Opalite
Synthetic glass / Opalized glass
gemstone
Category
Man Made Byproduct (Often Mistaken For Obsidian Or Emerald)
Browse man made byproduct (often mistaken for obsidian or emerald) specimens identified by the Rock Identifier community.
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Blue Slag Glass
Amorphous Silica (Byproduct of smelting)
Antropogenic (Man-made)
Aura Quartz (Pink/Rose Aura Quartz)
Silicon Dioxide (SiO2) bonded with Platinum and/or Silver
mineral
Opalite
Synthetic glass (SiO2 + metal additions)
mineraloid
Opalite
Man-made synthetic glass with opalescent effects (SiO2 + metal oxides)
mineraloid
Polished black stone, likely black obsidian
Obsidian (volcanic glass), chiefly silica-rich rhyolitic composition
igneous
Opalite
Man-made Glass (SiO2 + additives)
mineraloid (synthetic)
Iron Slag
Anthropogenic Iron Silicate
industrial byproduct
Glass Nugget (Tumbled Glass)
Amorphous Silicon Dioxide (SiO2) with additives
mineraloid (man-made)
Iron Slag
Anthropogenic pyrometallurgical byproduct
igneous
Polished black stone, likely obsidian
Obsidian (volcanic glass; mostly silica-rich rhyolitic composition)
igneous
Black Obsidian
Amorphous volcanic glass (SiO2 + impurities)
igneous
Green glassy mineral specimen, likely rough emerald or green fluorite
Tentatively beryl (Be₃Al₂Si₆O₁₈), emerald variety; synthetic/man-made glass cannot be excluded from the photograph
mineral
Iron Slag
Anthropogenic Ferro-silicate
mineral
Ferrochrome Slag
Anthropogenic silicate/oxide glass (Complex silicate matrix with Cr-Fe-Si inclusions)
Industrial byproduct (often confused with igneous rocks or meteorites)
Diamond (or Simulant)
Carbon (C) or relevant simulant formula (e.g., ZrO2 for Cubic Zirconia)
gemstone
Glass / Silicon Dioxide (Man-made)
SiO2 (Amorphous Silicon Dioxide)
Amorphous Solid
Tumbled black stone, likely black obsidian
Obsidian; volcanic glass, typically rhyolitic composition (SiO₂-rich)
igneous
Iron Slag
Ferrous Slag (Silicate/Oxide mixture)
industrial byproduct (anthropogenic)
Iron Slag
Ferrous Slag (Industrial Byproduct)
mineraloid (anthropogenic byproduct)
Crushed Stone (Likely Limestone or Granite)
Calcium Carbonate (CaCO3) for Limestone / Quartz and Feldspar for Granite
sedimentary or igneous
Green Tourmaline
Elbaite (Na(Li,Al)3Al6(BO3)3Si6O18(OH)4)
mineral
Iron Slag
Anthropogenic Vitreous Silicate (Byproduct of Smelting)
Mineral-like byproduct
Sandstone Concretion
Sedimentary concretion
Sedimentary
Polished black stone, likely black obsidian
Volcanic glass; predominantly rhyolitic silica glass (SiO₂-rich)
igneous
Polished black pebble, possibly obsidian
Volcanic glass (obsidian), likely; identification is tentative from the image
igneous
Iron Slag
Anthropogenic pyrometallurgical residue
industrial byproduct
Green glass sphere/marble
Soda-lime glass (primarily SiO2, Na2O, CaO)
Man-made object (Simulant)
Blue Slag Glass
Amorphous Silica (Industrial byproduct)
Antropogenic (Man-made glass byproduct)
Opalite
Synthetic glass (SiO2 + impurities)
mineral
Costume Jewelry with Synthetic Gemstones
Synthetic Cubic Zirconia and Glass (SiO2 / ZrO2)
mineral
Concrete Fragment
Artificial Conglomerate (Cement and Aggregate)
sedimentary
Carborundum
Silicon Carbide (SiC)
mineral
Rose Quartz and Cherry Quartz (Dyed Glass/Quartz)
Silicon Dioxide (SiO2) with inclusions/dye
gemstone
Tumbled Clear Quartz/Rock Crystal
Silicon Dioxide (SiO2)
mineral
Opalite
Synthetic glass / Opaque silicious glass
gemstone
Sea Glass
Man-made silicate glass
gemstone
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (mica)
Mineral (variety of Quartz)
Polished silver sheen obsidian heart
Obsidian (volcanic glass), primarily rhyolitic silica-rich glass
igneous
Chrysoprase
Silicon dioxide (SiO2) with nickel impurities
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Slag
Anthropogenic Iron Silicate Glass
mineral