Rock Identifier

Category

Mineraloid (Industrial Byproduct)

Browse mineraloid (industrial byproduct) specimens identified by the Rock Identifier community.

Green Glass (often marketed as 'Obsidian' or 'Green Quartz') (Amorphous Silica (SiO2) with copper or chromium additives) — Mineraloid (Man-made)

Green Glass (often marketed as 'Obsidian' or 'Green Quartz')

Amorphous Silica (SiO2) with copper or chromium additives

Mineraloid (Man-made)

Synthetic Resin / Plastic Figurine (Synthetic Polymer (Copolymer of Polyethylene or Resin)) — Mineraloid-like Synthetic Material

Synthetic Resin / Plastic Figurine

Synthetic Polymer (Copolymer of Polyethylene or Resin)

Mineraloid-like Synthetic Material

Chalcedony (or a variety of Chalcedony, likely Agate or Jasper) (Chalcedony (SiO₂)) — Mineral (or mineraloid if microcrystalline)

Chalcedony (or a variety of Chalcedony, likely Agate or Jasper)

Chalcedony (SiO₂)

Mineral (or mineraloid if microcrystalline)

Cullet Glass (Industrial Slag Glass) (Amorphous Silica (SiO2) with metallic oxide impurities) — Man-made byproduct (often mistaken for Obsidian or Emerald)

Cullet Glass (Industrial Slag Glass)

Amorphous Silica (SiO2) with metallic oxide impurities

Man-made byproduct (often mistaken for Obsidian or Emerald)

Slag — industrial by-product

Slag

industrial by-product

Slag (Industrial) (N/A (Anthropogenic Slag)) — industrial by-product

Slag (Industrial)

N/A (Anthropogenic Slag)

industrial by-product

Smelter Slag (Anthropogenic Silicate Slag) — igneous

Smelter Slag

Anthropogenic Silicate Slag

Likely iron-rich slag or weathered ironstone (Hematite–goethite-rich material (Fe₂O₃/FeO(OH)); possibly industrial iron slag) — mineral

Likely iron-rich slag or weathered ironstone

Hematite–goethite-rich material (Fe₂O₃/FeO(OH)); possibly industrial iron slag

Blue slag-like mineral specimen, possibly bornite or chalcopyrite (Tentatively bornite (Cu5FeS4) or iridescent chalcopyrite (CuFeS2)) — mineral

Blue slag-like mineral specimen, possibly bornite or chalcopyrite

Tentatively bornite (Cu5FeS4) or iridescent chalcopyrite (CuFeS2)

Carborundum (Silicon Carbide) (Silicon carbide (SiC)) — mineral

Carborundum (Silicon Carbide)

Silicon carbide (SiC)

Slag (Industrial By-product) (Anthropogenic Vitreous Silica/Iron Silicate) — mineral

Slag (Industrial By-product)

Anthropogenic Vitreous Silica/Iron Silicate

Likely iron-rich rock or weathered metallic mineral fragment (Uncertain; possibly limonite/goethite or iron-bearing slag) — mineral

Likely iron-rich rock or weathered metallic mineral fragment

Uncertain; possibly limonite/goethite or iron-bearing slag

Possible meteorite fragment (Undetermined; likely an iron-rich meteorite or meteorite-like slag fragment) — meteorite

Possible meteorite fragment

Undetermined; likely an iron-rich meteorite or meteorite-like slag fragment

Iron Slag (Anthropogenic Ferro-silicate) — mineral

Iron Slag

Anthropogenic Ferro-silicate

Weathered brown rock fragment, possibly iron-rich sandstone or altered basalt (Indeterminate; likely an iron-oxide–stained silicate rock) — igneous

Weathered brown rock fragment, possibly iron-rich sandstone or altered basalt

Indeterminate; likely an iron-oxide–stained silicate rock

Rounded river pebble (likely weathered granite or metamorphic rock) (Indeterminate; possible granitic or quartz-rich lithology) — igneous

Rounded river pebble (likely weathered granite or metamorphic rock)

Indeterminate; possible granitic or quartz-rich lithology

Weathered greenish rock fragment (Indeterminate; possibly epidote- or chlorite-bearing altered silicate rock) — mineral

Weathered greenish rock fragment

Indeterminate; possibly epidote- or chlorite-bearing altered silicate rock

Graphite Schist (C (Carbonaceous Schist)) — metamorphic

Graphite Schist

C (Carbonaceous Schist)

Rounded iron-rich pebble (Likely ferruginous sandstone or ironstone; exact identification requires testing) — sedimentary

Rounded iron-rich pebble

Likely ferruginous sandstone or ironstone; exact identification requires testing

Osumilite in Granite Matrix ((K,Na)(Fe,Mg)2(Al,Fe)3(Si,Al)12O30) — mineral

Osumilite in Granite Matrix

(K,Na)(Fe,Mg)2(Al,Fe)3(Si,Al)12O30

Tumbled purple rock, likely lepidolite-bearing mica schist (Lepidolite-rich mica schist; lepidolite K(Li,Al)₃(Si,Al)₄O₁₀(F,OH)₂, possibly mixed with quartz and feldspar) — metamorphic

Tumbled purple rock, likely lepidolite-bearing mica schist

Lepidolite-rich mica schist; lepidolite K(Li,Al)₃(Si,Al)₄O₁₀(F,OH)₂, possibly mixed with quartz and feldspar

Blue-green raw mineral specimen, likely apatite (Fluorapatite, Ca₅(PO₄)₃F (probable; visual identification only)) — mineral

Blue-green raw mineral specimen, likely apatite

Fluorapatite, Ca₅(PO₄)₃F (probable; visual identification only)

Chrysoprase- or serpentine-bearing quartz vein with pyrite (Quartz (SiO₂) with iron sulfide, chiefly pyrite (FeS₂), in altered Mg-rich rock; green material may be serpentine or nickel-bearing chalcedony) — mineral

Chrysoprase- or serpentine-bearing quartz vein with pyrite

Quartz (SiO₂) with iron sulfide, chiefly pyrite (FeS₂), in altered Mg-rich rock; green material may be serpentine or nickel-bearing chalcedony