Goldstone
Aventurine Glass (Man-made)
mineral
Category
Mineraloid (Man Made Origin)
Browse mineraloid (man made origin) specimens identified by the Rock Identifier community.
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Sea Glass
Man-made silicate glass
gemstone
Slag Glass
Amorphous Silicate (Man-made)
industrial byproduct
Sea Glass
Man-made silicate glass
sedimentary
Sea Glass
Man-made vitreous material
mineral
Small pebble, likely limestone
Unidentified carbonate pebble, possibly micritic limestone (calcite, CaCO₃)
sedimentary
Seashell Fragment
Calcium carbonate (CaCO3) - primarily Aragonite or Calcite
fossil
Man-made Crystal (Lead Glass)
Lead oxide-doped Silica Glass (approx. SiO2 + PbO)
Mineraloid/Synthetic Material
Concrete Fragment
Artificial Conglomerate (Cement and Aggregate)
sedimentary
Black Obsidian
Obsidian (Volcanic Glass, SiO2 + impurities)
igneous
Diamond (or Simulant)
Carbon (C)
gemstone
Tektite (Indochinite)
Tektite (SiO2 + Al2O3)
mineraloid
Sea Glass
Silicon dioxide (mostly)
mineral
Quartz pebble (Quartztite fragment)
Silicon Dioxide (SiO2)
mineral
Carved Mottled Greenish-Yellow Crystal/Glass Object
Unknown; possibly a form of quartz (chalcedony/jadeite/nephrite) or glass/resin.
Man-made Object/Uncertain Mineral
Amber
Succiniferous fossil resin (C10H16O)
mineraloid
Stainless Steel (Polished)
Ferrous Alloy containing Iron (Fe), Chromium (Cr), and Carbon (C)
Mineral equivalent / Metal Alloy
Pearl (Biogenic Mineraloid)
Calcium carbonate (CaCO3) primarily as Aragonite
mineral
Cobalt Blue Glass / Cullet Glass
Silicon dioxide (Amorphous man-made glass)
mineral
Chert (Arrowheads)
Microcrystalline Quartz (SiO2)
sedimentary
Obsidian
Volcanic Glass (SiO2)
igneous
Pearl
Aragonite / Calcium Carbonate (CaCO3)
mineral
Amber
Succinite (Fossilized Tree Resin)
mineraloid
Exposed Aggregate Concrete (Pea Gravel)
Concrete with Siliceous Alluvial Gravels
sedimentary (man-made conglomerate)
Concrete Fragment
Hardened Portland cement and mineral aggregate
sedimentary (anthropogenic)
Opalite
Synthetic Opalite Glass / Opalized Glass
gemstone
Asphalt Concrete
Bituminous conglomerate
sedimentary
Slag (Industrial Byproduct)
Artificial silicate/iron byproduct
Mineral description (Anthropogenic material)
Transit Token (RTD Denver)
Nickel-plated brass or bronze alloy (Cu-Sn-Zn-Ni)
not a rock or mineral (anthropogenic material)
Blue-green faceted gemstone, possibly glass or synthetic material
Not identifiable from the image; possible synthetic spinel or glass
gemstone
Asphalt (Road Aggregate)
Bituminous conglomerate
sedimentary
Black Opal Ring (Carved Opal)
Hydrated Silicon Dioxide (SiO2·nH2O)
gemstone
![Mystic Topaz (Treated Quartz or Topaz) (Aluminum silicate fluoride hydroxide [Al2SiO4(F,OH)2] with thin-film metallic coating) — gemstone](https://media.rock.id/mystic-topaz-treated-quartz-or-topaz-b5749325-4a81-403d-a0ed-452e3335d125-thumbnail.jpg)
Mystic Topaz (Treated Quartz or Topaz)
Aluminum silicate fluoride hydroxide [Al2SiO4(F,OH)2] with thin-film metallic coating
gemstone
Sandstone Concretion
Limonitic Sandstone Concretion
sedimentary
Terrazzo (Man-made Composite)
Cementitious or Resin-bound Lithic Composite
sedimentary (artificial)
Opalite
Synthetic Opalite (Man-made glass)
mineral
Blue Slag Glass
Man-made Silicon Dioxide (Amorphous)
Anthropogenic (Man-made)
Green Sea Glass
Man-made silicate glass (weathered)
sedimentary
Crushed Stone (Likely Limestone or Granite)
Calcium Carbonate (CaCO3) for Limestone / Quartz and Feldspar for Granite
sedimentary or igneous
Concrete Paver (Artificial Cementitious Rock)
Hydrated Portland Cement Aggregate
Sedimentary (Synthetic)
Unidentifiable Rock Fragment
Uncertain
Asphalt Concrete (Bituminous Conglomerate)
Anthropogenic Bituminous Conglomerate
sedimentary