Sedimentary Rock (Cryptocrystalline Quartz)

Iron-stained Quartz

Silicon Dioxide (SiO2) with Hematite/Limonite impurities

Sandstone Beach Pebble

Clastic Sedimentary Rock (primarily Quartz with Iron Oxide coating)

Granite

Granite

Quartzite

Quartzite (primarily SiO2)

Milky Quartz (Quartz Vein)

Silicon Dioxide (SiO2)

Gneiss (specifically Micaceous Gneiss)

Gneiss (High-grade Regional Metamorphic Rock)

Red Sandstone

Arenite (primarily Quartz and Iron Oxide)

Chert (White-Tan variety)

Silicon dioxide (SiO2) / Microcrystalline Quartz

Quartz in Basalt (Xenocryst)

Silicon Dioxide (SiO2) in Mafic Igneous Volcanic Rock

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Grey River Stone (Quartz-rich Quartzite/Siltstone)

Quartzite / Meta-siltstone (primarily SiO2)

Quartz (Sunstone-like Chalcedony)

Silicon Dioxide (SiO2)

Banded Gneiss

Gneiss (High-grade metamorphic rock)

Quartz (Milky or Clear Quartz fragment)

Silicon Dioxide (SiO2)

Quartz Geode Fragment with Iron Staining

Silicon Dioxide (SiO2)

Banded Sandstone

Arenite (composed primarily of Quartz: SiO2)

Ferruginous Sandstone (River Pebble)

Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 cement)

Dalmatian Stone (often called Dalmatian Jasper)

Peralkaline Quartz-Feldspar Rock with Arfvedsonite (formerly believed to be Jasper)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Ferruginous Sandstone (Iron-rich Sandstone)

Ferruginous Arenite

Sandstone (Wonderstone)

Silicified Sandstone / Orthoquartzite with Liesegang rings

Greywacke with Quartz Veins

Lithic Sandstone (Greywacke) with SiO2 inclusions

Jasper with Quartz Veining

Silicon Dioxide (SiO2) with impurities

Quartzite Pebble (River Rock)

Quartzite (SiO2)

Pickled Dragon Eggs (Fictional Interpretation: Purple Agate or Amethyst Geodes)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Dyed Agate

Silicon Dioxide (SiO2) with synthetic dyes

Granitic Gneiss

Gneiss (containing Potassium Feldspar and Quartz)

Quartzite

Quartzite (primarily SiO2)

Quartz with inclusions (likely Chlorite or Hornblende) and country rock

SiO2 (Quartz) with associated ferromagnesian minerals

Gneiss (with Quartzite and Mica)

Gneiss

Ferruginous Quartz

Silicon Dioxide (SiO2) with Limonite/Hematite inclusions

Gneiss (with Quartz and Biotite Mica)

Gneiss

Red Sandstone

Arenite (primarily Quartz with Hematite cement)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Chert (variously known as Flint or Microcrystalline Quartz)

Silicon dioxide (SiO2)

Mica Schist

Mica Schist (Composition typically contains Muscovite: KAl2(AlSi3O10)(OH)2 or Biotite: K(Mg,Fe)3AlSi3O10(OH)2 along with Quartz and Feldspar)

Fossilized Favosites (Honeycomb Coral)

Favosites (Genus), Phylum Cnidaria, Class Anthozoa

Gold Ore (in Quartz/Sulfide matrix)

Native Gold (Au) in Quartz (SiO2) and Pyrite (FeS2)

Yellow Quartz or Citrine Geode/Cluster

Silicon Dioxide (SiO2)

Quartz pebble

Silicon Dioxide (SiO2)

Shale

Fissile mudrock (composed of clay-sized particles and detrital grains)

Sandstone (Red Sandstone)

Arenite (primarily Quartz with Hematite cement)