Blue opalite glass cabochon (likely imitation opal)
Man-made opalescent glass; not a natural mineral
gemstone
Category
Man Made Material (Jewelry, Metal Alloy)
Browse man made material (jewelry, metal alloy) specimens identified by the Rock Identifier community.
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Unidentifiable Rock Fragment
Uncertain
Asphalt Concrete (Bituminous Conglomerate)
Anthropogenic Bituminous Conglomerate
sedimentary
Opalite
Man-made glass (traditionally simulated Opal)
mineral
Concrete with Aggregate
Artificial Conglomerate (Cement and Aggregate)
sedimentary
Ferrochrome Slag
Calcium-Aluminium-Magnesium Silicate Slag
industrial byproduct
Blue slag glass / industrial smelter slag
Man-made iron-rich silicate slag; composition variable, commonly Fe–Ca–Mg–Al silicates with glassy phases
mineral
Opalite
Synthetic glass (SiO2 + impurities)
mineral
Blue cabochon, likely dyed or synthetic material
Undetermined; possibly dyed chalcedony (SiO₂), glass, or synthetic corundum
gemstone
Sea Glass
Man-made silicate glass
sedimentary
Diamond ring
Diamond, crystalline carbon (C)
gemstone
Polished opalite (likely man-made opalescent glass)
Opalite is a commercial name, not a mineral; typically opalescent glass, often soda-lime silicate glass
mineral
Carnelian cabochon
Orange-red variety of chalcedony (microcrystalline quartz), SiO₂
gemstone
Sea Glass
Man-made silicate glass
sedimentary
Sea Glass
Man-made silicate glass
gemstone
Sea Glass
Man-made silicate glass
mineral
Sea Glass
Man-made silicate glass
sedimentary
Goldstone
Avventurina (Man-made Glass with Copper inclusions)
mineral
ABS Plastic (Acrylonitrile Butadiene Styrene)
(C8H8)x·(C4H6)y·(C3H3N)z
Synthetic Polymer (Synthetic Material)
Concrete fragment with Aggregate
Anthropogenic Concrete with Calcarious and Siliceous Aggregate
sedimentary (anthropogenic/man-made)
Asphalt Concrete (Bituminous Pavement)
Aggregates in Bitumen Matrix
Technogenic / Anthropogenic Pavement Material
Sea Glass
Man-made silicate glass
mineral
Silver (Sterling Silver)
Argentum (Ag) mixed with Copper (Cu); Formula: Ag+Cu
mineral
Sea Glass
Man-made silicate glass
mineral
Sea Glass
Man-made silicate glass
mineral
Sea Glass
Man-made silicate glass
sedimentary
Diamond
Native Carbon (C)
gemstone
Asphalt (Road Aggregate)
Asphalt concrete / Bituminous mixture
anthropogenic sedimentary (technolith)
Tumbled milky quartz
Quartz (SiO₂), cryptocrystalline-to-massive variety
mineral
Sea Glass
Man-made silicate glass
mineral
Black onyx bead necklace
Black chalcedony, a microcrystalline quartz variety (SiO₂); beads may be dyed or treated
gemstone
Sea Glass
Amorphous silicon dioxide
mineral
Aggregate Concrete
Anthropogenic Conglomerate (Technosol)
sedimentary
Decorative gemstone bracelet or jewelry
Unidentifiable from the blurred image; likely colored glass or synthetic stones, possibly mixed gemstone beads
gemstone
Concrete / Anthropogenic Conglomerate
Man-made composite material (Portland cement, aggregate, and water)
not a natural rock
Red glassy gemstone, possibly garnet
Unidentified red transparent material; garnet group (X₃Y₂(SiO₄)₃) is a possibility
gemstone
Green cabochon gemstone, likely aventurine or dyed chalcedony
Indeterminate from image; possible quartz variety (SiO₂), including aventurine quartz or chalcedony
gemstone
Diamond-set gold ring
Diamond (carbon, C) in a gold-alloy setting; the stone may be a diamond or a diamond simulant
gemstone
Terrazzo (Man-made Composite)
Cementitious or Resin-bound Lithic Composite
sedimentary (artificial)
Blue cabochon gemstone, likely synthetic glass or dyed stone
Indeterminate from image; possible glass, synthetic spinel, sodalite, or lapis lazuli
gemstone
Sea Glass
Man-made vitreous material (silica-based glass)
mineral
Faceted gemstone in a jewelry setting
Indeterminate from image; likely quartz, cubic zirconia, or another transparent faceted stone
gemstone