Not A Natural Rock

Ventifact

Eolian Ventifact (often composed of basalt, chert, or quartzite)

Green Aventurine

Aventurine Quartz (SiO2 with inclusions)

Granite Cobble

Phaneritic Felsic Igneous Rock

Shale or Siltstone

Sedimentary Rock (Siliciclastic)

River Quartz (Milky and Smoky mix)

Silicon Dioxide (SiO2)

Sandstone

Clastic Sedimentary Rock (composed mostly of quartz, SiO2)

Granite

Granite (Felsic Plutonic Rock)

Granite

Granite (Silicic Plutonic Rock)

Granite

Felsic Intrusive Igneous Rock

Shale with Iron Oxide Staining

Fissile Mudstone (primarily clay minerals and quartz)

Brown Sandstone

Arenite (primarily Quartz and Feldspar, with Iron Oxide cement)

Chevron Amethyst

Silicon Dioxide (SiO2) with iron impurities

Rough Sapphire (Corundum)

Corundum (Al2O3)

Sandstone

Arenite (SiO2 based)

Smoky Quartz (with possible Feldspar inclusions)

Silicon Dioxide (SiO2)

Pink Granite

Granite (Phaneritic intrusive igneous rock)

Giallo Ornamental Granite

Phaneritic Igneous Rock (composed of Quartz, Feldspar, and Mica)

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Smoky Quartz (Tumbled)

Smoky Quartz (SiO2 - Silicon Dioxide)

Shale

Fissile mudstone (rich in clay minerals and quartz)

Banded Agate (specifically Botswana Agate or Water-line Agate)

Chalcedony (cryptocrystalline variety of Quartz), SiO2

Granite

Phaneritic Felsic Igneous Rock

Dragon Vein Agate

Silicon Dioxide (SiO2)

Clear Quartz Crystal (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

Smoky Quartz

Silicon Dioxide (SiO2) with aluminum impurities

Emerald In Matrix

Beryl (Be3Al2Si6O18) with trace Chromium/Vanadium

Chevron Amethyst

Silicon Dioxide (SiO2) with iron impurities

Ironstone Concretion / Goethite-Hematite Nodule

Goethite/Hematite (α-FeO(OH) / Fe2O3)

Yooperlite (Syenite clast containing fluorescent Sodalite)

Sodalite-bearing Syenite

Quartz (Smoky/Milky Pebble)

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Sandstone

Arenite (Siliclastic sedimentary rock, primarily SiO2)

Purple Dyed Agate Geode (Banded Chalcedony)

Silicon Dioxide (SiO2) - variety: Agate

Travertine (Ceramic Tile)

Terrestrial Sedimentary Rock / Calcium Carbonate (CaCO3)

Green Aventurine

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

Sandstone Concretion

Arenaceous concretion (primarily SiO2 with Fe2O3 staining)

Pebble (likely Sandstone or Granitic Pebble)

Clastic Sediment (or specific rock type, e.g., Arenite, Granitoid Pebble)

Mixed Quartz and River Pebbles (Stone Collection)

Mixed assortment containing mainly Silicon Dioxide (SiO2)

Pink Granite

Phaneritic Felsic Igneous Plutonic Rock

Granite

Phaneritic Felsic Igneous Rock (Granite)

Painted Garden Rock (likely Granite or Limestone base)

Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3) based substrate with Acrylic/Enamel pigments

Basalt with Scoria/Vesicular Texture

Vesicular Basalt (Iron-rich/Oxidized)