Man Made Glass (Not A Natural Rock Or Mineral)

Granite Pebble

Felsic Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)

Fursuit (Synthetic Fur Specimen)

Canis anthropomorphus syntheticus

Magnetite (Lodestone variety)

Magnetite (Fe3O4)

Rose Quartz Carving

Quartum roseum (Variety of Quartz, SiO2)

Sandstone (with Feldspathic/Arkose qualities)

Arenite (primarily SiO2 with KAlSi3O8 components)

Sandstone (Quartz-rich)

Clastic sedimentary rock (SiO2 primary)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Iron Oxide cement)

Granitoid (Granite/Gneiss)

Granitoid silicate rock, primarily quartz and feldspar

Quartzite

Metamorphic Quartz (SiO2)

Green Aventurine

Silicon dioxide (SiO2) with fuchsite inclusions

Quartz

Quartz (SiO2 - Silicon Dioxide)

Quartz (Riverstone / Cobble)

Silicon Dioxide (SiO2)

Sandstone

Arenite

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Sandstone (Weathered Cobble)

Clastic Sedimentary Rock (primarily SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

River Quartz Pitting/Cobble

Silicon Dioxide (SiO2)

Amethyst

Amethyst (Silicon Dioxide, SiO2 + Fe)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Smoky Quartz (with complementary stones in jewelry setting)

Smoky Quartz (Silicon Dioxide - SiO2)

Smoky Quartz

Smoky Quartz (Silicon Dioxide, SiO2)

Green Aventurine

Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with Fe2O3 cement)

Sandstone with Iron Oxide

Arenite (SiO2 with Fe2O3 staining)

White Quartz Pebble (Milky Quartz)

Silicon Dioxide (SiO2)

Citrine Quartz

Silicon Dioxide (SiO2)

Granitic Quartz with Feldspar

Granite (composed primarily of SiO2 and KAlSi3O8)

Chevron Amethyst

Silicon Dioxide (SiO2) with iron impurities

Quartz on Host Rock

Silicon Dioxide (SiO2)

Sandstone

Arenite (composed primarily of Quartz: SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Clear Quartz Crystal

Quartz (Silicon Dioxide, SiO2)

Petrified Wood (Silicified Wood)

Silicified Paleoflora (mainly Quartz, SiO2)

Mica (Biotite or Phlogopite variety)

Phyllosilicate (complex mineral formula involving K, Mg, Fe, Al, Si, and O)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide inclusions (Hematite/Goethite)

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Pyrite

Iron Disulfide (FeS2)

Jasper with Quartz inclusion

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartz (River Siltstone Quartzite Pebble)

Silicon Dioxide (SiO2)