Rock (Likely Sedimentary)

Quartz (Double-Terminated)

Silicon Dioxide (SiO2)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide (Hematite/Limonite) inclusions

Chert (Chert Nodule with Cortex)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Red Sandstone

Arenite (Ferruginous Sandstone)

Sandstone with Quartz Vein

Arenite with Quartz (SiO2) Infilling

Jasper Conglomerate (Puddingstone)

Siliceous Conglomerate (Quartz and Jasper clasts in a fine-grained matrix)

Greywacke (River Siltstone)

Lithic Wacke (Sandstone subfamily)

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Red Swirl Beads (Likely Resin or Glass, simulating Red Jasper or Agate)

N/A (for the beads as pictured); Red Jasper: SiO2 (Chert variety); Red Agate: SiO2 (Chalcedony variety)

Moqui Marble (Iron Concretion)

Iron Oxide Concretion (Goethite/Hematite Cemented Sandstone)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with iron oxide staining/cementing)

Gneiss

Gneiss

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Mica Schist

Mica Schist (primarily Muscovite and Quartz)

Quartzite (clastic/metamorphic subtype)

Quartzite (primarily Silicon Dioxide, SiO2)

Fossiliferous Limestone (Coquina / Shell Limestone)

CaCO3 (Calcium Carbonate)

Clear Quartz

Silicon Dioxide (SiO2)

Gneiss

Gneiss (High-grade regional metamorphic rock)

Schist

Mica Schist (primarily Muscovite or Biotite sheet silicates)

Halite (Rock Salt)

Halite (NaCl)

Halite (Rock Salt)

Halite (Sodium Chloride, NaCl)

Jasper and Quartz River Cobble

Silicon Dioxide (SiO2) with Hematite inclusions

Sandstone

Arenite (primarily SiO2)

Crazy Lace Agate

Silicon Dioxide (SiO2) with iron and aluminum inclusions

Ventifact

Eolian Ventifact (often composed of basalt, chert, or quartzite)

Red Sandstone

Arenite (with Iron Oxide cement)

Clear Quartz crystals on a Matrix base (Geode fragment)

Silicon Dioxide (SiO2)

Gneiss (Metamorphic Rock)

Gneiss

Ferruginous Sandstone (Gritstone)

Clastic sedimentary rock with iron-rich cement (FeO(OH)·nH2O)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Chert (Common Opal/Chalcedony mixture)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Chert

Microcrystalline Quartz (SiO2)

Chert (Yellow Jasper/Flint)

Silicon Dioxide (SiO2)

Jasper River Stone

Silicon Dioxide with Iron Oxide impurities (SiO2 + Fe2O3)

Leopard Skin Jasper

Orbicular Rhyolite (Silicon Dioxide with various impurities)

Fossiliferous Limestone (Coquina / Shell Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Chert (Quartz Pebble)

Silicon Dioxide (SiO2)

Blue Agate (Dyed)

Silicon Dioxide (SiO2)

Quartz (Milky or Clear variety)

Silicon Dioxide (SiO2)

Ironstone Concretion / Limonite-stained Siltstone

Ironstone (primarily Limonite FeO(OH)·nH2O and Siltstone)