Opalite
Synthetic Opalized Glass / Man-made Glass
gemstone
Category
Man Made Material, Not A Natural Rock Or Mineral Specimen
Browse man made material, not a natural rock or mineral specimen specimens identified by the Rock Identifier community.
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Sandstone
Arenite
sedimentary
Sandstone (likely Fossilized Wood or Concrete Simulacrum)
Arenite / Silicified Wood / Anthropogenic Concrete
sedimentary
Sandstone (likely Fossiliferous)
Arenite / Fossiliferous Sandstone (SiO2 composition)
sedimentary
Diamond
Native Carbon (C)
gemstone
Sandstone
Arenite (SiO2 based clastic rock)
sedimentary
Asphalt (Bituminous pavement)
Bituminous concrete / Asphalt
Sedimentary (Anthropogenic)
Transit Token (RTD Denver)
Nickel-plated brass or bronze alloy (Cu-Sn-Zn-Ni)
not a rock or mineral (anthropogenic material)
Granite
Granite (phaneritic intrusive igneous rock consisting of quartz, feldspar, and mica)
igneous
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Goldstone (Red)
Aventurine Glass
Man-made material (Simulated Mineral)
Opalite
Synthetic Glass / Man-made Opal Simulant
gemstone
Brecciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Sea Glass
Amorphous silicon dioxide (SiO2) - Man-made glass tumbled by nature
mineral
Chert (Chalcedony/Agate variety)
Silicon Dioxide (SiO2)
sedimentary
Chalk
Calcium carbonate (CaCO3)
sedimentary
Acrylic or Resin (Synthetic Imitation)
Polymethyl Methacrylate (PMMA) or Polyepoxide
Synthetic/Man-made Polymer
Opalite
Synthetic Glass (typically Silica/Magnesium based with metal additives)
mineral
Diamond (in a jewelry setting)
Carbon (C)
mineral
Sandstone Pebble
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
White quartz pebble
Quartz (SiO₂), likely milky quartz
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Asphalt Pavement (with aggregate)
Asphalt concrete
man-made composite
Mother of Pearl (Nacre) / Shell Fragment
Biogenic Calcium Carbonate (Aragonite and Conchiolin)
fossil
Sandstone
Arenite (specifically sublithic or quartz arenite)
sedimentary
Eroded Brick or Pumice-like Scoria
Vesicular Basalt / Scoria (Anthropogenic variant: Eroded Firebrick)
igneous
Man-made Synthetic Material (Costume Faux Fur)
Synthetic Polymer (Polyester/Acrylic)
not a rock
Polished black stone, likely black obsidian
Obsidian (volcanic glass), chiefly silica-rich rhyolitic composition
igneous
Sea Glass
Amorphous Silicon Dioxide (Man-made glass weathered by nature)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Chert (Chalky Flint Node)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Sandstone
Sandstone (SiO2 dominated)
sedimentary
Green Glass Cullet / Recycled Glass
Amorphous Silicon Dioxide (SiO2) with various metal oxides
Man-made Glass (Not a natural rock or mineral)
Dyed Blue Agate Slice
Silicon Dioxide (SiO2)
mineral
Dyed Crackle Quartz
Silicon Dioxide (SiO2) with synthetic dye
mineral
Diamond
Carbon (C)
mineral
Corundum (Sapphire/Ruby in Matrix)
Corundum (Al2O3)
mineral
Green Slag Glass
Cullet (Amorphous Silicon Dioxide with impurities)
Man-made rock-like material
Blue Goldstone
Man-made glass with crystalline copper/cobalt inclusions
mineral
Yellow Quartz (Citrine Quartz Pebble)
Silicon Dioxide (SiO2)
mineral
Weathered iron-rich concretion or ironstone nodule
Goethite–hematite limonite concretion (FeO(OH), Fe₂O₃, and hydrated iron oxides)
sedimentary
Sandstone Concretion
Sedimentary Clastic Rock (Silicate-rich)
sedimentary