Organic Specimen (Fossil)

Limestone

Calcium Carbonate (CaCO3)

Ironstone Concretion (Siderite Nodules)

Siderite (FeCO3) in Mudstone or Sandstone matrix

Slate

Foliated Metamorphic Rock (primarily composed of quartz, illite, chlorite, and micas)

Sandstone (Ferruginous)

Arenite (with Iron Oxide cement)

Petrified Wood (Agatized/Silicified Wood)

Silicified Wood / Chalcedony (SiO2)

Coquina or Fossiliferous Limestone

Fossiliferous Calcarenite (CaCO3)

Sandstone

Arenite (primarily SiO2)

Red Shale

Lutite (primarily composed of clay minerals and iron oxides like hematite, Fe2O3)

Blue Agate (Tumbled and Dyed)

Silicon Dioxide (SiO2) with likely organic dyes

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)

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz, SiO2)

Fossilized Turritella Gastropod (Internal Mold)

Turritella (Fossil Gastropod Crust)

Limestone

Sedimentary Calcium Carbonate (CaCO3)

Sandstone

Arenite (often composed of Quartz, SiO2)

Dendritic Quartz Pebble

Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions

Fossilized Wood (with Coal and Limonite)

Petrified Wood (Silicified or Carbonized Flora)

Sandstone

Arenite (SiO2 predominantly)

Fossiliferous Limestone (Coquina / Shell Conglomerate)

Bioclastic Limestone (composed primarily of CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Desert Rose (Baryte or Selenite variant)

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

Sandstone

Arenite (SiO2 principal)

Belemnite Fossil

Belemnitida (Order of extinct cephalopods)

Trilobite Fossil (Flexicalymene)

Flexicalymene ouzregui

Sandstone (Quartz-rich)

Arenite (SiO2 based clastic rock)

Sandstone

Arenite (Sedimentary Rock)

Crushed Limestone

Sedimentary Calcium Carbonate (CaCO3)

Sandstone

Arenite (Siliclastic sedimentary rock, primarily SiO2)

Sandstone

Arenite

Limestone

Sedimentary Calcium Carbonate (CaCO3)

Petrified Wood

Silicified Wood (primarily SiO₂ - Silicon Dioxide)

Limestone

Calcium Carbonate (CaCO3)

Banded Agate (specifically Moss Agate or Plume Agate variety)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Sandstone

Arenite

Limestone with Weathering Rind

Calcium Carbonate (CaCO3) - Bioclastic or Micritic Limestone

Sandstone

Arenite (primarily SiO2)

Shale

Lutaceous sedimentary rock

Sandstone

Arenite (primarily SiO2)

Sandstone or Mudstone

Sedimentary Rock (Sandstone/Mudstone)

Petoskey Stone

Hexagonaria percarinata (Fossilized Rugose Coral)

Limestone

Calcium Carbonate (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Ironstone (likely Ferruginous Siltstone/Sandstone)

Ferruginous sedimentary rock (FeOx-rich clastic)