Quartz

Fire Quartz (Hematoid Quartz)

Silicon Dioxide with Hematite Inclusions (SiO2)

Likely rough quartz-bearing mineral specimen

Quartz (silicon dioxide, SiO₂), possibly iron-stained quartz or quartz-rich rock

Sunstone (variety of Feldspar)

Oligoclase Sunstone, Plagioclase Feldspar (Na,Ca)Al(Si,Al)Si2O8

Quartz (likely Clear Quartz or Rock Crystal)

Quartz (SiO2)

Weathered quartz-rich rock, possibly vein quartz

Quartz-rich rock; predominantly silicon dioxide (SiO₂), exact rock type uncertain from the photograph

Quartz with Iron Staining

Silicon Dioxide (SiO2) with Goethite/Limonite inclusions

Quartz-rich breccia or iron-stained quartz

Microcrystalline to crystalline quartz (SiO₂), with probable iron-oxide staining and minor host-rock fragments

Quartzite

Quartzite (SiO2)

Pink Quartz

Silicon Dioxide (SiO2) with trace inclusions

Quartz on Matrix

Silicon Dioxide (SiO2)

Mixed Mineral Collection (Quartz, Amethyst, Rose Quartz, Pyrite, etc.)

Mixed Silicates and Sulfides (SiO2, FeS2)

Quartz (River-worn Pebble)

Quartz (SiO2)

Tumbled quartz, likely citrine or iron-stained quartz

Quartz (SiO₂); the orange-brown color may result from iron-oxide staining

Quartz

Silicon Dioxide (SiO2)

Tumbled rose quartz

Quartz, silicon dioxide (SiO₂), rose-colored massive variety

Quartz-rich river pebble, likely milky quartz

Milky quartz (SiO₂), possibly a quartzite or quartz-rich silicate pebble

Quartz pebble

Quartz (Silicon Dioxide, SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble in Arkosic Sand

Silicon Dioxide (SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Quartzite

Quartzite

Quartzite pebble

Quartzite (primarily SiO2)

Quartz / Quartzite

Silicon Dioxide (SiO2)

Tumbled milky quartz (likely quartz or quartz-rich chalcedony)

Quartz, silicon dioxide (SiO₂)

Quartz Geode / Druzy Quartz Node

Silicon Dioxide (SiO2)

Milky quartz (likely quartz fragment)

Quartz, silicon dioxide (SiO₂)

Raw quartz (likely milky or smoky quartz)

Quartz, SiO₂

Tumbled smoky quartz or dark agate

Quartz, SiO₂; possibly chalcedony, microcrystalline SiO₂

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Rose Quartz

Silicon Dioxide (SiO2)

Red Quartz

Silicon Dioxide (SiO2) with Hematite inclusions

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Rose/Pink variety)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Cinnabar in Quartz

Silicon Dioxide (Quartz, SiO2) with Mercury Sulfide inclusions (Cinnabar, HgS)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Blue Quartz (Dumortierite Quartz)

Silicon Dioxide with Aluminum Borosilicate (SiO2 + AlAl6BSi3O18)

Rose Quartz

Silicon dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)