Green sea glass or tumbled green quartz (uncertain)
Likely quartz (SiO₂) if natural; alternatively man-made soda-lime glass
Category
Browse metamorphic (man made) specimens identified by the Rock Identifier community.
Green sea glass or tumbled green quartz (uncertain)
Likely quartz (SiO₂) if natural; alternatively man-made soda-lime glass
Green Obsidian Sphere (man-made glass)
Vitreous Silica with Chromium/Iron additives
Pink Tumbled Quartz (Dyed)
Silicon Dioxide (SiO2)
Clear quartz crystal (likely)
Quartz, silicon dioxide (SiO₂)
Transit Token (RTD Denver)
Nickel-plated brass or bronze alloy (Cu-Sn-Zn-Ni)
Quartz crystal (likely clear quartz)
Quartz, silicon dioxide (SiO₂)
Blue-green faceted gemstone, possibly glass or synthetic material
Not identifiable from the image; possible synthetic spinel or glass
Asphalt (Road Aggregate)
Bituminous conglomerate
Green Aventurine
Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
Mystic Topaz (Treated Quartz or Topaz)
Aluminum silicate fluoride hydroxide [Al2SiO4(F,OH)2] with thin-film metallic coating
Sandstone Concretion
Limonitic Sandstone Concretion
Terrazzo (Man-made Composite)
Cementitious or Resin-bound Lithic Composite
Opalite
Synthetic Opalite (Man-made glass)
Opalite
Man-made Glass (SiO2 + additives)
Blue Slag Glass
Man-made Silicon Dioxide (Amorphous)
Cullet Glass (Slag)
Amorphous Silicon Dioxide (Man-made)
Green Sea Glass
Man-made silicate glass (weathered)
Crushed Stone (Likely Limestone or Granite)
Calcium Carbonate (CaCO3) for Limestone / Quartz and Feldspar for Granite
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
Concrete Paver (Artificial Cementitious Rock)
Hydrated Portland Cement Aggregate
Asphalt Concrete (Bituminous Conglomerate)
Anthropogenic Bituminous Conglomerate
Cullet Glass (Slag Glass)
Amorphous Silicon Dioxide (Industrial Man-made)
Concrete Rubble with Aggregate
Hardened Portland Cement Paste with Coarse Aggregate
Concrete
Anthropogenic Conglomerate
Chert Arrowhead (Projectile Point)
Microcrystalline Quartz (Chert or Flint)
Hematite
Iron(III) oxide (Fe2O3)
Titanium-coated Metal Cube (Man-made Fidget Toy)
Titanium-anodized or electroplated alloy (e.g., Ti-coated Zinc or Aluminum)
Opalite
Synthetic Glass (Silica-based)
Costume Jewelry with Synthetic Gemstones
Synthetic Cubic Zirconia and Glass (SiO2 / ZrO2)
Aggregate Concrete
Anthropogenic Conglomerate (Technosol)
Asphalt Concrete
Bituminous Concrete
Opaline Glass (Opalite)
Synthetic Silicon Dioxide Glass
Titanium Aura Quartz
Titanium bonded Silicon Dioxide (SiO2 + Ti)
Pyrite in Quartz (Drill Core)
Silicon Dioxide (SiO2) with Iron Sulfide (FeS2) inclusions
Clear quartz fragment (rock crystal)
Quartz, silicon dioxide (SiO₂)
Clear Quartz Sphere (Rock Crystal)
Silicon Dioxide (SiO2)
Blue Goldstone
Auraventurine (Synthetic glass with cobalt and copper inclusions)
Aura Quartz (Titanium Quartz)
Titanium-coated Silicon Dioxide (SiO2 + Ti)
Concretion (Sandstone)
Carbonate-cemented Sandstone Concretion
Opalite
Synthetic Glass (Simulated Opal)
Opalite
Synthetic Glass (Simulated Opal)
Asphalt / Road Aggregate
Bituminous Conglomerate (synthetic)