Sedimentary (Microcrystalline Quartz)

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (SiO2)

Blue Lace Agate (Tumbled)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Yellow Aventurine

Quartzite with Muscovite/Sericite inclusions (SiO2)

Sandstone (likely Quartzite-grade)

Arenite (primarily SiO2)

Quartzite with Hematite

Silica (SiO2) with Ferric Oxide (Fe2O3) inclusions

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

River Quartzite Pebble

Quartzite (SiO2)

Quartzite with Chlorite/Epidote

Metamorphosed Quartzite (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartzite Pebble

Quartzite (primarily SiO2)

Wishing Stone (Gneiss or Basalt with Quartz Vein)

Gneiss or Metabasalt (with a Quartz or Calcite intrusion)

Yellow Quartzite (Yellow Jasper)

Silicon Dioxide (SiO2)

Banded Agate (specifically Sardonyx)

Silicon Dioxide (SiO2) - variety of Chalcedony/Quartz

Quartz

Silicon Dioxide (SiO2)

Chrysoprase

Silicon dioxide with nickel impurities (SiO2 + Ni)

Ocean Jasper

Orbicular Jasper (Silicon Dioxide, SiO2)

Red Sandstone

Clastic Terrigenous Sedimentary Rock (typically Hematitic Quartz Arenite or Arkose)

Crushed Limestone and Calcite

Calcium Carbonate (CaCO3)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Milky and Bull Quartz)

Silicon Dioxide (SiO2)

Chert (Flint)

Microcrystalline silica (SiO2)

Ferruginous Quartz

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

Quartz Geode

Silicon Dioxide (SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Quartzite

Quartzite (primarily SiO2)

Druzy Agate (Star-cut Geode Slice)

Silicon Dioxide (SiO2) - Microcrystalline and Macrocrystalline Quartz

Quartzite Pebble

Quartzite (SiO2)

Sandstone (Ferruginous)

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

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Red Quartzite

Quartzite (SiO2 with iron oxide impurities)

Quartzite Pebble

Quartzite (primarily SiO2)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily Quartz with Hematite/Limonite oxides)

Quartzite

Quartzite (primarily SiO2)

Clear Quartz Crystal

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartzite (River Pebble)

Metamorphic Quartzite (SiO2)

Quartzite

Quartzite (primarily SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Sandstone (Greywacke/Lithic Sandstone)

Arenite (composed primarily of SiO2)