Synthetic (Man Made Glass)

Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartzite

Quartzite (primarily SiO2)

Green Fluorite

Calcium Fluoride (CaF2)

Green Fluorite

Calcium Fluoride (CaF2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz Crystal

Quartz (Silicon Dioxide, SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Carved Merkaba)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz Crystal

Quartz (Silicon Dioxide, SiO2)

Clear Quartz (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

Rough Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Amethyst

Silicon Dioxide with iron impurities (SiO2)

Amethyst

Amethyst (Silicon Dioxide with iron impurities), SiO2

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Pink Granite

Phaneritic Felsic Igneous Rock

Citrine

Silicon Dioxide (SiO2)

Jasper (specifically a banded or dark variety)

Silicon Dioxide (SiO2) with impurities

Black Onyx

Silicon Dioxide (SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Clear Quartz Fragment

Quartz (Silicon Dioxide, SiO2)

Quartzite Pebble

Quartzite (mostly SiO2)

Quartz Geode

Crystalline Silicon Dioxide (SiO2) in Geode form

Chert (Flint)

Silicon Dioxide (SiO2)

Quartzite

Quartzite (SiO2)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Orthoclase Feldspar with Quartz

Orthoclase (KAlSi3O8)

Sandstone

Arenite

Pyritic Quartzite

Metequartzite with FeS2 (Pyrite) inclusions

Sandstone (Ferruginous)

Arenite (with Iron Oxides)

Sandstone (Ferruginous)

Arenite (Fe2O3 dominant staining)

Quartzite with Quartz Vein

Metamorphosed sandstone (SiO2)

Sandstone (Ferruginous)

Arenite (SiO2 with iron oxide impurities)

Quartzite

Quartzite (primarily SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with iron oxide Fe2O3 cement)

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (primarily Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)