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

Quartz Geode

Crystalline Silicon Dioxide (SiO2) in Geode form

Greenschist with Quartz Veining

Greenschist (commonly containing Chlorite, Actinolite, and Epidote)

Druzy Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Jasper and Quartz River Cobble

Silicon Dioxide (SiO2) with Hematite inclusions

Sandstone

Arenite (primarily SiO2)

Quartz (specifically Milky or Clear Quartz)

Silicon Dioxide (SiO2)

Ferruginous Quartz (Iron-stained Quartz)

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Quartz (specifically Milky/Gray Quartz)

Silicon Dioxide (SiO2)

Jasper (Red/Brown Variety)

Jasper (Silicon Dioxide, SiO2 plus Iron Oxide impurities)

Sandstone (likely River-tumbled Picture Sandstone)

Arenite (predominantly SiO2 with iron oxide impurities)

Chert (Iron-stained)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Field Stone)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Sandstone with Tafoni Weathering

Arenite (SiO2 based)

Sandstone (River Cobble)

Arenite

Milky Quartz

Silicon Dioxide (SiO2)

Chert (Nodule)

Silicon Dioxide (SiO2)

Chert (Nodule / Geode fragment)

Microcrystalline Quartz (SiO2)

Quartz Mineral

Silicon Dioxide (SiO2)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Sandstone

Arenite (primarily SiO2 - Silicon Dioxide)

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide)

Sodalite (blue beads) and Clear Quartz (clear beads)

Sodalite: Na4Al3Si3O12Cl; Quartz: SiO2

Gneiss

Gneiss (high-grade metamorphic rock)

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with Fe2O3 cement)

Quartz (Milky/Crystalline variety)

Silicon Dioxide (SiO2)

Chert (Jasper/Flint variant)

Silicon Dioxide (SiO2)

Greywhacke (River Pebble)

Graywacke (immature sandstone)

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Sandstone

Arenite (primarily SiO2)

Gneiss (High-Grade Metamorphic Rock)

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

Sandstone (Quartzose type)

Arenite (primarily SiO2)

Sandstone

Arenite (SiO2 based)

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Crystalline Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Gneiss

Gneiss

Sandstone (with potential iron-oxide weathering)

Arenite (SiO2 based)