Opalite
Synthetic Opalite Glass (Silicon Dioxide)
mineraloid (man-made)
Category
Man Made Material (Anthro Lithic Product)
Browse man made material (anthro lithic product) specimens identified by the Rock Identifier community.
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Chert (Yellow Jasper/Quartzite Pebble)
Microcrystalline Silicon Dioxide (SiO2)
sedimentary
Chert (Field-collected Arrowhead-shaped Fragment)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Green Agate
Silicon dioxide (SiO₂)
mineral
Cullet Glass (Man-made Glass Slag)
Amorphous Silica (SiO2) with chemical additives
Mineraloid
Chert (often called Flint in this context)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Green Glass (often marketed as 'Obsidian' or 'Green Quartz')
Amorphous Silica (SiO2) with copper or chromium additives
Mineraloid (Man-made)
Red Slag Glass
Amorphous Silica (Industrial byproduct with metallic oxide dopants)
Mineraloid / Industrial Byproduct
Aura Quartz
Titanium/Titanium-Gold treated Silicon Dioxide (SiO2)
mineral
Sandstone Concretion
Clastic sedimentary rock (primarily Quartz SiO2)
sedimentary
Conglomerate
Conglomerate Rock (Paraconglomerate)
sedimentary
Green Aventurine
Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Conglomerate (River Rock Aggregate)
Conglomerate (Lithic-clast conglomerate)
sedimentary
Chert (often found as Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone (Graywacke type)
Clastic Sedimentary Rock (Lithic Sandstone)
sedimentary
Slag (Industrial)
N/A (Anthropogenic Slag)
industrial by-product
Quartzite Pebble
Metamorphic Quartz (SiO2)
metamorphic
Sandstone (likely Graywacke or Arkose variant)
Clastic Sedimentary Rock (SiO2 based)
sedimentary
Cullet Glass (sometimes mistaken for Blue Obsidian or Slag)
Amorphous Silicon Dioxide (SiO2) with chemical additives (e.g., Cobalt for blue color)
mineraloid / industrial byproduct
Asphalt (Aggregate)
Bituminous macadam / Concrete Aggregate
sedimentary
Carborundum (Silicon Carbide)
Silicon Carbide (SiC) / Moissanite (natural form)
mineral
Man-made Crystal (Lead Glass)
Lead oxide-doped Silica Glass (approx. SiO2 + PbO)
Mineraloid/Synthetic Material
Quartz with Limonite Staining
Silicon Dioxide (SiO2) with Hydrated Iron Oxide (FeO(OH)·nH2O)
Mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Man-made earbud charging case (Not a rock or mineral)
Acrylonitrile Butadiene Styrene (ABS) Plastic with electronic components
Synthetic/Man-made object
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Diamond
Native Carbon (C)
mineral
Note on Image Identification: Textile
N/A (Anthropogenic material)
not a rock
Porcelain Tile (Sandstone-look)
Man-made Ceramic (resembling Quartz-rich Sandstone)
sedimentary (imitation)
Banded Iron Formation (BIF)
Banded Iron Formation (Magnetite-Hematite-Chert)
sedimentary
Iron Slag
Ferrous Slag (Silicate/Oxide mixture)
industrial byproduct (anthropogenic)
Slag (Industrial By-product)
Anthropogenic Vitreous Silica/Iron Silicate
mineral
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Chert (specifically Flint or Novaculite variant)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Aventurine
Quartz containing inclusions of Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
metamorphic
Gold (Elemental Metal)
Gold (Au)
Mineral
Clay (as a rock-forming material)
Clay minerals (e.g., Kaolinite group, Smectite group, Illite group, Chlorite group)
Mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (Lithic arenite / Quartz arenite)
sedimentary