Sedimentary Rock (Altered)

Chert (specifically Jasper/Brown Chert)

Silicon Dioxide (SiO2)

Kambaba Jasper (Crocodile Jasper)

Stromatolitic Rhyolite/Jasper (SiO2)

Picture Jasper

Silicon dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Chert (Flint Nobule)

Silicon Dioxide (SiO2)

Herkimer Diamond (Quartz)

Silicon Dioxide (SiO2)

Agate (Carnelian / Chalcedony)

Silicon Dioxide (SiO2)

Chert (Jasper and Chalcedony)

Silicon Dioxide (SiO2)

Black Jasper (Black Onyx substitute)

Silicon Dioxide (SiO2) with carbonaceous impurities

Quartz Druzy Geode Fragment

Silicon Dioxide (SiO2)

Chert Pebble/Nodule

Chert (a microcrystalline or cryptocrystalline sedimentary form of quartz, SiO2)

Quartz Druze on Matrix

Silicon Dioxide (SiO2)

Magnetite

Magnetite (Fe3O4)

Carnelian Agate

Silicon Dioxide (SiO2) - variety of Chalcedony

Blue Kyanite

Kyanite (Al2SiO5)

Jasper

Silicon Dioxide (SiO2)

Red Jasper

Jasper (Silicon Dioxide, SiO2 with Iron Oxide impurities)

Quartz Druse (on Chalcedony/Agate base)

Silicon Dioxide (SiO2)

Chert (Yellow Jasper variant)

Silicon Dioxide (SiO2)

Sandstone Pebble with Iron Staining

Clastic Sedimentary Rock (primarily Quartz with Fe2O3 oxides)

Geode with Quartz and Chalcedony

Silicon Dioxide (SiO2)

Chert

Chert (Microcrystalline Silica, SiO2)

Fossiliferous Chert (with Brachiopod or Mollusk fragments)

Silicon dioxide (SiO2) with Calcium Carbonate (CaCO3) inclusions

Turquoise

CuAl6(PO4)4(OH)8·4H2O

Quartz Mica Schist

Mica-Quartz Schist (Chemical: SiO2 + KAl2(AlSi3O10)(OH)2)

Hag Stone

Porous sedimentary rock (typically Flint, Chert, or Sandstone) with naturally occurring holes

Garnet (Almandine)

Almandine, Fe3Al2(SiO4)3

Sandstone (likely Quartzose Sandstone pebble)

Arenite (primarily SiO2)

Sandstone

Arenite (primarily SiO2)

Sandstone (Grooved/Weathered)

Arenite (composed primarily of Quartz and Lithic fragments)

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide impurities

Sandstone (with Iron Staining)

Clastic sedimentary rock (High Silica / Iron Oxide)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Red Sandstone

Clastic sedimentary rock (primarily Quartz and Feldspar with Iron Oxide cement)

Gneiss

Gneiss (High-grade Metamorphic Rock)

Epidote in Quartz (Unakite-like specimen)

Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH)) in Quartz (SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone with Iron Concretion

Arenite with Limonite/Goethite Concretion

Sandstone (Yellow/Tan Sandstone)

Arenite (primarily Quartz, SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Limestone (specifically Fossiliferous or Crinoidal Limestone)

Calcium Carbonate (CaCO3) - Calcite Rock

River Cobble (Quartzite-rich Sandstone)

Clastic Sedimentary Rock (Litharenite/Quartzite transition)