Aventurine
Silicon Dioxide (SiO2) with inclusions
metamorphic
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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Sandstone concretion
Arenite sedimentary rock (concretion/nodule)
sedimentary
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Obsidian
Volcanic glass
igneous
Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Sodalite
Sodalite - Na8(Al6Si6O24)Cl2
mineral
Obsidian
Volcanic Glass
igneous
Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Pink and Green Tourmaline (Tumbled)
Elbaite (Na(Li,Al)3Al6(BO3)3Si6O18(OH)4)
mineral
Ironstone Nodule
Ironstone (Ferruginous Rock)
sedimentary
Milky Quartz with Mica Matrix
SiO2 (Silicon Dioxide) with Muscovite/Biotite mica
mineral
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
Chert (Flint)
Chert (SiO2)
sedimentary
Sandstone Concretion
Arenaceous concretion (primarily SiO2 with Fe2O3 staining)
sedimentary
Ironstone Concretion
Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)
sedimentary
Strawberry Quartz (Aventurine)
Silicon Dioxide with Hematite/Lepidocrocite inclusions (SiO2)
mineral
Dendritic Agate (River Pebble)
Silicon Dioxide (SiO2) with Manganese or Iron oxide inclusions
mineral
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
mineral
Green Chalcedony (likely Chrysoprase or Green Onyx)
Silicon Dioxide (SiO2) with trace nickel or chromium inclusions
mineral
Fuchsite
Chromium-rich Muscovite (KAl2(AlSi3O10)(OH,F)2 with Cr replacements)
mineral
Sandstone Concretion
Sandstone (Sedimentary Rock) with silica or calcite cement
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Concretion
Sedimentary Concretion (Ironstone / Calcite Concretion)
sedimentary
Fossiliferous Concretion
Septarian Concretion containing Brachiopods/Crinoids
fossil
Obsidian
Obsidian (Volcanic Glass, ~70% SiO2)
igneous
Goldstone
Aventurine Glass (SiO2 + Cu small inclusions)
man-made glass mineral simulant
Ironstone Concretion
Goethite-rich Siltstone / Siderite (FeCO3)
sedimentary
Ironstone Concretion
Siderite or Hematite Concretion (FeCO3 or Fe2O3)
sedimentary
Obsidian
Obsidian (Volcanic Glass, complex silicate)
igneous
Obsidian
Volcanic Glass (Amorphous Silica, SiO2)
igneous
Polished mahogany obsidian
Volcanic glass; rhyolitic obsidian, commonly with iron-oxide coloration
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Goldstone (Brown)
Aventurine glass
mineraloid (man-made)
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Obsidian
Obsidian (Volcanic Glass, SiO2 dominated)
igneous
Black drusy mineral coating, possibly hematite or manganese oxide
Undetermined; likely microcrystalline hematite (Fe₂O₃) or manganese oxides such as pyrolusite (MnO₂)
mineral
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Dendritic Siltstone
Siltstone with Manganese Dendrites (MnO2)
sedimentary
Dendritic Jasper (River Stone)
Silicon Dioxide (SiO2) with Manganese/Iron Oxide inclusions
sedimentary