Manufactured Glass (Simulant)

Milky Quartz

Silicon Dioxide (SiO2)

Quartzite

Quartzite (SiO2)

Feldspar (Orthoclase)

Potassium Alveolar Silicate (KAlSi3O8)

Quartz (Milky/Clear Fragment)

Silicon Dioxide (SiO2)

Sandstone

Arenite (primarily SiO2)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Crystal

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz pebble

Silicon dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Milky Quartz in Epidote Host Rock

Crystalline Silicon Dioxide (SiO2) with Epidote Ca2(Al,Fe)3(SiO4)3(OH)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Crystal (Amethyst)

Silicon Dioxide (SiO2)

Quartzite river pebble

Quartzite (SiO2)

Blue slag glass or dyed glass-like industrial material

Amorphous silicate glass; likely copper-bearing blue slag, but possibly colored man-made glass

Chert

Microcrystalline Quartz (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Sand Grain (Quartz)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Quartz (Silicon Dioxide, SiO2)

Quartzite Pebble

Quartzite (primarily SiO2)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Milky quartz

Quartz (SiO₂)

Blue chalcedony (likely dyed or assembled cabochon)

Microcrystalline quartz, SiO₂ (chalcedony)

Potassium Feldspar (Orthoclase Pebble)

KAlSi3O8 (Potassium aluminum silicate)

Pink feldspar crystal

Likely potassium feldspar (orthoclase or microcline), KAlSi₃O₈

Tumbled feldspar-rich rock, likely pink-orange microcline or granite fragment

K-feldspar (microcline/orthoclase), approximately KAlSi₃O₈; exact identification requires testing

Quartzite

Quartzite (mostly SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartzite Pebble

Metamorphosed Quartz-rich Sandstone (SiO2)

Quartzite Pebble

Metamorphic Quartzite (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartzite Pebble

Quartzite (primarily SiO2)

Limestone Pebble

Sedimentary Calcium Carbonate (CaCO3)

Sandstone

Arenite (SiO2 primarily)

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Sandstone

Arenite (SiO2 primarily)