Opalite
Synthetic glass (SiO2 + impurities)
mineral
Category
Not A Rock (Man Made Polymer)
Browse not a rock (man made polymer) specimens identified by the Rock Identifier community.
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Diamond
Native Carbon (C)
gemstone
Conglomerate
Clastic Sedimentary Rock (Conglomerate)
sedimentary
Sandstone Concretion
Clastic Sedimentary Concretion (SiO2 with Iron Oxide)
sedimentary
Sea Glass
Man-made silicate glass
mineral
Sea Glass
Man-made silicate glass
sedimentary
Sea Glass
Man-made silicate glass
mineral
Sea Glass
Man-made silicate glass
sedimentary
Sea Glass
Man-made silicate glass
mineral
Sea Glass
Man-made vitreous material
gemstone
Sea Glass
Man-made silicate glass
sedimentary
Sea Glass
Man-made vitreous material
mineral
Transit Token (RTD Denver)
Nickel-plated brass or bronze alloy (Cu-Sn-Zn-Ni)
not a rock or mineral (anthropogenic material)
Sea Glass
Man-made silicate glass
mineral
Sea Glass
Man-made silicate glass
sedimentary
Blue Obsidian (Cullet Glass)
Man-made silicate glass
mineral
Sea Glass
Man-made silicate glass
mineral
Opalite
Man-made opalescent glass
gemstone
Opalite
Man-made opalized glass
mineral
Goldstone
Aventurine Glass (Man-made)
mineral
Sea Glass
Man-made silicate glass
gemstone
Slag Glass
Amorphous Silicate (Man-made)
industrial byproduct
Ring with an Orange Inlay
N/A (Man-made object)
Man-made Object (Ring)
Rose Quartz and Cherry Quartz (Dyed Glass/Quartz)
Silicon Dioxide (SiO2) with inclusions/dye
gemstone
Asphalt / Road Aggregate
Bituminous Conglomerate (synthetic)
sedimentary
Sea Glass
Amorphous silicon dioxide
mineral
Opalite
Synthesized glass / Silicon dioxide
gemstone
Opalite
Synthetic glass / Opaque silicious glass
gemstone
Concretion
Sedimentary Concretion (Ironstone / Calcite Concretion)
sedimentary
Sandstone Concretion
Sedimentary Clastic Rock (Silicate-rich)
sedimentary
Conglomerate
Conglomerate (Sedimentary rock containing rounded clasts)
sedimentary
Terrazzo (Synthetic Composite Rock)
Cementitious or Epoxy Resin-bound Aggregates
Man-made metamorphic-style composite
Concrete Fragment
Hardened Portland Cement Composite
Anthropogenic (Man-made material mimicking sedimentary rock)
Crescent Pebble
Weathered Quartzite or Sandstone Fragment
sedimentary
Small pebble, likely limestone
Unidentified carbonate pebble, possibly micritic limestone (calcite, CaCO₃)
sedimentary
Asphalt Concrete (Bituminous Pavement)
Aggregates in Bitumen Matrix
Technogenic / Anthropogenic Pavement Material
Tumbled clear quartz (rock crystal)
Quartz, silicon dioxide (SiO₂)
mineral
Concrete Fragment
Artificial Conglomerate (Cement and Aggregate)
sedimentary
Chakra Stone (Composite / Man-made Bonded Gemstones)
Composite of Quartz, Lapis Lazuli, Aventurine, Tiger's Eye, and Jasper (SiO2, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, etc.)
Combined Minerals / Metaphysical stones
Engineered Quartz Stone
Agglomerated Quartz (SiO2 + Polymer Resin)
mineral-based composite
Blue Obsidian
Volcanic Glass (Amorphous)
gemstone
Diamond (or Simulant)
Carbon (C)
gemstone