Sea Glass
Man-made vitreous material (silica-based glass)
mineral
Category
Man Made
Browse man made specimens identified by the Rock Identifier community.
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Concrete Rubble with Aggregate
Hardened Portland Cement Paste with Coarse Aggregate
Anthropogenic (Man-made)
Obsidian
Volcanic glass
igneous
Concrete
Anthropogenic Conglomerate
sedimentary
Blue Goldstone
Man-made glass with crystalline copper/cobalt inclusions
mineral
Cobalt Glass Slug (Cullet)
Man-made Silicate Glass with Cobalt Oxide (CoO)
mineraloid
Opalite
Man-made opalescent glass (SiO2 + metal oxides)
mineral (synthetic)
Aura Quartz (Titanium Quartz)
Titanium-coated Silicon Dioxide (SiO2 + Ti)
mineral
Concretion (Sandstone)
Carbonate-cemented Sandstone Concretion
sedimentary
Slag
Anthropogenic Vitreous Silica/Iron oxides
mineral-like byproduct
Opalite
Synthetic Opalized Glass
gemstone
Opalite
Synthetic Glass (Amorphized Silicon Dioxide)
mineraloid
Asphalt Concrete (Bituminous Pavement)
Aggregates in Bitumen Matrix
Technogenic / Anthropogenic Pavement Material
Slag
Glassy silicate byproduct (anthropogenic material)
industrial byproduct
Opalite (Synthetic Moonstone/Opal)
Synthetic Silica Glass
mineraloid (synthetic)
Quartz (Engineered Stone Countertop)
Silicon Dioxide (SiO2) with polymer resins
Sedimentary-like (Industrial Composite)
Aluminum Slag
Anthropogenic Aluminum (Al)
mineral
Obsidian (likely black volcanic glass)
Obsidian; primarily amorphous volcanic silica glass, approximately SiO₂-rich rhyolitic composition
igneous
Goldstone (Brown/Gold)
Aventurine Glass (Man-made glass with Copper inclusions)
gemstone
Porcelain Tile (Sandstone-look)
Man-made Ceramic (resembling Quartz-rich Sandstone)
sedimentary (imitation)
Opalite crescent pendant
Opalite (man-made opalescent glass; not a natural mineral)
gemstone
Sea Glass
Man-made vitreous material (silica-based glass)
mineral
Sea Glass
Man-made silicate glass (Amorphous silicon dioxide)
mineral
Goldstone
Aventurine Glass (Man-made glass with copper inclusions)
mineraloid / man-made glass
Raw quartz crystal
Quartz (silicon dioxide, SiO₂), likely milky or included quartz
mineral
Rose Quartz and Cherry Quartz (Dyed Glass/Quartz)
Silicon Dioxide (SiO2) with inclusions/dye
gemstone
Blue Obsidian
Volcanic Glass (Silica, SiO2)
gemstone
Aura Quartz (specifically Titanium Aura Quartz)
Titanium-coated Silicon Dioxide (SiO2 + Ti Coating)
mineral
Likely clear quartz crystal or glass-like gemstone
Quartz, silicon dioxide (SiO₂); exact identification is uncertain from the strongly magenta-lit image
mineral
Polished obsidian
Volcanic glass; predominantly rhyolitic SiO₂
igneous
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
mineral
Titanium Aura Quartz
Titanium-coated Silicon Dioxide (SiO2)
gemstone
Asphalt Concrete
Bituminous Concrete (Anthropic Rock)
sedimentary
Chert (Chalky Flint Node)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Opalite
Synthetic Glass (SiO2 + impurities)
mineral
Opalite
Synthetic Glass (typically Silica/Magnesium based with metal additives)
mineral
Silicon Carbide (Carborundum)
Silicon Carbide (SiC) / Moissanite (natural)
mineral
Asphalt (Bituminous pavement)
Bituminous concrete / Asphalt
Sedimentary (Anthropogenic)
Titanium-Coated Hematite (Aura Hematite)
Titanium-bonded Hematite (Fe2O3 with a Ti coating)
mineral
Red glassy gemstone, possibly garnet
Unidentified red transparent material; garnet group (X₃Y₂(SiO₄)₃) is a possibility
gemstone
Blue Goldstone
Synthetic glass with cobalt and copper inclusions
man-made glass
Cubic Zirconia (Jewelry Setting)
Cubic Zirconia (ZrO2)
gemstone