Quartz

Weathered quartz-rich rock, possibly granite or quartzite

Indeterminate quartz–feldspar aggregate; likely weathered granite (quartz, feldspar, minor iron oxides)

Pyrite on Quartz matrix

Iron Disulfide (FeS2) on Silicon Dioxide (SiO2)

Rutilated Quartz

SiO2 with TiO2 inclusions (Quartz with Rutile)

Faceted brown gemstone ring, likely smoky quartz

Quartz (SiO₂); identification from the image is uncertain

Quartz Vein in Schist / Gneiss

Silicon Dioxide (SiO2) in Metamorphic Matrix

Quartz geode (likely amethyst-bearing geode)

Microcrystalline quartz and drusy quartz; SiO₂, with possible iron-stained or amethyst quartz

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Milky Quartz

Silicon Dioxide (SiO2)

White Quartz (Milky Quartz Mushroom)

Silicon Dioxide (SiO2)

Quartz-rich rock, likely milky quartz

Quartz (SiO₂), possibly a massive quartz aggregate

Quartzite

Quartzite (chiefly SiO2)

Gold-bearing quartz vein fragment (probable placer gold specimen)

Quartz (SiO₂) with probable native gold (Au) and iron-oxide staining

Weathered, iron-stained quartz-rich rock

Likely quartzite or massive quartz (SiO₂), possibly with limonite/goethite staining

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within a metamorphic matrix

Rose Quartz

Silicon Dioxide (SiO2) with trace elements of Titanium, Iron, or Manganese

Weathered quartz-rich metamorphic rock (probable gneiss or quartzite)

Biotite–quartz–feldspar gneiss, possibly micaceous quartzite

Weathered quartz-rich rock, possibly iron-stained quartz or quartzite

Quartz (SiO₂), likely in a quartzite or quartz-vein matrix with iron oxides

Quartz-bearing granite or granitic pegmatite

Crystalline quartz (SiO₂) with feldspar and dark mica/amphibole; likely weathered granite

Hematoid Quartz (Fire Quartz)

Silicon Dioxide with Iron Oxide (SiO2 with Fe2O3)

Quartzite or Quartz Vein Material

SiO2

Quartzite / Quartz Pebble

Quartzite (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz-rich mica schist (probable)

Mica–quartz schist; mainly quartz (SiO₂) with muscovite/biotite mica and possibly feldspar

Quartz–feldspar pegmatite with pink tourmaline

Granitic pegmatite; predominantly quartz (SiO₂), microcline/orthoclase (KAlSi₃O₈), albite (NaAlSi₃O₈), and likely elbaite tourmaline (Na(Li,Al)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)

Rutilated Quartz (or Tourmalinated Quartz if inclusions are Tourmaline)

Silicon Dioxide (SiO2) with Rutile (TiO2) or Tourmaline inclusions

Pyrite in Quartz

Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)

Quartz-veined Sandstone

Sedimentary rock with quartz vein (SiO2)

Quartz-rich pebble (likely milky quartz)

Quartz, silicon dioxide (SiO₂), possibly a weathered quartzite fragment

Quartz Vein in Host Rock (Likely Slate or Shale)

Hydrothermal Quartz (SiO2) in Pelitic host rock

Ruby Fuchsite / Ruby in Fuchsite

Ruby (Al2O3 variety corundum) and Fuchsite (K(Al,Cr)2AlSi3O10(OH)2 - a chromium-rich variety of muscovite mica) in Quartz matrix

Gold Ore in Quartz

Native Gold (Au) in Quartz (SiO2) matrix

Auriferous Quartz (Gold-bearing Quartz)

Silicon Dioxide (SiO2) with Elemental Gold (Au)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Milky Quartz (Micro-specimen)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Smoky quartz (likely citrine-colored quartz) ring

Quartz, SiO₂; precise variety cannot be confirmed from the photograph

Rose quartz (tumbled)

Quartz, silicon dioxide (SiO₂), pink variety

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)