Rock Identifier

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.

Learn about Industrial Byproduct (Often Mistaken For Obsidian Or Mineral) in the encyclopedia

Porphyritic Obsidian

Porphyritic Obsidian

Gray Obsidian

Red Obsidian

Starry Night Obsidian

Gold Sheen Obsidian

Pink Lady Obsidian

Anatase

Euxenite

Double Flow Obsidian

Aventurine

Black Shale

Peacock Ore

Obsidian (Volcanic Glass (predominantly SiO2 – Silicon Dioxide, but non-crystalline)) — Igneous

Obsidian

Volcanic Glass (predominantly SiO2 – Silicon Dioxide, but non-crystalline)

Tumbled obsidian (Volcanic glass; chiefly silica-rich rhyolitic glass (approximately 70–80% SiO₂)) — igneous

Tumbled obsidian

Volcanic glass; chiefly silica-rich rhyolitic glass (approximately 70–80% SiO₂)

Possible tektite or volcanic glass specimen (Natural silica glass; composition commonly near SiO₂, but exact identification requires chemical testing) — mineral

Possible tektite or volcanic glass specimen

Natural silica glass; composition commonly near SiO₂, but exact identification requires chemical testing

Likely polished/tumbled dark mineral or glassy rock fragment (Indeterminate from image; possibly hornblende, schorl tourmaline, or obsidian) — mineral

Likely polished/tumbled dark mineral or glassy rock fragment

Indeterminate from image; possibly hornblende, schorl tourmaline, or obsidian

Ironstone Concretion (Limonite/Goethite) (Ferruginous concretion (Fe2O3·nH2O)) — sedimentary

Ironstone Concretion (Limonite/Goethite)

Ferruginous concretion (Fe2O3·nH2O)

Sodalite-rich Syenite (Sunset Sodalite) (Sodalite-Syenite (Na8[Al6Si6O24]Cl2 with KAlSi3O8)) — igneous

Sodalite-rich Syenite (Sunset Sodalite)

Sodalite-Syenite (Na8[Al6Si6O24]Cl2 with KAlSi3O8)

Aventurine (Silicon dioxide (Quartz) with inclusions (KAl2(AlSi3O10)(OH)2)) — mineral

Aventurine

Silicon dioxide (Quartz) with inclusions (KAl2(AlSi3O10)(OH)2)

Manganese Oxide Crust on Limestone (Manganese Oxides (e.g., Pyrolusite MnO2 or Romanechite) on CaCO3) — sedimentary

Manganese Oxide Crust on Limestone

Manganese Oxides (e.g., Pyrolusite MnO2 or Romanechite) on CaCO3

Sandstone (with Iron Siderite Concretion) (Arenite with Ironstone Concretion (FeCO3)) — sedimentary

Sandstone (with Iron Siderite Concretion)

Arenite with Ironstone Concretion (FeCO3)

Obsidian (likely) (Volcanic glass, predominantly silica-rich rhyolitic composition (no fixed mineral formula)) — igneous

Obsidian (likely)

Volcanic glass, predominantly silica-rich rhyolitic composition (no fixed mineral formula)

Concrete / Conglomerate (Man-made) (Artificial Conglomerate (Cementitious Composite)) — sedimentary

Concrete / Conglomerate (Man-made)

Artificial Conglomerate (Cementitious Composite)

Raw quartz crystal, likely iron-stained quartz (Quartz (silicon dioxide, SiO₂)) — mineral

Raw quartz crystal, likely iron-stained quartz

Quartz (silicon dioxide, SiO₂)

Chert (with Manganese Dendrites) (Chert (Cryptocrystalline Quartz, SiO2)) — sedimentary

Chert (with Manganese Dendrites)

Chert (Cryptocrystalline Quartz, SiO2)

White Quartzite (Quartzite (primarily SiO2 - Silicon Dioxide)) — metamorphic

White Quartzite

Quartzite (primarily SiO2 - Silicon Dioxide)

Pyrite (on Quartz matrix) (Iron Disulfide (FeS2)) — mineral

Pyrite (on Quartz matrix)

Iron Disulfide (FeS2)

