Opalite
Synthetic Opalised Glass
Category
Browse man made rock (technosol) specimens identified by the Rock Identifier community.
Opalite
Synthetic Opalised Glass
Slag
Metallurgical by-product
Asphalt (Bituminous Pavement)
Bituminous mix (Aggregates with Bitumen binder)
Bouncy Ball (Synthetic Rubber Polymer)
Polybutadiene / Ethylene Vinyl Acetate (EVA)
Sandstone (with concrete/human-made layer)
Clastic Sedimentary Rock (primarily Quartz/Feldspar grains)
Decorative mosaic cross containing mixed rock and glass fragments
Polychrome aggregate; likely quartz, feldspar, marble, granite, and assorted colored glass
Sea Glass
Silicon dioxide (mostly)
Weathered iron-rich concretion or ironstone nodule
Goethite–hematite limonite concretion (FeO(OH), Fe₂O₃, and hydrated iron oxides)
Sandstone (with man-made markings)
Arenite (composed primarily of Quartz, SiO2)
Sandstone (with Liesegang rings or joints)
Clastic Sedimentary Rock (primarily Quartz with Iron Oxide cement)
Quartz pebble (Quartztite fragment)
Silicon Dioxide (SiO2)
Clear quartz sphere
Quartz (silicon dioxide, SiO₂)
Pet Rock (Man-made Quartzite or Granite Cobble)
Silicon dioxide (SiO2) mixture; commonly composed of Quartz, Feldspar, and Mica
Asphalt Chunk (Bituminous Concrete)
Aggregated Bitumen / Artificial Breccia
Stainless Steel (Polished)
Ferrous Alloy containing Iron (Fe), Chromium (Cr), and Carbon (C)
Chert Concretion
Chert (Microcrystalline Quartz, SiO2)
Slag
Metallurgical Slag
Asphalt (Road Aggregate)
Bituminous Conglomerate / Asphalt Concrete
Cobalt Blue Glass / Cullet Glass
Silicon dioxide (Amorphous man-made glass)
Conglomerate
Conglomerate Rock (Paraconglomerate)
Opalite
Synthetic Opalite Glass
Pyrite in Quartz (Drill Core)
Silicon Dioxide (SiO2) with Iron Sulfide (FeS2) inclusions
Tumbled milky quartz pebble
Quartz (silicon dioxide, SiO₂)
Sandstone Anvil / Nutting Stone
Quartzose Sandstone (Sedimentary Rock)
Asphalt (Bituminous pavement)
Bituminous concrete / Asphalt
Opalite (Man-made Glass)
Synthetic Silicon Dioxide Glass (SiO2 + metal oxides)
Concrete
Anthropogenic Sedimentary Rock (Hydrated Calcium Silicate)
Polymer Clay (Mock Mineral)
Polyvinyl chloride (PVC) with plasticizers and pigment
Tumbled clear quartz (rock crystal)
Quartz, silicon dioxide (SiO₂)
Moldavite
Tektite (Impact Glass), ~80% SiO2 + Al2O3
Clear quartz tumbled stone
Quartz (silicon dioxide, SiO₂)
Polished black pebble, likely basalt
Basalt, a fine-grained mafic volcanic rock composed mainly of plagioclase feldspar and pyroxene, commonly with olivine
Possible obsidian or slag glass
Volcanic glass, primarily SiO₂; alternatively industrial iron-rich glassy slag
Quartzite (Engineered Stone)
Silicon Dioxide (SiO2) based synthetic composite
Opalite
Synthetic Opalite Glass / Opalized Glass
Rock crystal quartz fragments
Quartz (silicon dioxide, SiO₂)
Concrete with Exposed Aggregate
Anthropogenic conglomerate (Concrete)
Green Obsidian Sphere (man-made glass)
Vitreous Silica with Chromium/Iron additives
Polished dendritic agate or jasper
Microcrystalline quartz (SiO₂), likely chalcedony with iron/manganese dendrites
Iron Slag (Industrial Byproduct)
Anthropogenic Vitrification Product/Ferrous Slag
Mystic Topaz (Treated Quartz or Topaz)
Aluminum silicate fluoride hydroxide [Al2SiO4(F,OH)2] with thin-film metallic coating
Sandstone Concretion
Limonitic Sandstone Concretion