Igneous, Metamorphic, And Sedimentary

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Grain/Fragment)

Silicon Dioxide (SiO2)

Quartz (Milky or Yellowish)

Silicon Dioxide (SiO2)

Quartz (Yellow / Citrine Quartz Pebble)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Pyrite with Quartz

Iron Sulfide (FeS2) with Silicon Dioxide (SiO2)

Iron-stained Quartz

Silicon Dioxide (SiO2) with Hematite/Limonite inclusions

Quartz

Silicon dioxide (SiO2)

Magnetite / Ironstone

Iron(II,III) oxide (Fe3O4)

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Milky or Smoky variant)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Milky/Crystal variety)

Silicon Dioxide (SiO2)

Quartz (Water-worn Pebbles)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

White Quartz Pebble

Crystalline Silicon Dioxide (SiO2)

Hematite

Ferric Oxide (Fe2O3)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Citrine / Yellow Quartz)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Rough Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Clear Quartz)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

Magnetite / Hematite mix (Iron Ore)

Fe3O4 (Magnetite) / Fe2O3 (Hematite)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Magnetite (Lodestone)

Magnetite (Fe3O4)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO₂)

Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Hematite

Iron(III) oxide (Fe2O3)

Quartz on Matrix

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Crystal Quartz)

Silicon Dioxide (SiO2)