Sedimentary (Chemically Precipitated Mineral)

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz with Fe2O3 staining)

Chalcedony (Botryoidal Agate vein)

Chalcedony (Microcrystalline Quartz) - SiO2

Quartz (Milky/Rose variety)

Silicon Dioxide (SiO2)

Sandstone (likely Graywacke or Arkosic varieties)

Arenite (composed primarily of SiO2)

Sandstone (likely Graywacke or Arkose variant)

Clastic Sedimentary Rock (SiO2 based)

Red Sandstone

Clastic sedimentary rock (primarily SiO2 with Fe2O3)

Sandstone

Arenite (composed primarily of SiO2)

Carnelian

Carnelian (SiO2 with Iron Oxide impurities)

Pyrite

Iron Disulfide (FeS2)

Quartz Veinated Sandstone or Siltstone

Silicon Dioxide (SiO2) within a clastic sedimentary matrix

Red Jasper

Silicon Dioxide with Iron Oxide (SiO2)

Selenite (Gypsum)

Hydrous calcium sulfate (CaSO4·2H2O)

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily SiO2)

Sandstone (Quartzite Pebble)

Arenite (primarily SiO2)

Sandstone (Quartzite-rich River Cobble)

Clastic sedimentary rock (primarily SiO2)

Sandstone (likely Fossiliferous Sandstone)

Clastic sedimentary rock (primarily SiO2)

Quartz (Chert/Chalcedony variety)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Sandstone (likely Arkosic)

Clastic Sedimentary Rock (Sandstone)

Sandstone with Iron Oxide

Arenite (SiO2 with Fe2O3 staining)

Brachiopod Fossil

Phylum Brachiopoda (likely Order Rhynchonellida or Spiriferida)

Sandstone with Foliose Lichen

Arenite (Rock matrix) with Xanthoparmelia or Flavoparmelia (Lichen genus)

Manganese Oxide Crust on Limestone

Manganese Oxides (e.g., Pyrolusite MnO2 or Romanechite) on CaCO3

Dalmatian Stone

Peralkaline rhyolite with arfvedsonite (formerly incorrectly called Dalmatian Jasper)

Rhodochrosite

Manganese carbonate (MnCO3)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Agatized Fossil (Druzy Agate)

Silicon Dioxide (SiO2) replacing organic matter

Quartzite

Quartzite (SiO2)

Soapstone mushroom decorative carving

Steatite (Hydrous magnesium silicate, Mg3Si4O10(OH)2)

Sandstone

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

Chert (Jasper variation)

Microcrystalline Quartz (SiO2)

Sandstone (specifically Picture Sandstone or Wonderstone)

Arenite (composed primarily of SiO2)

Quartz Crystal Fragment

Silicon Dioxide (SiO2)

Fossilized Shark Tooth (Otodus obliquus)

Otodus obliquus (Mineral composition: Bio-apatite/Calcium Phosphate replaced by various minerals)

Sandstone (with potential trace fossils)

Clastic sedimentary rock (primarily SiO2)

Druzy Quartz on Host Rock

Silicon Dioxide (SiO2)

Sandstone

Arenite (primarily SiO2)

Sandstone (likely Quartzose Sandstone)

Arenite (SiO2 based)

Banded Agate

Sedimentary Cryptocrystalline Quartz (SiO2)

Limonite (Ironstone)

Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)

Limonite (Iron Ore)

Limonite (Hydrous ferric oxides), generic formula FeO(OH)·nH2O

Sandstone (Quartzose Sandstone)

Clastic Sedimentary Rock - Arenite