Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
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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Obsidian
Volcanic Glass (Amorphous SiO2-rich glass)
Igneous
Taaffeite
BeMgAl4O8 (Beryllium Magnesium Aluminum Oxide)
mineral
Snowflake Obsidian
Spherulitic Volcanic Glass (primarily SiO2 with Cristobalite inclusions)
igneous
Yellow Aventurine
Quartz containing Muscovite or Mica inclusions (SiO2)
mineral
Fuchsite
Chromian Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Snowflake Obsidian
Spherulitic Obsidian (Volcanic Glass with Cristobalite inclusions)
igneous
Bituminous Coal
Coal (Organically derived sedimentary rock)
sedimentary
Aura Quartz (Titanium Quartz)
Titanium-coated Silicon Dioxide (SiO2 + Ti)
mineral
Obsidian
Obsidian
igneous
Asphalt fragment
Bituminous concrete
anthropogenic material
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Sandstone Concretion
Septarian or Carbonate-cemented Sandstone Concretion
sedimentary
Claystone Concretion
Septarian Concretion (Ironstone-rich)
sedimentary
Green Aventurine
Silicon dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
mineral
Concretion
Sedimentary Concretion (e.g., Siderite or Ironstone)
sedimentary
Likely tektite (impact glass), possibly Muong Nong-type indochinite
Natural impact glass; silica-rich glass, typically ~70–80% SiO₂
mineral
Obsidian
Obsidian (Volcanic Glass)
igneous
Obsidian
Volcanic glass; chiefly rhyolitic silica glass (SiO₂-rich, commonly ~70–80% SiO₂)
igneous
Obsidian
Volcanic glass, primarily SiO₂ (noncrystalline)
igneous
Sandstone (with Concretion)
Arenite / Quartzose Sandstone
sedimentary
Unidentified Dark Mineral or Rock
Indeterminate (Likely Silicon Dioxide or Carbon-based)
mineral
Tumbled smoky quartz
Quartz, silicon dioxide (SiO₂), smoky variety
mineral
Sandstone Concretion
Clastic sedimentary rock (primarily Quartz SiO2 with mineral cement)
sedimentary
Mahogany Obsidian
Obsidian (volcanic glass with hematite/magnetite inclusions)
igneous
Ironstone (likely Limonite or Goethite nodule)
Hydrothermally altered Ferric Hydroxide (FeO(OH)·nH2O)
sedimentary
Likely black obsidian
Volcanic glass; composition broadly rhyolitic (silica-rich), with no crystalline mineral structure
igneous
Concretion
Septarian or Siderite Concretion
sedimentary
Limitation Concretion
Ironstone Concretion (Goethite/Limonite)
sedimentary
Dumortierite Quartz
Dumortierite-bearing Quartz (SiO2 with Al7BO3(SiO4)3O3)
mineral
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Pyrite Sun
Iron Sulfide (FeS2)
mineral
Likely industrial slag or weathered basalt
Basaltic rock; possibly iron-rich furnace slag (diagnosis uncertain from image)
igneous
Snowflake Obsidian
Volcanic glass with Cristobalite inclusions (70–75% SiO2)
igneous
Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous
Red Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Red Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Iron Concretion
Iron oxide concretion (Hematite or Goethite)
sedimentary
Obsidian
Volcanic Glass (mostly SiO2)
igneous
Obsidian
Volcanic Glass (SiO2)
igneous
Pyrite in Quartzite/Graphite Matrix
Iron Sulfide (FeS2)
Mineral