Asphalt (Bituminous Concrete)
Bituminous mix / Anthropogenic conglomerate
man-made composite (lithified equivalent of sedimentary)
Category
Mineral (Man Made Glass, Not Natural)
Browse mineral (man made glass, not natural) specimens identified by the Rock Identifier community.
Learn about Mineral (Man Made Glass, Not Natural) in the encyclopedia
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Smoky Quartz
Silicon Dioxide (SiO2) with aluminum impurities
mineral
Polished blue stone, likely sodalite or dyed agate
Sodalite: Na₈(Al₆Si₆O₂₄)Cl₂; exact identification requires testing
mineral
Pearl
Aragonite (CaCO3 with conchiolin)
mineral
Synthetic Faux Fur Fursuit
Polyacrylonitrile / Polyester (Synthetic Textile)
not a rock (synthetic material/costume)
Nickel coin (U.S. currency)
Cupronickel (75% Copper, 25% Nickel alloy)
man-made alloy (metallic)
Diamond
Carbon (C)
gemstone
Sandstone
Clastic Sedimentary Rock
sedimentary
Rough Diamond
Diamond (Pure Carbon: C)
mineral
Prasiolite (Green Quartz) / Sea Glass Amalgam
SiO2 (Silicon Dioxide)
mineral
Quartz (Yellow / Citrine Pebble)
Silicon Dioxide (SiO2)
mineral
Grey Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Green glass-like cabochon, likely synthetic glass or resin
Unidentified green transparent material; possibly molded glass, synthetic spinel, or resin
gemstone
Sandstone
Sandstone (SiO2-rich detrital sedimentary rock)
sedimentary
Amethyst
Amethyst (Silicon Dioxide, SiO2 + Fe4+ impurities)
mineral
Granodiorite
Granodiorite
Igneous
Dark gray rounded stone, possibly basalt or slag
Uncertain; likely fine-grained basalt (plagioclase–pyroxene) or iron-rich industrial slag
igneous
Titanium Aura Quartz
Titanium-coated Silicon Dioxide (SiO2)
mineral (man-enhanced)
Diamond
Carbon (C)
gemstone
Diamond
Carbon (C)
gemstone
Sandstone
Sedimentary Clastic Rock
sedimentary
Mother of Pearl (Nacre) / Shell Fragment
Biogenic Calcium Carbonate (Aragonite and Conchiolin)
fossil
Diamond (in jewelry setting)
Diamond (C - Carbon)
mineral
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Tektite
Natural impact glass
meteorite
Diamond (or Cubic Zirconia)
Carbon (C) or Zirconium Dioxide (ZrO2)
gemstone
Obsidian
Obsidian (volcanic glass, amorphous silica rich rock)
Igneous
Tumbled chalcedony (likely moss or dendritic agate)
Microcrystalline quartz, SiO₂, with iron-oxide inclusions
mineral
Blue Sapphire (likely costume glass imitation)
Corundum (Al2O3) with iron/titanium impurities
mineral
Yellow Quartz (or Citrine Quartz)
Silicon Dioxide (SiO2)
mineral
Asphalt
Asphalt concrete (engineered material, not a naturally occurring rock/mineral in this form)
Sedimentary
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Coquina / Fossiliferous Limestone
Coquina (composed primarily of Calcium Carbonate / CaCO3)
sedimentary
Diamond
Carbon (C)
gemstone
Dark rounded pebble, likely basalt or slag
Probable fine-grained mafic rock; possibly basalt (plagioclase–pyroxene) or industrial iron/steel slag
igneous
Native Silver
Silver (elemental Ag)
mineral
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Man-made Blank Ammunition (Brass)
CuZn (Cartridge Brass - roughly 70% Copper, 30% Zinc)
Anticrystalline / Synthetic Alloy
Tumbled blue glassy mineral, possibly sodalite or blue aventurine
Identification uncertain; likely sodalite (Na₈Al₆Si₆O₂₄Cl₂) or blue-dyed quartz/slag-like material
mineral
Yellow Quartz / Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Green cabochon gemstone pendant, likely turquoise or dyed green turquoise
Probably turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; exact identification requires testing
gemstone
Sandstone
Arenite (SiO2 based)
sedimentary