Obsidian Fetish Carving with Turquoise Inlay
Volcanic Glass with Turquoise (CuAl6(PO4)4(OH)8·4H2O)
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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Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
mineral
Obsidian Arrowhead
Volcanic Glass (70% or more SiO2)
Igneous
Aventurine
Aventurine Quartz (SiO2 with inclusions of Fuchsite)
metamorphic
Black Obsidian
Volcanic glass
igneous
Black Obsidian
Volcanic Glass (SiO2 + impurities)
Igneous
Ironstone Concretion
Ferruginous Sandstone / Hematite-rich Concretion
sedimentary
Sandstone (specifically an Iron-Concretion)
Arenite with Iron Oxide (Limonite/Goethite) cementation
sedimentary
Yellow Quartz (Citrine/Yellow Jasper)
Silicon Dioxide (SiO2)
mineral
Snowflake Obsidian (possibly mixed with Jasper or other matrix)
Obsidian with Cristobalite inclusions
igneous
Mahogany Obsidian
Obsidian (Volcanic Glass with Hematite/Magnetite inclusions)
igneous
Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Ironstone (Limonite/Goethite Concretion)
Ferruginous Sedimentary Rock (composed of Goethite FeO(OH) and Limonite)
sedimentary
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
mineral
Lapis Lazuli
Lapis Lazuli (Primary mineral: Lazurite, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Siltstone
Siltstone (composed of clastic quartz and feldspar)
sedimentary
Ironstone Concretion (Limonite/Goethite)
Ferruginous Sandstone / Ironstone (FeO(OH)·nH2O)
sedimentary
Raw Corundum (Sapphire/Ruby variant)
Aluminum oxide (Al2O3)
mineral
Dumortierite Quartz
Dumortierite (Al7BO3(SiO4)3O3) in Quartz (SiO2)
metamorphic
Mica Schist with Pyrite
Mica Schist (FeS2 containing)
metamorphic
Black Obsidian
Obsidian (Volcanic Glass)
igneous
Siltstone or Mudstone
Siltstone (composed primarily of silt-sized particles)
sedimentary
Siltstone
Siltstone (primarily SiO2 with various silicates)
sedimentary
Goldstone (Brown/Gold)
Aventurine Glass (Man-made glass with Copper inclusions)
gemstone
Scoria (Lava Rock)
Vesicular Basalt / Scoria
igneous
Siltstone
Siltstone (primarily SiO2 with Al2O3)
sedimentary
Vesicular Basalt (Scoria)
Vesicular Basalt
igneous
Amazonite
Microcline Feldspar (KAlSi3O8)
mineral
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Amazonite
Amazonite (KAlSi3O8); a green variety of Microcline feldspar
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Mahogany Obsidian
Natural Volcanic Glass (SiO2 with iron and magnesium oxides)
igneous
Likely obsidian (possibly tektite or slag glass)
Volcanic glass; primarily SiO₂, noncrystalline
igneous
Chert (Jasper)
Microcrystalline Quartz (SiO2) with Iron Oxide impurities
sedimentary
Ironstone Concretion
Siderite or Hematite Concretion
sedimentary
Banded Siltstone
Siltstone (primarily SiO2 with Al2O3)
sedimentary
Fossilized Brachiopod
Brachiopoda (e.g., Rhynchonellida or Spiriferida)
sedimentary
Siltstone Pebble
Siltstone (fine-grained siliciclastic sedimentary rock)
sedimentary
Black Obsidian
Amorphous volcanic glass (SiO2 + impurities)
igneous
Gold Sheen Obsidian
Volcanic Glass (SiO2 + Fe3O4 / Gas Inclusions)
igneous
Quartzite Pebble
Quartzite (SiO2)
metamorphic