Quartz

White Quartz Sphere

Silicon Dioxide (SiO2)

Rutile in Quartz (Rutilated Quartz)

SiO2 with TiO2 inclusions

Quartz-lined vesicle in basalt (amygdaloidal basalt)

Amygdaloidal basalt with drusy quartz; predominantly plagioclase, pyroxene, and iron oxides

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartz (Smoky/Milky)

Silicon Dioxide (SiO2)

Red Quartz (Tumbled)

Silicon Dioxide with Iron Oxide inclusions (SiO2)

Milky Quartz with Iron Inclusions

Crystalline Silicon Dioxide (SiO2)

Red agate-like polished stone (likely dyed chalcedony)

Chalcedony, microcrystalline SiO₂; possibly dyed quartz or glass imitation

Milky Quartz

Silicon Dioxide (SiO2)

Quartz-rich pegmatite (likely tourmaline-bearing)

Granitic pegmatite; primarily quartz (SiO₂), with feldspar and dark tourmaline/biotite

Quartz

Quartz (SiO₂)

Clear faceted gemstone in a gold-colored setting

Likely colorless quartz (rock crystal) or synthetic cubic zirconia; visual identification is inconclusive

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon dioxide (SiO2)

Quartz Crystal Fragment

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Cloudy Quartz (or Milky Quartz)

Silicon Dioxide (SiO2)

Fire Quartz (Hematoid Quartz)

Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)

Quartzite

Quartzite

Likely milky quartz fragment

Quartz (silicon dioxide, SiO₂), possibly with iron-oxide or mica inclusions

Quartzite

Quartzite (SiO2 dominant)

Aura Quartz (Coated Quartz)

Silicon Dioxide (SiO2) coated with vaporized metals

Smoky Quartz with Feldspar

SiO2 (Quartz) with KAlSi3O8 (Feldspar)

Pyrite in Quartz

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)

Quartz-veined Metamorphic Rock

Quartz Vein in Phyllite or Schist (SiO2 in Silicate Matrix)

Quartz Vein in Host Rock (Gneiss/Schist)

Silicon Dioxide (SiO2) within a metamorphic matrix

Milky Quartz / Quartz Geode Fragment

Silicon Dioxide (SiO2)

Mixed tumbled quartz specimens

Quartz, silicon dioxide (SiO₂), including rose quartz and milky/included varieties

Quartz-rich rock fragment, possibly chalcedony or weathered quartz

Silicon dioxide (SiO₂), likely quartz/chalcedony

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Likely smoky quartz

Quartz, SiO₂ (smoky variety)

Coarse-grained Quartz with Feldspar inclusions

Crystalline Quartz (SiO2) with Orthoclase/Plagioclase Feldspar inclusions

Quartz Vein in Metamorphic Rock

Quartz-veined Schist or Gneiss

Milky quartz

Quartz (SiO₂)

Iron-stained quartz-rich rock, possibly jasperized quartz or quartzite

Mostly SiO₂ quartz with iron oxides/hydroxides (hematite, goethite) and possible clay or feldspar impurities

Quartz-rich breccia or iron-stained quartzite

Silica-rich rock dominated by quartz (SiO₂), with minor iron oxides and possible feldspar

Quartz crystal with Pyrite inclusions

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)

Red Quartz / Iron-stained Quartz

Silicon Dioxide (SiO2) with Hematite inclusions