Mineraloid (Man Made Glass)

Quartz (Citrine or Iron-Stained)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (primarily SiO2)

Sandstone

Arenite (primarily SiO2)

Sandstone (Ferruginous)

Arenite (Fe-rich)

Sandstone

Arenite (primarily SiO2)

Sandstone

Clastic Sedimentary Rock (composed of SiO2 grains)

Lepidolite on Pegmatite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2) in Granitic Pegmatite

Clear Quartz

Quartz (Silicon Dioxide - SiO2)

Quartz (Quarzite or Massive Quartz vein)

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)

Quartz (Clear/White)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Sandstone (with potential iron-oxide staining)

Arenite (primarily SiO2)

Milky Quartz

Silicon dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Chert/Chalcedony variety)

Silicon Dioxide (SiO2)

Sandstone (Quartzose Sandstone)

Arenite (primarily SiO2)

Sandstone (Water-worn Pebble)

Clastic sedimentary rock (primarily SiO2)

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

Clear Quartz

SiO2 (Silicon Dioxide)

Clear Quartz crystals on a Matrix base (Geode fragment)

Silicon Dioxide (SiO2)

Potassium Feldspar

Orthoclase (KAlSi3O8)

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Chert (Common Opal/Agate mixture)

Microcrystalline Quartz (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartzite Pebble

Recrystallized Silicon Dioxide (SiO2)

Quartzite

Quartzite (SiO2)

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite mica

Chert / Flint

Chert (Silicon Dioxide, SiO2)

Yellow Aventurine

Quartzite with Muscovite/Sericite inclusions (SiO2 + KAl2(AlSi3O10)(OH)2)

Orange Quartzite (or Ferruginous Quartz)

Quartzite (primarily Silicon Dioxide, SiO2)

Quartzite

Quartzite (primarily SiO2)

Green Aventurine

Silicon dioxide (SiO2) with fuchsite inclusions

Yellow Aventurine

Silicon Dioxide with inclusions (SiO2 + Muscovite/Fuchsite)

Chert with Iron Staining

Microcrystalline Quartz (SiO2)