Vesicular basalt (probable iron-rich volcanic rock)
Basalt; chiefly plagioclase, clinopyroxene, olivine, and Fe-Ti oxides
igneous
Category
Man Made Alloy (Metallic)
Browse man made alloy (metallic) specimens identified by the Rock Identifier community.
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Dyed Aura Quartz
Silicon Dioxide (SiO2) with metallic coating
mineral
Goldstone (with Tiger's Eye and Quartz)
Aventurine glass (Synthetic SiO2 with Cu inclusions)
mineral
Goldstone (Brown/Gold variety)
Aventurine Glass (SiO2 with Copper inclusions)
Synthetic/Man-made glass (often mistaken for a mineral)
Rose Quartz and Cherry Quartz (Dyed Glass/Quartz)
Silicon Dioxide (SiO2) with inclusions/dye
gemstone
Opalite
Synthetic glass / Opaque silicious glass
gemstone
Opalite
Man-made opalescent glass
gemstone
Opalite
Man-made opalized glass
mineral
Sea Glass
Man-made silicate glass
gemstone
Slag Glass
Amorphous Silicate (Man-made)
industrial byproduct
Blue Goldstone
Goldstone (artificial glass)
Mineral (man-made glass, not natural)
Sea Glass
Man-made silicate glass
sedimentary
Sea Glass
Man-made vitreous material
mineral
Possible obsidian or slag glass
Volcanic glass, primarily SiO₂; alternatively industrial iron-rich glassy slag
igneous
Opalite
Synthetic Opalised Glass
mineraloid (synthetic)
Iron meteorite (likely an etched or weathered display specimen)
Iron meteorite, composed chiefly of kamacite and taenite (Fe–Ni alloys)
meteorite
Pyrite Concretion (Grapestone)
Iron Sulfide (FeS2) Concretion
sedimentary
Small pebble, likely limestone
Unidentified carbonate pebble, possibly micritic limestone (calcite, CaCO₃)
sedimentary
Fluorite (Polished Point/Tower)
Calcium Fluoride (CaF2)
mineral
Concrete Fragment
Artificial Conglomerate (Cement and Aggregate)
sedimentary
Diamond (or Simulant)
Carbon (C)
gemstone
Sea Glass
Silicon dioxide (mostly)
mineral
Blue crystal pendant (likely blue glass or synthetic crystal)
Not identifiable from the image; possibly synthetic quartz or glass, rather than a natural mineral
gemstone
Red Slag Glass
Amorphous Silica (Industrial byproduct with metallic oxide dopants)
Mineraloid / Industrial Byproduct
Quartz pebble (Quartztite fragment)
Silicon Dioxide (SiO2)
mineral
Cupronickel (on a 1981 Mexico 20 Pesos coin)
Copper-Nickel Alloy (Cu75Ni25)
mineral
Carborundum (Silicon Carbide)
Silicon Carbide (SiC) / Moissanite (natural form)
mineral
Cobalt Blue Glass / Cullet Glass
Silicon dioxide (Amorphous man-made glass)
mineral
Chert (Arrowheads)
Microcrystalline Quartz (SiO2)
sedimentary
Mystic Topaz
Aluminum Silicate Fluoride Hydroxide (Al2SiO4(F,OH)2) with metallic film coating
mineral
Iron Slag (Industrial Byproduct)
Anthropogenic Vitrification Product/Ferrous Slag
Mineral-like Industrial Smelting Waste
Iron Meteorite
Siderite (Iron-Nickel Alloy)
meteorite
Ferruginous Conglomerate (or Iron-Rich Concrete/Slag)
Clastic Sedimentary (Silicon Dioxide/Iron Oxide matrix)
sedimentary
Blue goldstone
Man-made aventurine glass containing metallic copper particles; not a natural mineral
mineral
Rainbow Hematite (Man-made/Treated)
Tumbled Hematite with Titanium/Anodized coating (Iron(III) oxide, Fe2O3)
mineral
Exposed Aggregate Concrete (Pea Gravel)
Concrete with Siliceous Alluvial Gravels
sedimentary (man-made conglomerate)
Concrete Fragment
Hardened Portland cement and mineral aggregate
sedimentary (anthropogenic)
Man-made Dyed Aura Quartz
Silicon Dioxide (SiO2) with metallic coating/dye
mineral
Opalite
Synthetic Opalite Glass / Opalized Glass
gemstone
Asphalt Concrete
Bituminous conglomerate
sedimentary
Bismuth crystal
Bismuth (Bi), synthetic laboratory-grown crystal
mineral
Green Obsidian Sphere (man-made glass)
Vitreous Silica with Chromium/Iron additives
mineralogical simulant