Mineral (Man Made Glass)

Quartz

Silicon Dioxide (SiO2)

Quartz (Crystal Point/Fragment)

Silicon Dioxide (SiO2)

Rough Quartz (likely Milky or Smoky Quartz)

Silicon Dioxide (SiO2)

Likely weathered quartz-rich stone

Probably quartz-bearing sandstone or milky quartz; exact identification requires testing

Quartz

Silicon Dioxide (SiO2)

Quartz (Smoky/Rock Crystal)

Silicon Dioxide (SiO2)

Quartz

Silicon dioxide (SiO2)

Green Aventurine

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

Black Obsidian

Obsidian (Volcanic Glass, SiO2 + impurities)

Quartz-rich rock fragment

Microcrystalline quartz (SiO₂), possibly chalcedony or quartz-bearing breccia

Quartz (Milky/Gold-stained)

Silicon Dioxide (SiO2)

Quartz with Pyrite inclusions

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)

Aventurine

Silicon dioxide (Quartz) with inclusions (KAl2(AlSi3O10)(OH)2)

Obsidian

Volcanic Glass (predominantly SiO2)

Tumbled pale stone, likely milky quartz or calcite

Quartz (SiO₂) or calcite (CaCO₃); exact identification requires testing

Likely polished/tumbled quartz-rich specimen

Quartz, silicon dioxide (SiO₂), possibly an agate or chalcedony variety

Sandstone (Weathered Pebble)

Sedimentary Rock (Quartz arenite)

Quartz with Iron Staining

Silicon Dioxide (SiO2) with Goethite/Limonite inclusions

Citrine (Heat-treated Amethyst)

Silicon Dioxide (SiO2) with iron impurities

Lepidolite

Lepidolite (K(Li,Al)3(Si,Al)4O10(F,OH)2)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Quartz Druzy on Matrix (with Copper Mineralization)

Silicon Dioxide (SiO2) with Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·n H2O)

Quartz (specifically Clear Quartz with iron/hematite staining)

Silicon Dioxide (SiO2)

Clear Quartz Cluster

Silicon Dioxide (SiO2)

Quartz Vein in Siltstone

SiO2 (Quartz) on clastic sedimentary matrix

Vuggy Quartz on Matrix

Crystalline Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky quartz-rich rock

Quartz (SiO₂), likely massive milky quartz with minor iron-stained gangue

Yellow Quartz

Silicon Dioxide (SiO2)

Quartzite Pebble

Metamorphic Quartzite (SiO2)

Chert / Quartz Pebble

Silicon Dioxide (SiO2)

Jasper

Microcrystalline quartz (SiO2)

Quartz with Schist Inclusion

Crystalline Silicon Dioxide (SiO2) with Muscovite/Biotite Schist

Quartz Pebble

Silicon Dioxide (SiO2)

Citrine

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Smoky/Milky variety with matrix)

Silicon Dioxide (SiO2)

Quartz with Iron Stains

Silicon Dioxide (SiO2) with FeOx inclusions

Green Aventurine

SiO2 (Quartz with Fuchsite inclusions)

Potassium Feldspar (Orthoclase)

Orthoclase (KAlSi3O8)

Quartz pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)