Red Sandstone or Brick Fragment
Arenite (if sandstone)
sedimentary
Category
Anthropogenic Specimen (Man Made Material)
Browse anthropogenic specimen (man made material) specimens identified by the Rock Identifier community.
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Blue Goldstone
Man-made glass with crystalline copper/cobalt inclusions
mineral
Quartz (Engineered Stone Countertop)
Silicon Dioxide (SiO2) with polymer resins
Sedimentary-like (Industrial Composite)
Libyan Desert Glass
Tektite (high-silica impact glass), SiO2
mineral
Carborundum (Silicon Carbide)
Silicon Carbide (SiC)
mineral
Zinc Alloy (Silver-plated)
Zinc Alloy Casting (Zn-Al-Mg-Cu)
mineral (refined metal)
Sea Glass (specifically Frosted White)
Amorphous Silica (substance: Sodium-calcium silicate glass)
Mineraloid (Anthropogenic/Man-made rock)
Hematite
Iron(III) oxide (Fe2O3)
mineral
Opalite (a synthetic glass)
Silicon Dioxide (SiO2) with various additives; not a true mineral but a man-made gem simulant
Mineral Simulant (Synthetic Glass)
Pyrite in Quartz (Drill Core)
Silicon Dioxide (SiO2) with Iron Sulfide (FeS2) inclusions
igneous/metamorphic (hydrothermal)
Sea Glass
Man-made vitreous material (silica-based glass)
mineral
Asphalt (Bituminous Pavement)
Bituminous mix (Aggregates with Bitumen binder)
sedimentary
Moldavite
Tektite (Impact Glass), ~80% SiO2 + Al2O3
tektite
Aura Quartz (Rainbow Quartz)
Silicon Dioxide (SiO2) with metallic vapor coatings
mineral
Opalite
Synthetic glass / Opalized glass
gemstone
Asphalt Chunk (Bituminous Concrete)
Aggregated Bitumen / Artificial Breccia
sedimentary
Ferrous Slag
Iron/Steel Slag (Complex Calcium-Alumino-Silicates)
Anthropgenic (Industrial Byproduct)
Chert Arrowhead
Cryptocrystalline Quartz (SiO2)
sedimentary
Carborundum (Silicon Carbide)
Silicon carbide (SiC)
mineral
Crescent Pebble
Weathered Quartzite or Sandstone Fragment
sedimentary
Eroded Brick or Pumice-like Scoria
Vesicular Basalt / Scoria (Anthropogenic variant: Eroded Firebrick)
igneous
Diamond
Native Carbon (C)
gemstone
Asphalt Chunk
Asphalt concrete
man-made composite
Opalite
Synthetic Glass (Hydrated Silica Simulant)
mineral
Bismuth Crystal
Bismuth (Bi)
mineral
Glass / Silicon Dioxide (Man-made)
SiO2 (Amorphous Silicon Dioxide)
Amorphous Solid
Aura Quartz (Pink/Rose Aura Quartz)
Silicon Dioxide (SiO2) bonded with Platinum and/or Silver
mineral
Silicon Carbide (Carborundum)
Silicon Carbide (SiC)
mineral
Likely tumbled or cut quartz/chalcedony fragment
Silicon dioxide (SiO₂), probably microcrystalline quartz or quartz
mineral
Mother of Pearl (Nacre)
Aragonite (CaCO3) with Organic Matrix
mineral
Chert Concretion
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Labradorite
Labradorite ((Ca, Na)(Al, Si)4O8)
mineral
Cultured Marble (Synthetic)
Polymer-matrix composite (typically calcium carbonate in polyester resin)
Synthetic / Composite Material
Opalite
Synthetic glass / Opaque silicious glass
gemstone
Carved Mottled Greenish-Yellow Crystal/Glass Object
Unknown; possibly a form of quartz (chalcedony/jadeite/nephrite) or glass/resin.
Man-made Object/Uncertain Mineral
Blue Sea Glass
Amorphous Silica (Anthropogenic glass)
not a rock (man-made origin)
Blue Obsidian
Volcanic Glass (SiO2 with inclusions)
igneous
Opalite
Man-made Synthetic Glass (Silicon Dioxide with metal additives)
mineral
Weathered iron-rich concretion or ironstone nodule
Goethite–hematite limonite concretion (FeO(OH), Fe₂O₃, and hydrated iron oxides)
sedimentary
Aura Quartz
Titanium-coated Silicon Dioxide (SiO2)
mineral
Opalite
Man-made glass (traditionally simulated Opal)
mineral
Bouncy Ball (Synthetic Rubber Polymer)
Polybutadiene / Ethylene Vinyl Acetate (EVA)
Synthetic material (Not a rock or mineral)