Tumbled quartz pebble
Quartz, silicon dioxide (SiO₂), likely milky quartz
Category
Browse antropogenic (man made industrial byproduct) specimens identified by the Rock Identifier community.
Tumbled quartz pebble
Quartz, silicon dioxide (SiO₂), likely milky quartz
Pyrite in Quartz (Drill Core)
Silicon Dioxide (SiO2) with Iron Sulfide (FeS2) inclusions
Aura Quartz (Rainbow Quartz)
Silicon Dioxide (SiO2) with metallic vapor coatings
Sandstone Concretion
Septarian or Carbonate-cemented Sandstone Concretion
Ferrocoke or Slag
Anthropogenic pyrometallurgical residue
Opalite
Synthetic opalescent glass
Asphalt (Bituminous Pavement)
Bituminous mix (Aggregates with Bitumen binder)
Goldstone
Aventurine glass
Green glass-like mineral specimen, likely fluorite
Fluorite (calcium fluoride, CaF₂), if natural; appearance may also indicate colored glass
Likely metallic meteorite fragment
Undetermined; possibly an iron meteorite or stony-iron meteorite
Opalite (likely man-made opalescent glass)
Opalite; not a true mineral, typically synthetic opalescent glass (silica-based)
Brick fragment (Man-made material)
N/A (Fired clay)
Opalite
Synthetic Opalised Glass
Chert (Arrowhead Debitage or Spall)
Silicon Dioxide (SiO₂)
Opalite
Man-made Synthetic Glass (Silicon Dioxide with metal additives)
Tumbled clear quartz (rock crystal)
Quartz, silicon dioxide (SiO₂)
Polished labradorite sphere
Labradorite, calcic plagioclase feldspar ((Ca,Na)(Al,Si)₄O₈)
Polished labradorite pendant
Labradorite, a calcium-rich plagioclase feldspar (approximately NaAlSi₃O₈–CaAl₂Si₂O₈)
Citrine Quartz
Citrine (Silicon Dioxide, SiO2)
Labradorite
Labradorite ((Ca, Na)(Al, Si)4O8)
Hematite
Iron(III) oxide (Fe2O3)
Opalite
Synthetic Opalite Glass
Red Sandstone or Brick Fragment
Arenite (if sandstone)
Cherry Quartz
SiO2 (Silicon Dioxide with iron-rich inclusions/dye)
Likely clear quartz pebble or glassy quartz fragment
Quartz (silicon dioxide, SiO₂)
Aventurine Quartz
Silicon Dioxide (SiO2) with Fuchsite inclusions
Moldavite
Tektite (Impact Glass), ~80% SiO2 + Al2O3
Strawberry Quartz
Silicon Dioxide (SiO2) with Hematite or Goethite inclusions
Opalite (Man-made Glass)
Fused glass (typically made of dolomite and metal opacifiers)
Ferro-Manganese Slag
Vitreous Silicate Slag
Slag (Industrial Glass/Metal Waste)
Artificial silicate/ferro-silicate byproduct
Goldstone (Brown/Gold)
Aventurine Glass (Man-made glass with Copper inclusions)
Opalite crescent pendant
Opalite (man-made opalescent glass; not a natural mineral)
Sea Glass
Man-made vitreous material (silica-based glass)
Sea Glass
Man-made silicate glass (Amorphous silicon dioxide)
Goldstone
Aventurine Glass (Man-made glass with copper inclusions)
Decorative mosaic cross containing mixed rock and glass fragments
Polychrome aggregate; likely quartz, feldspar, marble, granite, and assorted colored glass
Blue cabochon gemstone, likely synthetic glass or dyed stone
Indeterminate from image; possible glass, synthetic spinel, sodalite, or lapis lazuli
Bismuth
Bismuth (Bi)
Slag
Anthropogenic Vitrophyre (Iron or Smelting Slag)
Cubic Zirconia (Man-made)
Cubic Zirconia (ZrO2) with Enamel and Metal Alloy
Opalite
Synthetic Opalised Glass