Sedimentary Rock (Cryptocrystalline Quartz)

Chrysoprase

Nickel-bearing Chalcedony (SiO2 with Ni impurities)

Glauconitic Sandstone (Greensand)

Glauconitic Quartz Arenite (containing Glauconite, (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)

Quartzite

Quartzite (primarily SiO2)

Gneiss

Gneiss

Gneiss (Metamorphic Rock)

Gneiss

Kambaba Jasper

Stromatolite (Fossilized Algae)

Milky Quartz

Silicon Dioxide (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Iron oxide inclusions

Ferruginous Sandstone (Gritstone)

Arenite with Iron-Oxide Cement (SiO2 with Fe2O3 and FeO(OH))

Quartz (likely a weathered/tumbled piece)

Quartz (SiO₂)

Epidote with Quartz/Feldspar

Epidote (Ca2(Al, Fe)3(SiO4)3(OH)) with associated minerals in a host rock

Gneiss

Gneiss (High-grade Metamorphic Rock)

Pink Opal (Common Opal)

Amorphous Hydrated Silica (SiO2·nH2O)

Sandstone (Red/Brown Variety)

Arenite (composed primarily of SiO2 with Fe2O3 iron oxide inclusions)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with iron oxide staining/cementing)

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Sandstone (Pebble)

Sandstone (arenite, arkose, wacke depending on composition)

Quartz (in matrix)

Quartz (SiO₂)

Jasper River Stone

Silicon Dioxide with Iron Oxide impurities (SiO2 + Fe2O3)

Gold-bearing Quartz with Iron Oxides

Quartz (SiO2) with Limonite/Goethite (FeO(OH)) and Pyrite (FeS2)

Red Sandstone (Iron-rich)

Ferruginous Sandstone (variable formula, primarily SiO2 + Fe2O3)

River Stone (likely Basalt or Chert)

Silicon Dioxide (SiO2) for chert or Mafic Extrusive Rock for basalt

Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Quartz Vein in Host Rock

Crystalline Silicon Dioxide (SiO2) in Pelitic or Shaly Matrix

Milky Quartz

Silicon Dioxide (SiO2)

Dalmatian Stone (commonly called Dalmatian Jasper)

Peralkaline Rock (mixed Feldspar, Quartz, and Arfvedsonite)

Shale

Fissile mudstone (Shale)

Gneiss

High-grade metamorphic rock (Gneiss)

Sandstone

Sandstone (lithified arenite/wacke)

Red Sandstone

Arenite (with Iron Oxide)

Jasper Agate (specifically Brecciated Jasper)

Silicon Dioxide (SiO2) with iron oxide and clay impurities

Quartz-Veined Mudstone

Argillite or Mudstone with Quartz Veining (SiO2 in Siliciclastic Matrix)

Sandstone Pebble (Quartzite-rich)

Clastic Terrigenous Sedimentary Rock (SiO2 dominant)

Sandstone (likely Fossiliferous)

Arenite / Sedimentum arenaceum

Smoky Quartz

SiO2 (Silicon Dioxide)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Ruby in Kyanite

Al2O3 (Corundum) in Al2SiO5 (Kyanite-Fuchsite-Quartz)

Gneiss

Gneiss (High-grade regional metamorphic rock)

Red Quartz (Carnelian/Red Jasper Agate)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Banded Iron Formation

Banded Iron Formation (BIF)

Chert (with Drusy Quartz Pocket)

Silicon Dioxide (SiO2)

Quartz Crystal (specifically a small Clear Quartz point)

Silicon Dioxide (SiO2)