Sedimentary Rock (Possibly Conglomerate Or Breccia With A Quartz Vein)

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert (Iron-Stained)

Microcrystalline Quartz (SiO2)

Chert (Nodular)

Chert (SiO2 - Microcrystalline Quartz)

Gneiss (Granitic Gneiss)

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

Basalt with Jasper Veining

Basaltic Rock with Cryptocrystalline Quartz (SiO2)

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Chert (White/Gray variety)

Chert (SiO2)

Quartz Geode (Cracked Open Fragment)

Silicon Dioxide (SiO2)

Vuggy Quartz on Matrix

Silicon Dioxide (SiO2)

Amethyst

Amethyst (Silicon Dioxide - SiO2 with impurities of iron)

Green Aventurine and Clear Quartz

Aventurine (variety of Quartz - SiO2) and Quartz (SiO2)

Sandstone

Arenite (primarily SiO2, silica)

Red Jasper

Silicon dioxide (microcrystalline quartz with iron oxide inclusions), SiO2

Jasper (Iron-stained Chert)

Silicon Dioxide (SiO2)

Sandstone (Ferruginous/Banded)

Clastic Terrigenous Sandstone (SiO2 with Fe2O3 cement)

Gneiss

Gneiss (High-grade metamorphic rock)

Green Jasper

Silicon Dioxide (SiO2) with iron silicate inclusions

Sandstone (Ferruginous)

Arenite (with Iron Oxides)

Sandstone with Iron Oxide (Limonite/Hematite)

Ferruginous Sandstone (SiO2 with FeO(OH)·nH2O)

Smoky Quartz

Silicon Dioxide (SiO2)

Pyrite in Matrix

Iron Sulfide (FeS2)

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Quartz Druzy (on Calcedony/Quartz base)

Silicon Dioxide (SiO2)

Jasper / Chert (River Pebble)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Yellow Quartz (Citrine Quartz Pebble)

Silicon Dioxide (SiO2)

Chert (Nodule)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Sandstone with Iron Staining

Clastic sedimentary rock (primarily SiO2 with Fe2O3)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Pink Opal

Hydrated Amorphous Silica (SiO2·nH2O)

Sandstone (with vugs or solution cavities)

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

Banded Chert

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Chert (White Chert/Flint)

Chert (Microcrystalline or Cryptocrystalline Quartz, SiO2)

Precious Opal

Hydrated silica (SiO2·nH2O)

Red Sandstone

Clastic sedimentary rock (primarily SiO2 with Fe2O3)

Sandstone

Arenite (Sedimentary rock comprising sand-sized grains)

Chert (Iron-stained)

Chert (SiO2)

Dalmatian Jasper

Dalmatian Stone (comprised of Feldspar, Quartz, and Arfvedsonite)

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Tumbled Carnelian and Quartz Mix

Silicon Dioxide (SiO2) with iron oxide impurities