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

Snowflake Obsidian (Volcanic Glass with Cristobalite inclusions (SiO2)) — igneous

Snowflake Obsidian

Volcanic Glass with Cristobalite inclusions (SiO2)

Mahogany Obsidian (Volcanic Glass (predominantly SiO2 with inclusions of Hematite or Magnetite)) — igneous

Mahogany Obsidian

Volcanic Glass (predominantly SiO2 with inclusions of Hematite or Magnetite)

Obsidian (Obsidian (Volcanic Glass)) — igneous

Obsidian

Obsidian (Volcanic Glass)

Golden Sheen Obsidian (Obsidian (volcanic glass) with inclusions of gas bubbles and mineral crystals (e.g., hematite, magnetite) causing the sheen) — igneous

Golden Sheen Obsidian

Obsidian (volcanic glass) with inclusions of gas bubbles and mineral crystals (e.g., hematite, magnetite) causing the sheen

Obsidian (Obsidian (volcanic glass)) — Igneous

Obsidian

Obsidian (volcanic glass)

Pumice (Vesicular Rhyolite or Dacite) — igneous

Pumice

Vesicular Rhyolite or Dacite

Dalmatian Jasper (Peralkaline Rhyolite (composed of Quartz, Feldspar, and Arfvedsonite)) — igneous

Dalmatian Jasper

Peralkaline Rhyolite (composed of Quartz, Feldspar, and Arfvedsonite)

Obsidian (Volcanic Glass (SiO2)) — igneous

Obsidian

Volcanic Glass (SiO2)

Ironstone Nodule (Ironstone Concretion) (Siderite-rich Mudstone (FeCO3) or Limonite (FeO(OH)·nH2O)) — sedimentary

Ironstone Nodule (Ironstone Concretion)

Siderite-rich Mudstone (FeCO3) or Limonite (FeO(OH)·nH2O)

Blue Quartz (Dumortierite Quartz) (SiO2 containing inclusions of Dumortierite [Al7(BO3)(SiO4)3O3]) — metamorphic

Blue Quartz (Dumortierite Quartz)

SiO2 containing inclusions of Dumortierite [Al7(BO3)(SiO4)3O3]

Mahogany Obsidian (Volcanic Glass (with inclusions of Magnetite or Hematite)) — igneous

Mahogany Obsidian

Volcanic Glass (with inclusions of Magnetite or Hematite)

Pyrite (Fool's Gold) (Iron Disulfide (FeS2)) — mineral

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Ironstone Concretion (Limonite/Goethite) (Iron oxide concretion (contains FeO(OH)·nH2O)) — sedimentary

Ironstone Concretion (Limonite/Goethite)

Iron oxide concretion (contains FeO(OH)·nH2O)

Obsidian (Obsidian (Volcanic Glass)) — igneous

Obsidian

Obsidian (Volcanic Glass)

Iron-stained Quartz (Silicon Dioxide (SiO2) with Iron Oxide inclusions) — mineral

Iron-stained Quartz

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Scoria (with likely iron oxidation) (Scoria (Basaltic Scoria)) — igneous

Scoria (with likely iron oxidation)

Scoria (Basaltic Scoria)

Ferruginous Sandstone (Gozzan/Ironstone) (Arenite with Limonite/Goethite cement (FeO(OH)·nH2O)) — sedimentary

Ferruginous Sandstone (Gozzan/Ironstone)

Arenite with Limonite/Goethite cement (FeO(OH)·nH2O)

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

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

Polished black stone, likely obsidian or dark basalt (Volcanic glass (obsidian), possibly basalt; exact identification requires testing) — igneous

Polished black stone, likely obsidian or dark basalt

Volcanic glass (obsidian), possibly basalt; exact identification requires testing

Mahogany Obsidian (Volcanic Glass with Hematite/Magnetite inclusions) — igneous

Mahogany Obsidian

Volcanic Glass with Hematite/Magnetite inclusions

Spinel (Magnesium aluminum oxide (MgAl2O4)) — gemstone

Spinel

Magnesium aluminum oxide (MgAl2O4)

Ironstone Concretion (Ferruginous Sandstone / Siderite Concretion) — sedimentary

Ironstone Concretion

Ferruginous Sandstone / Siderite Concretion

Chrysoprase (Silicon Dioxide (Nickel-bearing Chalcedony) - SiO2) — mineral

Chrysoprase

Silicon Dioxide (Nickel-bearing Chalcedony) - SiO2

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Blue Apatite (Apatite, Ca5(PO4)3(F,Cl,OH)) — mineral

Blue Apatite

Apatite, Ca5(PO4)3(F,Cl,OH)

Obsidian (Volcanic glass (silica-rich rhyolitic melt; primarily SiO₂)) — igneous

Obsidian

Volcanic glass (silica-rich rhyolitic melt; primarily SiO₂)

Obsidian (Volcanic Glass (comprised primarily of SiO2)) — Igneous

Obsidian

Volcanic Glass (comprised primarily of SiO2)

Rhodonite (Manganese Silicate (Mn,Fe,Mg,Ca)SiO3) — mineral

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Chrysoprase (Silicon dioxide with nickel impurities (SiO2 + Ni)) — mineral

Chrysoprase

Silicon dioxide with nickel impurities (SiO2 + Ni)

Nephrite Jade (or Serpentine) (Nephrite (a variety of amphibole mineral tremolite-actinolite) or Serpentine Group minerals) — Mineral/Rock

Nephrite Jade (or Serpentine)

Nephrite (a variety of amphibole mineral tremolite-actinolite) or Serpentine Group minerals

Obsidian (Volcanic glass (Amorphous silicon dioxide)) — igneous

Obsidian

Volcanic glass (Amorphous silicon dioxide)

Obsidian (Volcanic glass) — igneous

Obsidian

Volcanic glass

Pyrite in Shale (Iron Sulfide (FeS2)) — mineral

Pyrite in Shale

Iron Sulfide (FeS2)

Ironstone concretion / Limonitic Sandstone (Goethite/Hematite Cemented Sandstone (Hydrated Iron Oxide)) — sedimentary

Ironstone concretion / Limonitic Sandstone

Goethite/Hematite Cemented Sandstone (Hydrated Iron Oxide)

Tumbled black stone, likely black obsidian (Obsidian — natural volcanic glass, primarily SiO₂) — igneous

Tumbled black stone, likely black obsidian

Obsidian — natural volcanic glass, primarily SiO₂

Pyrite (Fool's Gold) (Iron Disulfide (FeS2)) — mineral

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Black Obsidian (Volcanic Glass (SiO2 + impurities)) — igneous

Black Obsidian

Volcanic Glass (SiO2 + impurities)

Black tourmaline (Schorl, NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄) — mineral

Black tourmaline

Schorl, NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

Snowflake Obsidian (Spherulitic Volcanic Glass (SiO2 + impurities)) — igneous

Snowflake Obsidian

Spherulitic Volcanic Glass (SiO2 + impurities)

Dendritic Opal (Opalized Chalcedony with Manganese Inclusions (SiO2 · nH2O)) — mineral

Dendritic Opal

Opalized Chalcedony with Manganese Inclusions (SiO2 · nH2O)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Snowflake Obsidian (Spherulitic Obsidian (contains Cristobalite inclusions)) — igneous

Snowflake Obsidian

Spherulitic Obsidian (contains Cristobalite inclusions)