Obsidian
Obsidian (volcanic glass), predominantly Silicon Dioxide (SiO2)
igneous
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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Black Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)
igneous
Green Aventurine
Silicon Dioxide (Quartz with Fuchsite inclusions) - SiO2
metamorphic
Obsidian
Obsidian (Volcanic Glass)
igneous
Ironstone Concretion
Siderite or Hematite Concretion
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Mahogany Obsidian
Volcanic glass (SiO2 with Hematite or Magnetite inclusions)
igneous
Dalmation Stone (Dalmation Jasper)
Peralkaline rock (primarily Feldspar and Quartz with Arfvedsonite spots)
igneous
Black Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide) with impurities
igneous
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Limonite Concretion (Ironstone)
Limonite (FeO(OH)·nH2O) / Goethite
sedimentary
Obsidian
Obsidian (Volcanic Glass, primarily SiO2)
igneous
Ironstone Concretion
Siderite or Ferruginous Concretion (FeCO3 or Iron Oxides)
sedimentary
Obsidian
Obsidian (Volcanic Glass)
igneous
Obsidian
Volcanic Glass (SiO2)
igneous
Obsidian
Volcanic Glass (70-75% SiO2)
igneous
Obsidian
Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)
igneous
Obsidian
Volcanic Glass (SiO2)
igneous
Obsidian
Volcanic Glass (predominantly SiO2)
igneous
Ironstone Concretion (Pot Stone)
Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)
sedimentary
Sandstone (Wonderstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Sodalite and Calcite
Na8(Al6Si6O24)Cl2 (Sodalite) and CaCO3 (Calcite)
mineral
Sandstone Concretion
Ferruginous Sandstone Concretion
sedimentary
Felted Quartz / Chlorite Quartz
Chlorite included Quartz (SiO2 + (Mg,Fe)3(Si,Al)2O5(OH)4)
mineral
Obsidian
Amorphous volcanic glass (SiO2)
igneous
Obsidian
Volcanic Glass (SiO2)
igneous
Snowflake Obsidian
Hydrated Volcanic Glass with Cristobalite inclusions
igneous
Obsidian
Volcanic Glass (Amorphous Silica)
igneous
Obsidian
Volcanic glass (high silica volcanic rock)
igneous
Obsidian
Volcanic Glass (70-75% SiO2 with MgO and Fe3O4)
igneous
Obsidian
Obsidian (principally SiO2 + MgO, Fe3O4)
igneous
Ferruginous Quartz (Iron-Stained Quartz)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Chalcopyrite in Quartz (Gold Ore Matrix)
CuFeS2 (Chalcopyrite) with SiO2 (Quartz)
mineral
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Ironstone Concretion
Ironstone (Siderite/Limonite/Goethite)
sedimentary
Goldstone
Aventurine Glass (SiO2 + Cu small inclusions)
man-made glass mineral simulant
Orange Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Obsidian (Tumbled Apache Tear)
Volcanic Glass (SiO2)
igneous
Obsidian
Obsidian (Volcanic Glass; SiO2 content > 70%)
igneous
Obsidian
Obsidian (Volcanic Glass, SiO2 + impurities)
igneous
Obsidian
Volcanic Glass (70-75% SiO2)
igneous
Diorite (Salt and Pepper Rock)
Diorite
igneous