Sandstone (with man-made markings)
Arenite (composed primarily of Quartz, SiO2)
sedimentary
Category
Man Made Material
Browse man made material specimens identified by the Rock Identifier community.
Learn about Man Made Material in the encyclopedia
View all →
Slag Glass (Leland Blue variant)
Anthropogenic Vitreous Silicate
mineral
Aventurine
Quartz containing inclusions of Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
metamorphic
Pet Rock (Man-made Quartzite or Granite Cobble)
Silicon dioxide (SiO2) mixture; commonly composed of Quartz, Feldspar, and Mica
igneous or metamorphic (base stone); anthropogenic (decoration)
Chert (Flint)
Silicon dioxide (SiO2)
sedimentary
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
mineral
Cubic Zirconia (Man-made)
Cubic Zirconia (ZrO2) with Enamel and Metal Alloy
mineral
Man-made Jewelry (Metal and Glass/Plastic)
Synthetic Alloy and Amorphous Solid (SiO2/Polymer)
not a rock
Slate
Metamorphic Pelitic Rock
metamorphic
Dyed Dragon Vein Agate
Silicon Dioxide (SiO2) with artificial pigment
mineral
Dyed Crackle Quartz
Silicon Dioxide (SiO2) with synthetic dye
mineral
Polished blue calcite sphere (tentative identification)
Calcite, CaCO₃; blue color generally results from trace impurities or inclusions
mineral
Coquina
Bioclastic Limestone
sedimentary
Libyan Desert Glass
Impact-melt silica glass (SiO2 + traces of Al, Fe, Ti)
mineral (Tektite/Impactite)
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Blue Goldstone
Synthetic Aventurescent Glass (Cobalt-doped soda-lime glass)
man-made glass
Chert (White Chert/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (variations include Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Sea Glass
Amorphous Silicon Dioxide (Man-made glass weathered by nature)
mineral
Titanium Aura Quartz (Aura Quartz)
Titanium-coated Silicon Dioxide (SiO2)
mineral
Chert (Arrowhead/Artifact Fragment)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Diamond
Native Carbon (C)
gemstone
Blue Goldstone
Aventurine Glass (SiO2 with Cobalt/Copper inclusions)
man-made glass
Terracotta (Man-made ceramic brick fragment)
Baked clay / High-iron ceramic (Silicate-based ceramic)
Anthropogenic material (Man-made sedimentary mimic)
Moissanite
Silicon Carbide (SiC)
mineral
Coquina
Bioclastic Limestone
sedimentary
Ruby in Matrix
Corundum (Al2O3)
mineral
Slate
Metamorphic Pelitic Rock
metamorphic
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Chert or Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Sea Glass
Amorphous silicon dioxide (Man-made glass weathered by nature)
mineral
Dyed Quartz Geode
Silicon Dioxide (SiO2) with artificial pigment
mineral
Limpets Shell / Fossil Specimen
Patellogastropoda (Class)
fossil
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (specifically Tan/Gray Chert)
Microcrystalline quartz (SiO2)
sedimentary
Chert (varietal: Flint/Jasper)
Silicon Dioxide (SiO2)
sedimentary
Chert (specifically Flint Arrowhead)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Pink Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Hematite Beads
Hematite (Fe2O3)
Mineral
Nephrite Jade
Nephrite
Mineral/Rock
Tumbled chalcedony (likely moss or dendritic agate)
Microcrystalline quartz, SiO₂, with iron-oxide inclusions
mineral
Diamond
Carbon (C)
gemstone