Quartz

Yellow Quartz

Silicon Dioxide (SiO2)

Quartz with Iron Staining

Silicon Dioxide (SiO2)

White Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milk Quartz

Silicon Dioxide (SiO2)

Strawberry Quartz

Silicon Dioxide (SiO2) with Hematite or Goethite inclusions

Likely tumbled amber or honey-colored quartz

Uncertain; possible amber (fossilized resin) or citrine quartz (SiO₂)

Quartz-veined metamorphic rock, likely schist or phyllite

Quartz-bearing mica schist/phyllite; exact identification requires closer examination

Quartz-rich granitic pegmatite

Quartz–feldspar pegmatite, with probable mica and iron-oxide staining

Biotite granite (possibly pegmatitic granite)

Granite: quartz (SiO₂), feldspar (KAlSi₃O₈–NaAlSi₃O₈), and biotite mica

Pink granite

Granite, predominantly quartz–feldspar–mica

Quartz-bearing feldspar pegmatite (likely with mica/tourmaline)

Granitic pegmatite; chiefly quartz (SiO₂) and feldspar, with dark mica or tourmaline

Quartz with Mica

Silicon Dioxide (SiO2) with Mica group inclusions

Quartz with Tourmaline

Silicon Dioxide with complex boro-silicate (Quartz: SiO2)

Quartz Veined Quartzite or Sandstone

Quartzite with Quartz Veins (SiO2)

Potassium Feldspar and Quartz

KAlSi3O8 (Potassium Feldspar) and SiO2 (Quartz)

Tumbled yellow chalcedony (probable)

Chalcedony, microcrystalline quartz (SiO₂), possibly iron-stained jasper

Tumbled white quartz

Quartz (silicon dioxide, SiO₂), likely milky quartz

Druzy Quartz on Limestone

Silicon Dioxide (SiO2) on Calcium Carbonate (CaCO3)

Quartz Vein in Host Rock

Silicon dioxide (SiO2) veins in metamorphic/igneous host rock

Geode (Quartz / Chalcedony Geode)

Silicon Dioxide (SiO2) - Quartz / Chalcedony

Quartz-rich granite or granitic gneiss

Granite; primarily quartz (SiO₂), feldspar, and mica, possibly weakly metamorphosed

Quartz with Muscovite Mica

Silicon Dioxide (SiO2) with Potassium aluminum silicate hydroxide fluoride [KAl2(AlSi3O10)(F,OH)2]

Quartz in Basalt (Xenocryst)

Silicon Dioxide (SiO2) in Mafic Igneous Volcanic Rock

Quartz

Quartz (SiO₂)

Worn quartz-rich pebble

Likely microcrystalline quartz (SiO₂), possibly a weathered chert or milky quartz fragment

Small tumbled quartz pebble

Quartz, silicon dioxide (SiO₂)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within Metasedimentary or Igneous Matrix

Tumbled quartz-rich stone, possibly milky quartz or quartzite

Quartz (SiO₂), potentially quartzite (metamorphic rock)

Clear faceted gemstone, likely quartz (rock crystal)

Quartz, silicon dioxide (SiO₂); visual identification is uncertain because the stone is heavily faceted and photographed with flash

Quartz (likely milky/rose quartz variety)

Quartz (SiO2 - Silicon Dioxide)

Milky Quartz

Silicon dioxide (SiO2)

Quartz fragment

Quartz (silicon dioxide, SiO₂)

Quartzite Pebble

Quartzite (primarily SiO2)

Quartzite

Quartzite (mainly SiO2)

Quartzite

Quartzite (SiO2)

Quartz

Quartz (SiO2)

Blue quartz (likely tumbled dyed or coated quartz)

Quartz, silicon dioxide (SiO₂)

Quartz-rich pegmatite fragment

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

Red Quartz

Silicon Dioxide (SiO2) with Hematite inclusions

Tumbled quartz-rich stone, possibly chalcedony or light sandstone

Quartz (SiO₂) if crystalline; possibly microcrystalline quartz (chalcedony) or quartz sandstone

Pink quartz (likely rose quartz)

Rose quartz; quartz, SiO₂