Rock (Likely Sedimentary)

Blue Sea Glass

Amorphous Silica (Anthropogenic glass)

Halite

Halite (Sodium Chloride, NaCl)

Jasper with Hematite inclusions

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz-Veined Mudstone

Argillaceous Mudstone with Quartz Veining

Dendritic Jasper

Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Jasper with Quartz inclusions

Silicon Dioxide (SiO2)

Orbicular Rhyolite (Rainforest Jasper)

Rhyolite containing Spherulites (SiO2 with impurities)

Jasper

Jasper (Silicon Dioxide, SiO2)

Agate

Agate (Silicon Dioxide - SiO2)

Agate (Crazy Lace or Eye Agate)

Silicon Dioxide (SiO2)

Gneiss

Gneiss (High-grade metamorphic rock)

Chert (Septarian Nodules / Weathered Silex)

Microcrystalline Quartz (SiO2)

Sandstone

Arenite (SiO2 primarily)

Fossiliferous Limestone (Shell Fragment)

Biogenic Limestone (Calcium Carbonate / CaCO3)

Asphalt Concrete (Bituminous Conglomerate)

Anthropogenic Bituminous Conglomerate

Jasper and Quartz conglomerate (River Rock)

Silicon Dioxide (SiO2) - Chalcedony and Quartz variety

Fossil Coral

Scleractinia (Anthos), primarily Calcium Carbonate (CaCO3)

Red Sandstone

Arenite (Ferruginous Sandstone)

Quartz Druze on Matrix (Geode Fragment)

Quartz (Silicon Dioxide, SiO2)

Fossiliferous Limestone

Limestone (composed primarily of calcite with included fossils CaCO3)

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Chert (Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

General Rock and Mineral Collection (Center: Angelite / Blue Anhydrite)

Anhydrite (Calcium Sulfate, CaSO4)

Chert (includes Flint & Jasper)

Chert (Siliceous sedimentary rock, chemical formula SiO2)

Fossiliferous Shale Matrix

Clastic Sedimentary Rock with Brachiopod or Mollusk shell fragments

Quartz Geode in Chert/Limestone Matrix

Silicon Dioxide (SiO2) within Sedimentary Host Rock

Chert

Siliceous sedimentary rock (predominantly microcrystalline quartz, SiO2)

Travertine

Terrestrial Sedimentary Form of Calcium Carbonate (CaCO3)

Chert (Nodule)

Chert (composition: SiO2)

Ironstone Concretion (Moqui Marble)

Iron Oxide Concretion (Fe2O3 / FeO(OH) mixed with SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3)

Turquoise in Matrix

Hydrated phosphate of copper and aluminum (CuAl6(PO4)4(OH)8·4H2O)

Pyrite (on host rock)

Iron Sulfide (FeS2)

Gneiss (High-grade Metamorphic Rock)

Gneiss (Metamorphic silicate rock)

Red Sandstone

Arenite (with Iron Oxide)

Ammonite Fossil in Limestone Matrix

Ammonoidea (subclass) in Calcium Carbonate (CaCO3)

Chalk

Calcium Carbonate (CaCO3)

Quartz Crystal (specifically a small Clear Quartz point)

Silicon Dioxide (SiO2)

Chert (Cherty Flint/Jasper variety)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Limonite (Iron Ore)

Limonite; FeO(OH)·nH2O