Diamond (in a cluster setting)
Crystallized Carbon (C)
mineral
Category
Not A Natural Rock (Man Made Composite)
Browse not a natural rock (man made composite) specimens identified by the Rock Identifier community.
Sandstone (Ferruginous)
Arenite (SiO2 with Fe2O3 inclusions)
sedimentary
Artificial Rock Face (Faux Rock)
Glass Fiber Reinforced Concrete (GFRC)
man-made/construction material
Sandstone
Arenite (variable SiO2 composition)
sedimentary
Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Diamond in Kimberlite
Diamond (C in Kimberlite)
igneous
Granite
Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)
igneous
Sandstone (likely Quartzose Sandstone)
Arenite
sedimentary
Asphalt (Aggregate)
Bituminous macadam / Concrete Aggregate
sedimentary
Unakite
Unakite (Altered Granite composed of Orthoclase KAlSi3O8, Epidote Ca2(Al, Fe)3(SiO4)3(OH), and Quartz SiO2)
metamorphic
Sandstone
Clastic sedimentary rock (Quartz arenite/Arkose)
sedimentary
Sandstone Concretion
Clastic Sedimentary Concretion (typically Quartz/Silica with Iron Oxide)
sedimentary
Chalcanthite (Likely Synthetic/Lab-Grown)
Hydrated copper(II) sulfate (CuSO4·5H2O)
mineral
Green Slag
Anthropogenic Silicate Glass
Mineraloid (Industrial byproduct)
Titanium Aura Quartz (Aura Quartz)
Titanium-coated Silicon Dioxide (SiO2)
mineral
Glass Nugget (Tumbled Glass)
Amorphous Silicon Dioxide (SiO2) with additives
mineraloid (man-made)
Ceramic or Polished Stone Heart (Anthropogenic Material)
Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)
Synthetic/Anthropogenic Mineraloid
Bismuth
Bismuth (Bi)
mineral
Diamond (or Cubic Zirconia simulant)
Carbon (C) - Diamond / Zirconium dioxide (ZrO2) - CZ
mineral
Smoky Quartz Cluster
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Goldstone (Synthetic Aventurescence Glass)
Cuprous Aventurescent Glass (Silicon Dioxide with Copper inclusions)
mineraloid / man-made material
Ferrous Slag
Iron/Steel Slag (Complex Calcium-Alumino-Silicates)
Anthropgenic (Industrial Byproduct)
Banded Sandstone
Arenite with Liesegang banding
sedimentary
Asphalt (Bituminous Concrete)
Asphaltum / Bitumen-Aggregate Matrix
Technonatural composite (often containing sedimentary/igneous aggregate)
Glass
Amorphous Silicon Dioxide (SiO2)
mineraloid
Turquoise
Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O
mineral
Green Sea Glass
Amorphous Silica (man-made glass), SiO2 + additive metal oxides
mineraloid / anthropogenic (man-made origin)
Labradorite
Labradorite ((Ca, Na)(Al, Si)4O8)
mineral
Graphite
Graphite (Native Carbon, C)
metamorphic
Diamond
Diamond (pure Carbon, C)
mineral
Fluorite (Polished Point/Tower)
Calcium Fluoride (CaF2)
mineral
Chalk
Micrite (primarily Calcium Carbonate, CaCO3)
sedimentary
Man-made Green Quartz (Lab-grown or Treated)
Silicon Dioxide (SiO2) with artificial coloration
mineral
Green Agate
Silicon dioxide (SiO₂)
mineral
Ferrochrome Slag
Anthropogenic slag (Fe-Cr alloy waste)
industrial byproduct
Slag
Ferrous Slag (Siliceous industrial waste)
Anthropogenic (Man-made industrial byproduct)
Unakite
Epidotized Granite
metamorphic
Moissanite
Silicon Carbide (SiC)
mineral
Carborundum (Silicon Carbide)
Silicon Carbide (SiC)
mineral (synthetic)
Diamond
Carbon (C)
mineral
Rough Corundum (Sapphire/Ruby mixture)
Corundum (Aluminum Oxide, Al2O3)
mineral
Diamond (Colorless/White)
Carbon (C)
mineral