Man Made Glass (Not A Natural Rock Or Mineral)

Clear quartz crystal

Quartz (silicon dioxide, SiO₂)

Granite

Phaneritic Felsic Igneous Rock

Gravel and Sand Aggregate

Unconsolidated Clastic Sediment

Yellow Quartz / Chalcedony

Silicon Dioxide (SiO2)

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Faceted Clear Quartz or Diamond Simulant

Silicon Dioxide (SiO2) if Quartz or Cubic Zirconia (ZrO2) if Synthetic

River Pebbles (Chert and Quartzite)

Sedimentary Clastic Rock (Silica-rich)

Sandstone

Arenite

Quartz (Yellow / Citrine Pebble)

Silicon Dioxide (SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone

Sandstone (clastic sedimentary rock)

Sandstone (Sedimentary Rock)

Arenite (SiO2 based)

Red Sandstone

Arenite (Fe2O3 enriched)

Green Aventurine

Silicon Dioxide (Quartz variety) with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Sandstone Pebble

Arenite (Sandstone)

Colorless faceted gemstone, likely cubic zirconia

Cubic zirconia (synthetic zirconium dioxide, ZrO₂); possibly colorless quartz or laboratory diamond

Sandstone

Arenite

Tektite (specifically Indochinite)

Tektite (Natural silica glass)

Weathered granite-like rock

Granite, likely biotite-bearing; exact identification is uncertain from the image

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 oxides)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Tumbled jasper or chert

Microcrystalline quartz (SiO₂), possibly iron-bearing jasper

River Cobble (Quartzite)

Meta-orthoquartzite

Dark gray rounded stone, possibly basalt or slag

Uncertain; likely fine-grained basalt (plagioclase–pyroxene) or iron-rich industrial slag

Granodiorite

Granodiorite

Chert (Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Granodiorite

Intrusive Igneous Rock

Brown chalcedony (likely carnelian/iron-stained quartz)

Microcrystalline quartz, SiO₂; brown coloration from iron oxides/hydroxides

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Chert (River Siltstone/Quartzite type)

Microcrystalline Quartz (SiO2)

Lava Rock (Dyed)

Basalt / Volcanic scoria

Vesicular Basalt (or Scoria)

Vesicular Basalt

Chert (Green and Black Jasper variant)

Cryptocrystalline Quartz (SiO2)

Titanium Aura Quartz

Titanium-coated Silicon Dioxide (SiO2)

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

Quartzite

Quartzite (SiO2)

Earth

Terra / Earth

Diamond

Carbon (C)

Shale

Shale (Lutite)

Milky Quartz

Silicon Dioxide (SiO2)