Iron Slag (Industrial Byproduct)
Anthropogenic pyrometallurgical residue
mineral
Category
Industrial Byproduct (Often Mistaken For Obsidian Or Mineral)
Browse industrial byproduct (often mistaken for obsidian or mineral) specimens identified by the Rock Identifier community.
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Quartz Pebble (Iron-Stained)
Crystalline Silicon Dioxide (SiO2)
mineral
Fluorite
Calcium fluoride (CaF2)
mineral
Silicon Carbide (Carborundum)
Silicon Carbide (SiC)
mineral
Yellow Quartz
SiO2
mineral
Chrysocolla-bearing copper ore
Chrysocolla (hydrated copper aluminosilicate), commonly with malachite and quartz/matrix
mineral
Ferrochrome Slag
Calcium-Aluminium-Magnesium Silicate Slag
industrial byproduct
Obsidian
Obsidian (Volcanic Glass)
igneous
Yellow or Honey Quartz
Silicon Dioxide (SiO2)
mineral
Likely obsidian (black volcanic glass)
Obsidian; predominantly rhyolitic volcanic glass, often ~70–75% SiO₂
igneous
Slag
industrial by-product
Aluminum Slag
Anthropogenic Aluminum (Al)
mineral
Opalite
Man-made glass (traditionally simulated Opal)
mineral
Fluorite (left), Sodalite (middle), Dumortierite/Tumbled Quartzite (right)
Calcium Fluoride (CaF2), Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2), Aluminum Borosilicate (Al7(BO3)(SiO4)3O3)
mineral
Aqua Aura Quartz
Silicon Dioxide (SiO2) bonded with Gold (Au)
mineral (treated)
Concretionary Sandstone
Clastic Sedimentary Rock (Sandstone with secondary mineral cementation)
sedimentary
Ironstone (Limonite/Hematite)
Ferruginous sedimentary rock (Fe2O3·nH2O / Fe2O3)
sedimentary
Basalt or Slag
Extrusive Igneous Rock / Industrial Slag
igneous
Slag (Industrial Glass/Byproduct)
Anthropogenic Vitreous Silicate
igneous (anthropogenic)
Green Glass (often marketed as 'Obsidian' or 'Green Quartz')
Amorphous Silica (SiO2) with copper or chromium additives
Mineraloid (Man-made)
Chalcanthite
Hydrated copper(II) sulfate (CuSO4·5H2O)
mineral
Garnet (Pyrope-Almandine series)
Garnet Group, (Mg,Fe)3Al2Si3O12
mineral
Cobalt Glass Slug (Cullet)
Man-made Silicate Glass with Cobalt Oxide (CoO)
mineraloid
Rounded metallic-looking pebble, likely iron-rich rock or slag
Uncertain; possible limonite/goethite-rich ironstone, hematite-bearing material, or industrial slag
mineral
Fluorite, Sodalite, and Rose Quartz collection
Calcium Fluoride (CaF2), Sodium Aluminum Silicate with Chlorine (Na8(Al6Si6O24)Cl2), Silicon Dioxide (SiO2)
mineral
Bismuth
Bismuth (Bi)
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Howlite
Howlite — Ca₂B₅SiO₉(OH)₅
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Milky Quartz with Dendritic Inclusions
Silicon Dioxide (SiO2)
mineral
Gold
Native Gold (Au)
mineral
Osumilite in Granite Matrix
(K,Na)(Fe,Mg)2(Al,Fe)3(Si,Al)12O30
mineral
Asphalt (Bituminous Concrete)
Asphaltum / Bitumen-Aggregate Matrix
Technonatural composite (often containing sedimentary/igneous aggregate)
Polished black stone, likely obsidian
Volcanic glass (primarily SiO₂), probably black obsidian
igneous
Vesicular Basalt with Oxidized Crust
Vesicular Basalt (Iron-rich extrusive volcanic rock)
igneous
Black glassy fragment, likely obsidian or industrial glass
Volcanic glass (obsidian), chiefly amorphous SiO₂; identification uncertain from image
mineral
Tiffany Stone
Bertrandite (with Fluorite, Opal, and Chalcedony), Be4Si2O7(OH)2
mineral
Silicon (Industrial Grade)
Elemental Silicon (Si)
mineral
Glass
Amorphous Silicon Dioxide (SiO2)
mineraloid
Tektite (Indochinite)
Tektite (Silica-rich natural glass)
mineral
Obsidian
Obsidian (Volcanic Glass)
igneous