Sandstone (with Possible Iron Staining/Crust)
Arenite (SiO2 based)
sedimentary
Category
Mineral Like (Natural Glass)
Browse mineral like (natural glass) specimens identified by the Rock Identifier community.
Clear Quartz Crystal
Quartz (Silicon Dioxide, SiO2)
mineral
Slag Glass
Amorphous Silica Glass (with metal oxide inclusions)
Mineraloid / Industrial Waste
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Strawberry Quartz (Lepidocrosite/Hematite-Included Quartz)
Quartz (Silicon Dioxide) with Lepidocrosite or Hematite inclusions (SiO2 + Fe2O3 · nH2O)
mineral
Quartz Vein with Iron Staining
Silicon Dioxide (SiO2) with limonite/hematite staining
mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Smoky Quartz (SiO2 - Silicon Dioxide with trace impurities of aluminum)
mineral
Herkimer Diamond
Quartz (Silicon Dioxide) - SiO2
mineral
Opalite
Man-made glass (traditionally simulated Opal)
mineral
Blue Sapphire
Corundum (Al2O3 with trace amounts of iron and titanium)
mineral
Almandine Garnet & Tumbled Citrine Quartz
Fe3Al2(SiO4)3 (Garnet) and SiO2 (Quartz)
mineral
Sandstone (Quartzose)
Arenite (SiO2 principal)
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Goldstone
N/A (Synthetic Glass with Copper Inclusions)
Manufactured Glass
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon dioxide (variant with ferric iron impurities), SiO2
mineral
Green Aventurine
Aventurine Quartz (SiO2 with inclusions of Fuchsite)
metamorphic
Smoky Quartz Cluster
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2) with natural radiation induced color centers
mineral
Quartz (Water-worn pebble)
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon dioxide with aluminum impurities (SiO2)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Opalite
Synthetic Glass (SiO2 + impurities)
mineral
Sandstone (Micaceous)
Arenite (composed primarily of SiO2)
sedimentary
Cullet (Slag Glass)
Amorphous Silica (Industrial byproduct)
mineraloid
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Citrine
Silicon Dioxide (SiO2) with iron impurities
Mineral
Goldstone (Brown/Gold variety)
Aventurine Glass (SiO2 with Copper inclusions)
Synthetic/Man-made glass (often mistaken for a mineral)
Rough Corundum (likely Sapphire/Zircon-bearing)
Aluminium Oxide (Al2O3)
mineral
Amethyst
Silicon Dioxide with iron impurities (SiO2)
mineral
Strawberry Quartz
Silicon Dioxide (SiO2) with Hematite/Goethite inclusions
mineral
Red aventurine
Silicon Dioxide (SiO2) with Hematite/Goethite inclusions
metamorphic
Goldstone and Aura Quartz
Cuprous Glass (Goldstone) and Titanium-coated SiO2 (Aura Quartz)
Mineral/Glass Specimen
Yellow Quartz / Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Strawberry Quartz (Red Aventurine)
Silicon Dioxide (SiO2) with Hematite/Goethite inclusions
mineral
Blue Topaz
Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Sandstone (Quartzose Sandstone)
Arenite (SiO2 principal component)
sedimentary
River Stone (likely Mudstone or Siltstone)
Lutite (Clastic sedimentary rock composed of clay and silt-sized particles)
sedimentary