Pyrite
Iron Sulfide (FeS2)
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.
Learn about Industrial Byproduct (Often Mistaken For Obsidian Or Mineral) in the encyclopedia
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Obsidian
Obsidian (Volcanic Glass, SiO2 + impurities)
igneous
Snowflake Obsidian
Obsidian with Cristobalite inclusions
igneous
Iron-stained Quartz
Silicon Dioxide (SiO2) with Limonite/Hematite inclusions
mineral
Obsidian
Volcanic glass
igneous
Obsidian
Obsidian (Volcanic Glass, SiO2)
igneous
Ironstone Concretion (Limonite/Goethite)
Goethite-rich Concretion (FeO(OH))
sedimentary
Rough Sodalite
Sodalite, Na8(Al6Si6O24)Cl2
mineral
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Obsidian
Volcanic glass (SiO2-rich extrusive igneous rock)
igneous
Obsidian
Obsidian (principally SiO2)
igneous
Green Aventurine
Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
mineral
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Obsidian
Obsidian (Volcanic Glass)
igneous
Snowflake Obsidian
Spherulitic Obsidian (contains Cristobalite inclusions)
igneous
Sodalite in Matrix (often called Blue Marble or Sodalite-Syenite)
Sodalite-bearing Syenite / Na8Al6Si6O24Cl2 (Sodalite component)
igneous
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Blue Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Scoria (with likely iron oxidation)
Scoria (Basaltic Scoria)
igneous
Syenite
Syenite (Phaneritic Igneous Rock)
igneous
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Sandstone with Ironstone Concretion
Arenite with Hematite/Goethite nodules (Fe2O3 / FeO(OH))
sedimentary
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Epidote (or Epidote-rich rock)
Epidote. Mineral formula: Ca2(Al,Fe)3(SiO4)3(OH).
Mineral, often found in metamorphic rocks but also in sedimentary and igneous rocks
Nephrite Jade (or Serpentine)
Nephrite (a variety of amphibole mineral tremolite-actinolite) or Serpentine Group minerals
Mineral/Rock
Milky Quartz (Stained with Iron)
Silicon Dioxide (SiO2)
mineral
Snowflake Obsidian
Obsidian with Cristobalite inclusions (SiO2)
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous
Snowflake Obsidian
Spherulitic Obsidian (SiO2 + impurities)
igneous
Bismuth Crystal
Bismuth (Bi)
mineral
Dioptase
Dioptase (CuSiO3 · H2O)
mineral
Goldstone
Aventurine Glass (Man-made)
mineral
Scoria (Lava Rock)
Mafic extrusive volcanic rock (Scientific formula varies based on mineral content: primarily SiO2, MgO, and FeO)
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous
Obsidian
Volcanic glass (primary composition: SiO2)
igneous
Banded Sandstone
Arenite with Liesegang banding
sedimentary
Gold Sheen Obsidian
Volcanic Glass (SiO2 + Fe3O4 / Gas Inclusions)
igneous
Ironstone Concretion (Limonite/Hematite Nodules)
Ironstone (principally Limonite FeO(OH)·nH2O or Hematite Fe2O3 mixed with silica/clay)
sedimentary
Muscovite Schist
Muscovite Mica Schist (KAl2(AlSi3O10)(OH)2)
metamorphic
Blue Apatite
Calcium Phosphate (Ca5(PO4)3(F,Cl,OH))
mineral
Sodalite
Sodalite - Na8(Al6Si6O24)Cl2
mineral