Slag
Ferrous Slag (Siliceous industrial waste)
Anthropogenic (Man-made industrial byproduct)
Category
Not A Natural Rock (Man Made Composite)
Browse not a natural rock (man made composite) specimens identified by the Rock Identifier community.
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Diamond
Carbon (C)
gemstone
Smoky Quartz
Silicon Dioxide (SiO2) with aluminum impurities
mineral
Opal (in Jewelry Setting)
Hydrated Silicon Dioxide (SiO2·nH2O)
gemstone
Sandstone (specifically Arkose or Quartz Arenite)
Arenite (primarily SiO2 with possible Feldspar)
sedimentary
Carborundum (Silicon Carbide)
Silicon Carbide (SiC)
mineral (synthetic)
Artisanal Glass Beads (Simulated Goldstone or Aventurine Glass)
Silicon Dioxide (SiO2) with metallic inclusions
man-made material
Fluorite (Polished Point/Tower)
Calcium Fluoride (CaF2)
mineral
Yooperlite (Syenite clast containing fluorescent Sodalite)
Sodalite-bearing Syenite
igneous
Polished black stone, likely black obsidian
Obsidian (volcanic glass), chiefly silica-rich rhyolitic composition
igneous
Pyrite Concretion (Grapestone)
Iron Sulfide (FeS2) Concretion
sedimentary
Green Agate
Silicon dioxide (SiO₂)
mineral
Dyed Blue Agate Slice
Silicon Dioxide (SiO2)
mineral
Coquina
Biogenic Limestone (CaCO3)
sedimentary
Iron Slag
Iron/Steel Slag (Ferrosilicate Glass)
industrial byproduct (anthropogenic material)
Agate (Dyed) or composite stone
SiO2
mineral
Slag Glass
SiO2 (Silicon Dioxide) with impurities
man-made glass
Unakite
Epidotized Granite
metamorphic
Sandstone (likely Fossiliferous)
Arenite / Fossiliferous Sandstone (SiO2 composition)
sedimentary
Blue Chalcedony Cube
Silicon Dioxide (SiO2)
mineral
Green Slag Glass
Cullet (Amorphous Silicon Dioxide with impurities)
Man-made rock-like material
Chert (Chalcedony/Agate)
Microcrystalline Quartz (SiO2)
sedimentary
Unakite
Altered Granite (Epidotized Granite)
metamorphic
Blue Slag Glass
Amorphous Silica (Byproduct of smelting)
Antropogenic (Man-made)
Blue Goldstone
Synthetic glass with copper or cobalt/manganese inclusions
man-made glass
Unakite
Altered granite (Epidote, Orthoclase Feldspar, and Quartz)
metamorphic
Sea Glass (White/Clear)
Amorphous Silica (Alkali-Lime-Silica Glass), SiO2 + Na2O + CaO
Anthropogenic (Man-made product subject to geological processes)
Black Obsidian
Amorphous volcanic glass (SiO2 + impurities)
igneous
Corundum (Ruby variety)
Aluminium oxide (Al2O3)
mineral
Diamond (as set in a gold ring)
Carbon (C)
mineral
Diamond (Cut Gemstone)
Carbon (C)
gemstone
Synthetic Marbled Aggregate (Footwear Component)
Ethylene-vinyl acetate (Croslite™)
not a rock (man-made polymer)
Goldstone
Not a natural mineral or rock. It is an ornamental glass.
Manufactured Glass (Simulant)
Coral Rock (Coquina)
Biogenic Limestone (Calcium Carbonate - CaCO3)
sedimentary
Sandstone (Pebble)
Sandstone (arenite, arkose, wacke depending on composition)
sedimentary
Unakite
Altered Granite (Granitic Metamorphic Rock)
metamorphic
Man-made Synthetic Material (Not a rock or mineral)
Polyester (Polyethylene terephthalate) / Faux Fur
Synthetic / Textile
Synthetic Resin (Artificial Specimen)
Polyurethane or Polyester Resin
mineraloid (man-made)
Diamond
Carbon (C)
gemstone
Rough Diamond
Native Carbon (C)
mineral
Sandstone
Arenite (composed primarily of Quartz: SiO2)
sedimentary
Likely blue glass or synthetic gemstone jewelry
Uncertain; possibly synthetic spinel, cubic zirconia, or blue glass
gemstone