Basalt
Extrusive Igneous Rock
igneous
Category
Mineral (Man Made Composite)
Browse mineral (man made composite) specimens identified by the Rock Identifier community.
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Polished agate or chalcedony cabochon
Microcrystalline quartz (SiO₂), likely pale chalcedony/agate
gemstone
Unakite
Epidotized Granite
metamorphic
Diamond
Carbon (C)
mineral
Diamond (Colorless/White)
Carbon (C)
mineral
Synthetic Zinc/Polycarbonate Composite (Bey-specimen)
Zinc Alloy (Zamak 3) with Polycarbonate (C15H16O2)n Overlay
Anthropogenic Mineral Mimic
Blue Goldstone
Aventurine glass (Synthetic borosilicate glass with cobalt and metallic inclusions)
man-made glass
Diamond
Carbon (C)
mineral
Diamond (in a jewelry setting)
Carbon (C)
mineral
Asphalt (Bituminous Pavement Bit)
Bitumen-bound aggregate (Petrochemical-bound composite)
sedimentary (anthropogenic/technogenic)
Corundum (Ruby variety)
Aluminium oxide (Al2O3)
mineral
Asphalt (Aggregate)
Bituminous macadam / Concrete Aggregate
sedimentary
Gastly (Trick or Trade Halloween Series)
Cellulose-carbonaceous composite (Lignocellulose laminated with pigmentary polymers)
Mineral (Synthetic - Paper and Ink Polymorph)
Blue Slag Glass
Amorphous Silica (Byproduct of smelting)
Antropogenic (Man-made)
Unakite
Altered Granite (Epidotized Granite)
metamorphic
Blue Chalcedony Cube
Silicon Dioxide (SiO2)
mineral
Diamond
Native Carbon (C)
mineral
Polymictic breccia, possibly volcanic breccia
Polymictic clastic breccia; likely a matrix-supported breccia containing lithic fragments, quartz, feldspar, and dark mafic minerals
sedimentary
Fossil Sea Urchin (Echinoid)
Echinoidea fossil (often replaced by silica or calcite)
fossil
Corundum (Sapphire/Ruby in Matrix)
Corundum (Al2O3)
mineral
Polished tiger iron
Tiger iron; interlayered hematite–jasper–crocidolite/quartz rock
metamorphic
Unakite
Epidotized Granite
metamorphic
Green Aura Quartz
Silicon Dioxide (SiO2) bonded with metallic vapors (typically Gold, Chromium, or Titanium)
mineral
Unakite
Unakite (Epidotized Granite)
metamorphic
Basalt
Basalt
Igneous
Black Obsidian
Obsidian (Volcanic Glass, SiO2 + impurities)
igneous
Slag Glass (Cullet)
Amorphous Silicon Dioxide (SiO2) with metal oxide colorants
Anthropogenic (Man-made)
Diamond (as set in a gold ring)
Carbon (C)
mineral
Turquoise
Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O
mineral
Unakite
Altered Granite (Granitic Metamorphic Rock)
metamorphic
Rough Diamond
Native Carbon (C)
mineral
Diamond (in a cluster setting)
Crystallized Carbon (C)
mineral
Chrysocolla Cuprite
Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla) and Cu2O (Cuprite)
mineral composite
Note on Image Identification: Textile
N/A (Anthropogenic material)
not a rock
Turquoise cabochon
Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O
gemstone
Turquoise butterfly carving
Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O (carved; possibly stabilized or dyed)
gemstone
Sea Glass
Amorphous Silicon Dioxide (SiO2)
Mineral/Man-made
Basalt
Basalt
igneous
Polished Bloodstone (likely dyed agate/jasper)
Cryptocrystalline quartz, SiO₂; commonly chalcedony with iron-oxide inclusions
gemstone
Possible ironstone concretion or weathered mineral nodule
Iron-oxide-rich concretion, likely goethite/limonite; identification uncertain from the photo
sedimentary
Diamond
Diamond (pure native carbon, C)
mineral
Blue quartzite or blue aventurine glass-like aggregate
Quartzite, predominantly SiO₂ (identification uncertain from image)
metamorphic