Sedimentary Rock (Cryptocrystalline Quartz)

Quartz

Quartz (SiO₂)

Geode (unopened)

Calcedony-lined Geode (SiO2)

Sandstone (Greywacke/Siltstone variant)

Clastic Sedimentary Rock (composed primarily of Quartz SiO2 and Feldspar)

Quartz

Silicon Dioxide (SiO₂)

Red Sandstone

Arenite (with Iron Oxide cement)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Red Jasper (with Quartz Veins)

Jasper (var. chert, SiO₂)

Gneiss

Gneiss

Siltstone with Quartz Vein

Siltstone (primarily SiO2, Al2O3, Fe2O3)

Red Sandstone

Arenite (Ferruginous Sandstone)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with iron oxide cement)

Sandstone (Micaceous)

Arenite (composed primarily of SiO2)

Quartz (Milky Quartz vein fragment)

Silicon Dioxide (SiO2)

Quartzite Pebble

Quartzite (SiO2)

Ferruginous Sandstone

Sandstone with Iron Oxide (Limonite/Goethite)

Gneiss (High-Grade Metamorphic Rock)

Gneiss (primarily composed of Quartz, Feldspar, and Mica/Amphiboles)

Red Sandstone

Arenite (predominantly Quartz with Hematite cementation)

Dalmatian Stone (Dalmation Jasper)

Aplite with Arfvedsonite inclusions

Quartz

Silicon Dioxide (SiO2)

Shale with Iron Oxide Staining

Fissile Mudstone (primarily clay minerals and quartz)

Sandstone with Magnetite and Iron Staining

Clastic Sedimentary Rock (contains Fe3O4 and Limonite/Hematite)

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone (specifically an Iron-Concretion)

Arenite with Iron Oxide (Limonite/Goethite) cementation

Sandstone

Clastic Sedimentary Rock (composed mostly of quartz and/or feldspar)

Geode with Quartz/Chalcedony

Silicon Dioxide (SiO2)

Granite Gneiss

Gneiss (High-grade metamorphic rock)

Sandstone (Ferruginous)

Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 staining)

Chrysoprase

Chalcedony (cryptocrystalline quartz) with nickel inclusions; SiO2

Jasper (Red Jasper with Quartz veins)

Jasper (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Jasper

Jasper (Silicon Dioxide, SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Sandstone Beach Pebble

Clastic Sandstone (SiO2 - Quartz-dominant)

Quartz-veined Metamorphic Rock

Quartz Vein in Phyllite or Schist (SiO2 in Silicate Matrix)

Quartz Druzy (on Calcedony/Quartz base)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Conglomerate

Clastic sedimentary rock (Polymictic Conglomerate)

Gneiss

Gneiss (High-grade metamorphic rock)

Dalmatian Stone

Dalmatian Jasper (a misnomer) / Perthitic Igneous Rock

Sandstone (with vugs or solution cavities)

Arenite (primarily Quartz and Feldspar with CaCO3 or SiO2 cement)