Mineral (Cryptocrystalline Quartz)

Clear Quartz (beads in a bracelet)

Quartz (SiO2)

Quartz Pebble (Iron-stained)

Silicon Dioxide (SiO2)

Quartz with Chlorite or Hornblende inclusions

Silicon dioxide (SiO2) with phyllosilicate or amphibole inclusions

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Flesh-colored or Rose Quartz variety)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz with Dendritic Inclusions

Silicon Dioxide (SiO2)

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Rose Quartz

Silicon Dioxide (SiO2)

Yellow Quartz (Citrine or Quartz Crystal with Iron Inclusions)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Smoky/Grey variety)

Silicon Dioxide (SiO2)

Quartz (Smoky/Milky Pebble)

Silicon Dioxide (SiO2)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Ferruginous Quartz (Hematoid Quartz)

Silicon Dioxide (SiO2) with Hematite or Goethite inclusions

Micro-crystalline Quartz Pebble (Chert)

Silicon dioxide (SiO2)

Quartz (Clear / Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Citrine or Smoky variant)

Silicon Dioxide (SiO2)

Shale or Argillite

Shale (sedimentary) / Argillite (metamorphic)

Milky Quartz/Clear Quartz Cluster

Silicon Dioxide (SiO2)

Citrine

Citrine (Silicon Dioxide, SiO2)

Quartzite

Quartzite (Primary mineral: Quartz, SiO2)

Quartz Geode/Cluster

Quartz (SiO2)

Gneiss

Gneiss

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz Crystal Point

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz

Quartz (SiO2, Silicon Dioxide)

Milky Quartz (Common Quartz)

Quartz (Silicon Dioxide, SiO2)

Quartz Vein in Sedimentary Matrix

Silicon Dioxide (SiO2) with host rock

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Agate Geode

Chalcedony (cryptocrystalline SiO2)

Jasper (Yellow/Brown variety)

Silicon Dioxide (SiO2) with iron oxide impurities

Milky Quartz (or Bull Quartz)

Silicon Dioxide (SiO2)

Dumortierite Quartz

Al7BO3(SiO4)3O3 (Borosilicate mineral/Quartz inclusion)

Quartz (likely)

Quartz (SiO2 - Silicon Dioxide)

Milky Quartz with Mica (Gneiss/Schist influence)

Silicon Dioxide (SiO2) with Phyllosilicates

Geode (Unopened)

Siliceous Geode (SiO2)

Chalcedony (or a variety of Chalcedony, likely Agate or Jasper)

Chalcedony (SiO₂)

Ferruginous Quartz

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

Sand (Construction Grade)

Unconsolidated siliciclastic sediment (primarily SiO2)