Manufactured Glass (Simulant)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Quartzite Pebble

Quartzite (SiO2 with minor impurities)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Agate (Crazy Lace or Eye Agate)

Silicon Dioxide (SiO2)

Green Glass (often marketed as 'Obsidian' or 'Green Quartz')

Amorphous Silica (SiO2) with copper or chromium additives

Muscovite Mica (on Quartz Matrix)

Muscovite - KAl2(AlSi3O10)(OH)2

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Massive Milky Quartz (with Iron Inclusions)

Quartz (Silicon Dioxide, SiO2)

Smoky Quartz

Silicon Dioxide (SiO₂)

White Quartz Pebbles

Quartz (Silicon Dioxide, SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

Sandstone (with cross-bedding)

Arenite (composed primarily of Quartz: SiO2)

Quartzite

Quartzite (SiO2)

Clear Quartz Point

Silicon Dioxide (SiO2)

Cloud Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Orthoclase Feldspar (Sunstone variety)

KAlSi3O8 (Potassium Aluminum Silicate)

Quartz Pebble

Quartz (Silicon Dioxide - SiO2)

Quartz (Chert/Chunky Chalcedony)

Silicon Dioxide (SiO2)

Iron-stained Quartz

Silicon Dioxide with Hematite/Limonite impurities (SiO2 + Fe2O3)

Quartzite

Quartzite (primarily SiO2)

Sandstone (Quartzite-rich)

Clastic sedimentary rock (SiO2 primary)

Quartz (Milky or Pink-tinged)

Silicon Dioxide (SiO2)

Quartzite

Quartzite (composed primarily of SiO2)

Pink Quartzite

Silica (SiO2) - Metamorphic rock

Quartzite

Quartzite (primarily SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Aragonite Star Cluster

Aragonite (Sputnik habit) - CaesarCO3

Sandstone (Quartzose Sandstone)

Arenite (primarily SiO2)

Sandstone

Arenite (primarily SiO2)

Yellow Quartz (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Chert (Arrowhead Debitage or Spall)

Silicon Dioxide (SiO₂)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone (Red Arkose)

Sandstone (Arkose variant, primarily SiO2 with KAlSi3O8)

Pyrite

Iron Disulfide (FeS2)

Sandstone

Arenite (primarily SiO2)

Sandstone (Stream-rounded)

Arenite (SiO2 based)

Fluorite

Fluorite (Calcium Fluoride, CaF2)

Smoky Quartz and Biotite Schist

Quartz-Biotite Schist (SiO2 + K(Mg,Fe)3AlSi3O10(F,OH)2)

Quartzite

Quartzite (primarily SiO2)