Quartz

Quartz

Silicon dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Synthetic Blue Aura Quartz

Silicon Dioxide (SiO2) with Metallic Infusion

Milky Quartz

Silicon Dioxide (SiO2)

Quartz with Iron Staining

Silicon Dioxide (SiO2) with Hematite/Limonite inclusions

Mixed Mineral Collection (with Titanium Aura Quartz)

Silicon Dioxide (SiO2) with metallic coatings and various silicates

Orange Quartz (Ferruginous Quartz)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Milky quartz fragments

Quartz (silicon dioxide, SiO₂)

Quartz and Limestone Grouping

Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3)

Likely polished quartz or glass-like mineral cabochon

Probably quartz (SiO₂), though the image cannot exclude man-made glass

Smoky Quartz and Biotite Schist

Quartz-Biotite Schist (SiO2 + K(Mg,Fe)3AlSi3O10(F,OH)2)

Yellow Quartz (Polished)

Silicon Dioxide (SiO2) with iron inclusions

Milky Quartz with Schist Matrix

Silicon Dioxide (SiO2) with Mica Schist Matrix

Yellow Quartz (Citrine appearance)

Silicon Dioxide (SiO2)

Iron-stained quartz or quartz-rich rock

Quartz (SiO₂), possibly limonite/goethite-stained quartzite or breccia

Clear Quartz (Rock Crystal)

Quartz (SiO₂)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (likely a clear or rock crystal variety)

Quartz (SiO2 - Silicon Dioxide)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) in Rhyolitic Matrix

Quartz-rich granite or granitic pegmatite fragment

Granite; predominantly quartz (SiO₂), feldspar, and minor mica/iron oxides

Pegmatitic rose quartz with black tourmaline

Quartz (SiO₂) with schorl tourmaline (NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄), likely feldspar and mica

Quartz with Epidote / Chlorite Inclusions

Silicon Dioxide (SiO2) with Epidote Ca2(Al,Fe)3(SiO4)3(OH)

Amethyst stalactite slice pendant

Amethyst (紫 quartz), SiO₂, with concentric quartz/chalcedony and likely agate banding

Quartz-veined Metamorphic Pebble

Silicate-rich metamorphic rock with quartz veins (SiO2)

Quartzite with Epidote Vein

Metamorphosed Quartz Sandstone with Hydrothermal Vein

Gold-bearing Quartz with Iron Oxides

Quartz (SiO2) with Limonite/Goethite (FeO(OH)) and Pyrite (FeS2)

Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz

Crystalline Silicon Dioxide (SiO2)

Quartz Vein in Host Rock

Silicon dioxide (SiO2) veining in silicate matrix

Epidote with Quartz

Ca2(Al,Fe)3(SiO4)3(OH) (Epidote) / SiO2 (Quartz)

Milky Quartz in Epidote Host Rock

Crystalline Silicon Dioxide (SiO2) with Epidote Ca2(Al,Fe)3(SiO4)3(OH)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Green Aventurine

Quartz (SiO2) with fuchsite inclusions

Quartzite Pebble

Quartzite (primarily SiO2)

Quartzite

Quartzite (mainly SiO2)

Quartzite

Quartzite (SiO2)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within Metasedimentary or Igneous Matrix

Quartz-rich pegmatite fragment

Granite-family pegmatite; chiefly quartz (SiO₂), feldspar, and black mica (biotite)

Quartz

Silicon Dioxide (SiO2)

Quartz (Bull Quartz)

Silicon Dioxide (SiO2)

Milky quartz pendant

Quartz (silicon dioxide, SiO₂)