Sedimentary Rock (Specifically A Clastic Sedimentary Rock Formed Into A Cobble)

Conglomerate

Clastic Conglomerate (Lithic-rich)

Chalcedony

Silicon dioxide (SiO2) - Cryptocrystalline Quartz

Red Jasper

Argillaceous microcrystalline quartz (SiO2 with Fe2O3 inclusions)

Chert (Brecciated or Veined)

Silicon Dioxide (SiO2)

Agate (specifically Chalcedony/Banded Agate)

Silicon Dioxide (SiO2)

Boulder Opal

Precious Opal in Ironstone (Amorphous Hydrated Silica, SiO2·nH2O)

Sandstone (Ferruginous)

Arenite (Fe2O3 rich)

Mammoth Tooth Fragment

Mammuthus primigenius (fossilized dentin and enamel)

Diorite (Salt and Pepper Rock)

Diorite

Quartzite with inclusions

Quartzite (primarily SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Banded Chert (Flint)

Cryptocrystalline Quartz (SiO2)

Yellow Jasper

Jasper (Silicon Dioxide, SiO2)

Jasper (Red/Brown Variety)

Jasper (Silicon Dioxide, SiO2 plus Iron Oxide impurities)

Blue Chalcedony

Microcrystalline Quartz (SiO2)

Chert

Chert (SiO2)

Clear Quartz (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

Chert (and Limestone)

Chert (consisting of Microcrystalline Quartz, SiO2)

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide)

Blue Chalcedony

Silicon Dioxide (SiO2)

Garnet-Mica Schist

Garnetiferous Porphyroblastic Schist

Amethyst Geode

Silicon Dioxide with trace inclusions of Iron (SiO2)

Blue Calcite

Calcium Carbonate (CaCO3)

Jasper and Quartzite Pebble

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Carnelian (a variety of Chalcedony)

Cryptocrystalline Quartz (SiO2) with iron oxide inclusions

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Travertine (Tufa)

Chemical Sedimentary Limestone (CaCO3)

Mica Schist

Mica Schist (predominantly Muscovite or Biotite sheet silicates)

Chert (Nodular)

Chert (Microcrystalline Quartz, SiO2)

Petoskey Stone (Petrified Favosites)

Favosites (extinct colonial coral), CaCO3 with Silica replacement

Chert (River Pebble)

Microcrystalline silicon dioxide (SiO2)

Turquoise

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

Clear Quartz crystals on a Matrix base (Geode fragment)

Silicon Dioxide (SiO2)

Oolite (Ooids)

Oolitic Limestone (Principal mineral: Calcite, CaCO3)

Chert (Flint)

Silicon Dioxide (SiO2)

Bumblebee Jasper

Fossiliferous Calcite containing Orpiment and Realgar

Jasper with Agate Inclusions

Silicon Dioxide (SiO2) - variety of Quartz/Chert

Banded Agate (specifically Lake Superior Agate)

Silicon dioxide (SiO2) - Cryptocrystalline Chalcedony

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement

Turquoise

Turquoise - CuAl6(PO4)4(OH)8·4H2O

Coquina

Coquina (Bioclastic Calcarenite)