Black Obsidian (Obsidian, volcanic glass (Amorphous SiO₂)) — Igneous Rock

Black Obsidian

Obsidian, volcanic glass (Amorphous SiO₂)

Obsidian (Black Obsidian) (Obsidian (Volcanic Glass)) — igneous

Obsidian (Black Obsidian)

Obsidian (Volcanic Glass)

Tumbled tektite (likely Indonesian or Philippine tektite) (Natural silica-rich impact glass; chiefly SiO₂ with minor Al₂O₃, FeO, MgO, CaO, and Na₂O) — meteorite

Tumbled tektite (likely Indonesian or Philippine tektite)

Natural silica-rich impact glass; chiefly SiO₂ with minor Al₂O₃, FeO, MgO, CaO, and Na₂O

Obsidian (Volcanic Glass (predominantly SiO2)) — igneous

Obsidian

Volcanic Glass (predominantly SiO2)

Obsidian (Obsidian (principally SiO2 with MgO and Fe3O4)) — igneous

Obsidian

Obsidian (principally SiO2 with MgO and Fe3O4)

Quartzite with inclusions (Quartzite (SiO2)) — metamorphic

Quartzite with inclusions

Quartzite (SiO2)

Bismuth (Bismuth (element Bi) with oxidized thin-film interference layer) — mineral

Bismuth

Bismuth (element Bi) with oxidized thin-film interference layer

Jasper (Jasper (Silicon Dioxide, SiO2)) — sedimentary

Jasper

Jasper (Silicon Dioxide, SiO2)

Obsidian (Obsidian (Volcanic Glass)) — igneous

Obsidian

Obsidian (Volcanic Glass)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Quartzite Pebble (Quartzite (SiO2 with minor impurities)) — metamorphic

Quartzite Pebble

Quartzite (SiO2 with minor impurities)

Possible obsidian (black volcanic glass) (Obsidian; natural silica-rich volcanic glass, composition typically rhyolitic) — igneous

Possible obsidian (black volcanic glass)

Obsidian; natural silica-rich volcanic glass, composition typically rhyolitic

Obsidian (Volcanic glass (SiO2 - Silicon Dioxide)) — Igneous

Obsidian

Volcanic glass (SiO2 - Silicon Dioxide)

Obsidian (Volcanic Glass (High silica amorphous rock)) — igneous

Obsidian

Volcanic Glass (High silica amorphous rock)

Obsidian (Obsidian (Amorphous volcanic glass)) — igneous

Obsidian

Obsidian (Amorphous volcanic glass)

Sodalite (Sodalite (Na8(Al6Si6O24)Cl2)) — mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Dendritic Siltstone (Siltstone with Manganese Oxide dendrites (MnO2)) — sedimentary

Dendritic Siltstone

Siltstone with Manganese Oxide dendrites (MnO2)

Quartz (Milky/River Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/River Quartz)

Silicon Dioxide (SiO2)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Silver (Native Element) (Ag (Argentum)) — mineral

Silver (Native Element)

Ag (Argentum)

Green Quartz (Prasiolite or Aventurine) (Silicon Dioxide (SiO2)) — mineral

Green Quartz (Prasiolite or Aventurine)

Silicon Dioxide (SiO2)

Obsidian (likely black obsidian) (Volcanic glass; predominantly rhyolitic silica-rich melt (approximately 70–80% SiO₂)) — igneous

Obsidian (likely black obsidian)

Volcanic glass; predominantly rhyolitic silica-rich melt (approximately 70–80% SiO₂)

Obsidian (Volcanic glass) — igneous

Obsidian

Volcanic glass

Quartzite (Quartzite (composed primarily of SiO2)) — metamorphic

Quartzite

Quartzite (composed primarily of SiO2)

Ironstone Concretion / Hematite Nodules (Ferruginous Sedimentary Rock (primarily Hematite Fe2O3 and Goethite FeO(OH))) — sedimentary

Ironstone Concretion / Hematite Nodules

Ferruginous Sedimentary Rock (primarily Hematite Fe2O3 and Goethite FeO(OH))

Obsidian (Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)) — igneous

Obsidian

Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)

Obsidian (Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)) — igneous

Obsidian

Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)