Concrete fragment with Aggregate
Anthropogenic Concrete with Calcarious and Siliceous Aggregate
sedimentary (anthropogenic/man-made)
Category
Man Made
Browse man made specimens identified by the Rock Identifier community.
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N/A - Non-Geological Item
not a rock/mineral
Opalite
Synthetic glass / Opalized glass
gemstone
Aura Quartz (Pink/Rose Aura Quartz)
Silicon Dioxide (SiO2) bonded with Platinum and/or Silver
mineral
Transit Token (RTD Denver)
Nickel-plated brass or bronze alloy (Cu-Sn-Zn-Ni)
not a rock or mineral (anthropogenic material)
Metal Chain Belt with Square Plates
Not applicable (man-made)
Man-made Object (Metalwork)
Quartz pebble (Quartztite fragment)
Silicon Dioxide (SiO2)
mineral
Opalite (likely man-made glass)
Opalite; amorphous silica glass, not a natural mineral
gemstone
Titanium-coated Metal Cube (Man-made Fidget Toy)
Titanium-anodized or electroplated alloy (e.g., Ti-coated Zinc or Aluminum)
Mineral alternative / Synthetic
Green obsidian (likely molded or heat-treated glass-like specimen)
Volcanic glass; predominantly rhyolitic composition (silica-rich amorphous SiO₂)
igneous
Likely tumbled red mineral or glass imitation
Indeterminate; possibilities include red jasper (microcrystalline quartz, SiO₂) or dyed chalcedony
mineral
Tumbled opalite (likely man-made glass)
Opalite glass; a synthetic opalescent glass, not a natural mineral species
mineral
Not a geological specimen
N/A (man-made object)
N/A
Dyed Imperial Jasper (Sea Sediment Jasper)
Silicon Dioxide (SiO2) - Impure Quartz/Chalcedony
sedimentary
Chert Arrowhead (Projectile Point)
Microcrystalline Quartz (Chert or Flint)
sedimentary
Sea Glass
Man-made silicate glass
sedimentary
Sea Glass
Man-made vitreous material
mineral
Crushed Stone (Likely Limestone or Granite)
Calcium Carbonate (CaCO3) for Limestone / Quartz and Feldspar for Granite
sedimentary or igneous
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)
Synthetic Resin Charm (Seal Shape)
Polymer Resin with plastic glitter / Polyethylene terephthalate glitters
Synthetic material (Not a rock or mineral)
Blue Goldstone
Man-made glass with suspended copper, cobalt, or manganese particles
man-made glass
Green Obsidian Sphere (man-made glass)
Vitreous Silica with Chromium/Iron additives
mineralogical simulant
Clear Quartz Sphere (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Blue Goldstone
Auraventurine (Synthetic glass with cobalt and copper inclusions)
Synthetic (Man-made Glass)
Polished opalite (likely man-made opalescent glass)
Opalite is a commercial name, not a mineral; typically opalescent glass, often soda-lime silicate glass
mineral
Blue glassy gemstone cabochon, likely dyed chalcedony or glass
Uncertain; possible dyed chalcedony (microcrystalline quartz, SiO₂)
gemstone
Opalite (likely man-made opalescent glass)
Opalite; not a true mineral, typically synthetic opalescent glass (silica-based)
mineral
Brick fragment (Man-made material)
N/A (Fired clay)
man-made
Tumbled Clear Quartz/Rock Crystal
Silicon Dioxide (SiO2)
mineral
Green glass-like mineral specimen, likely fluorite
Fluorite (calcium fluoride, CaF₂), if natural; appearance may also indicate colored glass
mineral
Cullet Glass / Slag Glass
Amorphous silica glass
man-made glass / industrial byproduct
One Pound Coin (UK)
Nickel-Brass Alloy (Cu-Zn-Ni)
mineral
Concrete rubble
Anthropogenic conglomerate
sedimentary
Quartz crystal fragment (likely milky quartz)
Quartz, silicon dioxide (SiO₂)
mineral
Dalmatian Stone
Dalmatian Jasper (a misnomer for an Aplite with Arfvedsonite spots)
igneous
Opalite
Synthetic glass / Opalized glass
gemstone
Diamond (or Simulant)
Carbon (C) or relevant simulant formula (e.g., ZrO2 for Cubic Zirconia)
gemstone