Mineral (Chalcedony Variety)

Quartz

Silicon Dioxide (SiO2)

Quartz (Milky Quartz / Quartzite)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz (Tumbled)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Almandine Garnet in Schist

Almandine, Fe3Al2(SiO4)3

Amygdaloidal Basalt

Amygdaloidal Basalt (extrusive volcanic rock with secondary mineral infilling)

New Jade (Serpentine)

Antigorite / Serpentine Group (Mg3Si2O5(OH)4)

Jasper with Quartz Veining

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Orthoclase Feldspar

Potassium aluminum silicate (KAlSi3O8)

Geode (Unbroken)

Silicon Dioxide (SiO2) usually as Microcrystalline Quartz or Chalcedony

Quartz (Raw Chunk)

Silicon Dioxide (SiO2)

Hawk's Eye (Blue Tiger's Eye)

Quartz (fibrous crocidolite variety)

Agate Slices and Clear Quartz Points

Agate (SiO2 Chalcedony) and Clear Quartz (SiO2 Crystalline)

Carnelian

Chalcedony (Silicon Dioxide, SiO2 with Iron Oxide impurities)

Carnelian Agate

Chalcedony (Silicon Dioxide, SiO2) with Iron Oxide impurities

Tiffany Stone

Bertrandite (with Fluorite, Opal, and Chalcedony), Be4Si2O7(OH)2

Carnelian Agate

Chalcedony (Silicon Dioxide, SiO2) with Iron Oxide impurities

Blue Quartz (Aventurine)

Silicon Dioxide (SiO2) with fibrous inclusions (commonly Dumortierite)

Morganite (Pink Beryl)

Beryllium aluminum silicate Be3Al2(SiO3)6

Milky Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Agatized Petrified Wood

Silicon Dioxide (SiO2) - Chalcedony pseudomorph after Wood

Milky Quartz

Silicon Dioxide (SiO2)

Halite

Halite (Sodium Chloride, NaCl)

Smoky Quartz with Calcite/Quartz Veining

Silicon Dioxide (SiO2)

Milky Quartz

Crystalline Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Milky Quartz in Matrix

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Tiger's Eye (specifically Blue Tiger's Eye / Falcon's Eye)

Pseudomorph of Quartz after Crocidolite (SiO2)

Sandstone

Arenite (primarily SiO2)

Sandstone (likely Quartzite-grade)

Arenite (primarily SiO2)

Blue Quartz (Blue Aventurine)

Silicon Dioxide (SiO2) with inclusions (typically crocidolite or dumortierite)

Caribbean Calcite

Calcium Carbonate with Argonite (CaCO3)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2) / Rock Crystal

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon dioxide (SiO2)