Chert (Chalcedony/Agate)
Microcrystalline Quartz (SiO2)
Category
Browse man made rock like material specimens identified by the Rock Identifier community.
Chert (Chalcedony/Agate)
Microcrystalline Quartz (SiO2)
Synthetic Marbled Aggregate (Footwear Component)
Ethylene-vinyl acetate (Croslite™)
Cubic Zirconia (Man-made)
Cubic Zirconia (ZrO2) with Enamel and Metal Alloy
Slag
Ferrous Slag (Siliceous industrial waste)
Limpets Shell / Fossil Specimen
Patellogastropoda (Class)
Pink Granite
Phaneritic Felsic Igneous Rock (Granite)
Libyan Desert Glass
Tektite (high-silica impact glass), SiO2
Tektite
Impactite (Natural Silicate Glass)
Zinc Alloy (Silver-plated)
Zinc Alloy Casting (Zn-Al-Mg-Cu)
Opalite
Synthetic Opalised Glass
Sandstone Concretion
Clastic Sedimentary Concretion (typically Quartz/Silica with Iron Oxide)
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
Granite / Diorite (Granodiorite)
Granodiorite / Quartz Diorite
Chert
Microcrystalline Quartz (SiO2)
Basalt
Basalt
Weathered chert or chalcedony nodule
Microcrystalline quartz (SiO₂), possibly silicified limestone or agate-like chalcedony
Chert (Flint)
Silicon Dioxide (SiO2)
Diamond (in a gold ring)
Diamond (pure carbon, C)
Libyan Desert Glass
Libyan Desert Glass (SiO2 with trace elements)
Sea Glass
Amorphous silicon dioxide (SiO2) - Man-made glass tumbled by nature
Chert (specifically Flint Arrowhead)
Silicon dioxide (SiO2) - Microcrystalline Quartz
Sandstone (specifically Arkose or Quartz Arenite)
Arenite (primarily SiO2 with possible Feldspar)
Opalite
Synthetic Opalized Glass (SiO2 + additives)
Conglomeratic concrete or asphalt aggregate surface with dark bituminous chunks
Polymictic gravel aggregate; dark pieces likely bitumen/asphalt, not a natural rock
Blue glass-like tumbled specimen
Most likely cobalt-blue slag glass or manufactured glass; not confidently identifiable as a natural mineral from the image
Aqua Aura Quartz
Titanium/Gold-coated Silicon Dioxide (SiO2)
Diamond
Carbon (C)
Tumbled amber-colored chalcedony or jasper
Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper
Banded Calcite (often sold as 'Mexican Onyx' or 'Green Onyx')
Calcite (Calcium Carbonate, CaCO3)
Aura Quartz (Pink/Rose Aura Quartz)
Silicon Dioxide (SiO2) bonded with Platinum and/or Silver
Chert (Chert / Flint Variety)
Microcrystalline / Cryptocrystalline Quartz (SiO2)
Basalt
Basalt
Asphalt aggregate (crushed stone in bitumen)
Artificial composite; predominantly crushed granite, basalt, limestone, and/or recycled aggregate bound by bitumen
Chert
Silicon dioxide (SiO2)
Clay Brick
Ceramic structural unit (Al2O3·2SiO2·2H2O as precursor)
Chert (often called Flint in archaeological contexts)
Silicon Dioxide (SiO2)
Asphalt (Bituminous Concrete)
Bituminous Concrete / Pavement
Weathered iron-rich rock, possibly jasper or ironstone
Likely limonite/goethite-bearing siliceous rock; exact identification requires hardness and streak tests
Sandstone
Arenite (composed primarily of SiO2)
Cherry Quartz
SiO2 (Silicon Dioxide with iron-rich inclusions/dye)
Chert or Jasper
Microcrystalline Quartz (SiO2)
Blue Goldstone
Synthetic Aventurescent Glass (Cobalt-doped soda-lime glass)