Mineral Like (Natural Glass)

Sandstone

Arenite (primarily SiO2)

Sandstone (Quartzite-rich Pebble)

Arenite (primarily SiO2)

Quartz (Smoky Quartz variant)

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Dyed Quartzite (Pink/Magenta)

Silicon Dioxide (SiO2) - Artificially Colored Quartzite

Tumbled goldstone-like quartz pebble

Likely iron-stained quartz or jasper; exact identification requires testing

Aura Quartz (Titanium/Gold coated)

Silicon Dioxide (SiO2) with metallic vapor deposition

Sandstone

Arenite

Quartz (Double-Terminated)

Silicon Dioxide (SiO2)

Green Aventurine

SiO2 (Silicon Dioxide) with Fuchsite inclusions

Quartz Pebble with Mineral Inclusions

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2) with aluminum impurities

Green aventurine (likely)

Quartz variety; silicon dioxide (SiO₂) with fuchsite mica inclusions

Blue Obsidian

Obsidian

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 primarily)

Smoky Quartz (with inclusions)

Silicon Dioxide (SiO2)

Sandstone Cobble

Arenite (primarily SiO2)

Yellow quartz crystal (likely citrine)

Quartz, silicon dioxide (SiO₂), iron-colored variety commonly called citrine

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

Smoky Quartz

Silicon Dioxide (SiO2)

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

Emerald

Beryl (Be3Al2Si6O18 with chromium and vanadium impurities)

Yellow chalcedony (likely citrine-like quartz)

Cryptocrystalline quartz, SiO₂; possibly iron-stained chalcedony or pale citrine

Aura Quartz (Rainbow Quartz)

Silicon Dioxide (SiO2) with metallic vapor coatings

Ruby (Raw Corundum)

Al2O3 (Aluminum Oxide)

Yellow Quartz (Citrine Quartz)

Silicon Dioxide (SiO2)

Dyed blue chalcedony (likely dyed agate or quartzite)

Chalcedony, microcrystalline SiO₂; blue color likely artificial dye

Amethyst

Silicon dioxide (SiO2) with iron impurities

Green Aventurine (Quartz)

SiO2 (Silicon Dioxide with Fuchsite inclusions)

Green Aventurine (Propably a tumbled variety)

Aventurine Quartz (SiO2 with inclusions of Fuchsite)

Sandstone

Sandstone (clastic sedimentary rock composite)

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with Fe2O3 cement)

Chert (Green and Black Jasper variant)

Cryptocrystalline Quartz (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Smoky Quartz

Smoky Quartz (Silicon Dioxide - SiO2)

Blue Slag Glass

Amorphous Silica (Byproduct of smelting)

Tumbled smoky quartz

Quartz, silicon dioxide (SiO₂), smoky variety

Corundum (Sapphire/Ruby in Matrix)

Aluminium oxide (Al2O3)

Aventurine

Silicon Dioxide (SiO2) with inclusions

Clear Quartz

Quartz (Silicon dioxide, SiO2)