Sedimentary (Fossilized Organic Remains)

Sandstone Concretion

Sedimentary Concretion (SiO2 or CaCO3 cemented)

Coquina / Fossiliferous Limestone

Calcareous bioclastic sedimentary rock (CaCO3)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Banded Sandstone (Differential Weathering)

Clastic Sedimentary Rock (primarily SiO2)

Sandstone (Quartzite-rich)

Clastic Sedimentary Rock (primarily SiO2)

Chert

Microcrystalline Quartz (SiO2)

Quartz Geode Fragment

Silicon Dioxide (SiO2) in a Sedimentary Host

Limestone

Calcium Carbonate (CaCO3)

Sandstone (likely Quartzose)

Clastic sedimentary rock (SiO2 primary)

Sandstone (Pebble)

Clastic sedimentary rock (SiO2 primary)

Sandstone (Banded)

Clastic Sedimentary Rock (primarily SiO2)

Sandstone (with potential Quartzite characteristics)

Clastic sedimentary rock (primarily SiO2)

Sandstone

Arenite (primarily SiO2)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Chert (Field-collected Arrowhead-shaped Fragment)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Garnet Schist

Almandine Garnet in Mica Schist (Fe3Al2(SiO4)3)

Yellow Calcite

Calcium Carbonate (CaCO3)

Schist

Mica Schist (primarily Muscovite or Biotite sheet silicates)

Travertine

Terrestrial Sedimentary Rock (Calcium Carbonate, CaCO3)

Zebra Jasper

Silicon Dioxide (SiO2) - Macro-crystalline Quartz/Chert with impurities

Sandstone (with potential Arkose/Lithic characteristics)

Arenite (Sedimentary rock composed of sand-sized grains)

Breccia

Clastic Breccia (SiO2/CaCO3 dominated)

Chert Concretion (with typical hematite/limonite staining)

Sedimentary Concretion (SiO2 with FeO(OH)⋅nH2O)

Chert (Jasper)

Silicon Dioxide (SiO2)

Chert (varieties: Flint or Jasper)

Microcrystalline Quartz (SiO2)

Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Pyrite (FeS₂)

Sandstone

Arenite (SiO2 based with primary clasts 0.0625 to 2 mm)

Sandstone (clastic)

Clastic Sedimentary Rock (primarily composed of SiO2)

Sandstone

Sandstone (clastic sedimentary rock, predominantly SiO2)

Sandstone

Clastic Sedimentary Rock (primarily Quartz, SiO2)

Quartz Geode

Crystalline Silicon Dioxide (SiO2) in Geode form

Chert (Yellow Jasper)

Silicon Dioxide (SiO2)

Quartz Geode (Cracked)

Silicon Dioxide (SiO2)

Dyed Howlite (Dyed Red)

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

Quartz Geode (with Calcite influence)

Silicon Dioxide (SiO2) with possible Calcium Carbonate (CaCO3)

Yellow Calcite

Calcium Carbonate (CaCO3)

Chert (Jasper variety)

Microcrystalline Quartz (SiO2)

Optical Calcite (Iceland Spar)

Calcite (CaCO3)

Garnet (Almandine)

Almandine, Fe3Al2Si3O12

Limonite/Goethite (Iron Ore)

Hydrous ferric oxides (FeO(OH)·nH2O)

Specular Hematite with Quartz and Limonite

Hematite (Fe2O3) with Quartz (SiO2) and Limonite (FeO(OH)·nH2O)