartzite, chert/jasper, and possibly limestone or marble

Petrified Wood

Silicified Wood (SiO2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Shale

Shale (clay-sized silicate minerals)

Vuggy Chert / Silicified Limestone

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Chert Concretion

Microcrystalline Quartz (SiO2)

Ironstone Concretion

Ferruginous Sandstone / Siderite Concretion

Petrified Wood

Silicified wood (primarily Silicon Dioxide, SiO2)

Limestone

Calcium Carbonate (CaCO3)

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

Red Sandstone

Arenite (primarily SiO2 with hematite/iron oxide coating)

Coquina

Biogenic Limestone (Calcite/Aragonite base, CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Chert (Quartz Pebble)

Silicon Dioxide (SiO2)

Sandstone

Arenite (primarily SiO2)

Crinoid Stem Columns (Fossil)

Crinoidea (Class); often composed of the mineral Calcite (CaCO3)

Petrified Wood

Silicified Wood (primarily SiO2)

Fossil Coral

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

Concretion

Sedimentary Concretion

Geode / Fossilized Gastropod or Shell Cast

Silicon dioxide (Quartz) replacement / fossil mold

Sandstone (Quartzose Sandstone)

Arenite (primarily SiO2)

Honeycomb Coral Fossil

Favosites (extinct genus of tabulate coral)

Limestone with Fossil Fragment

Sedimentary carbonate rock (CaCO3)

Rounded river cobble, likely weathered sandstone or siltstone

Quartz-rich clastic sedimentary rock; exact identification requires a fresh surface and testing

Botryoidal Chalcedony (Quartz Var.)

Silicon Dioxide (SiO2)

Flesh-toned Siltstone

Siltstone (composed of microscopic Quartz and Feldspar grains)

Calcite-rich limestone

Limestone, primarily calcite (CaCO₃), possibly fossiliferous or dolomitic

Fossiliferous Limestone

Calcium Carbonate (CaCO3) - Limestone

Fossilized Coral (Honeycomb Coral)

Favosites (extinct genus of tabulate corals), CaCO3 (Calcium Carbonate)

Limestone Gravel

Sedimentary Calcium Carbonate (CaCO3)

Sandstone River Cobble

Arenite (SiO2 based)

Limestone (Beach Pebble)

Sedimentary Calcium Carbonate (CaCO3)

Limestone

Calcium Carbonate (CaCO3)