Blue Apatite
Fluorapatite (Ca5(PO4)3F)
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
Obsidian (Volcanic Glass, SiO2 > 70%)
igneous
Polished Black Obsidian
Volcanic Glass (70-75% SiO2)
igneous
Green glass sphere/marble
Soda-lime glass (primarily SiO2, Na2O, CaO)
Man-made object (Simulant)
Pyrite
Iron Disulfide (FeS2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Lepidodendron Fossil (Scale Tree)
Lepidodendron sp.
fossil
Mahogany Obsidian
Volcanic Glass with Hematite/Magnetite (SiO2 + Fe2O3)
igneous
Concretion
Septarian Concretion (Clay-Ironstone Nodules)
sedimentary
Concretion with Quartz Veining
Septarian Concretion (CaCO3 / SiO2)
sedimentary
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Dendritic Opal (Merlinite)
Hydrated Silica with Manganese/Iron oxide inclusions (SiO2·nH2O)
mineral
Chrysoprase
Silicon dioxide (SiO2) with nickel impurities
mineral
Ferruginous Sandstone (Ironstone Conglomerate fragments)
Ferruginous clastic sedimentary rock (SiO2 cemented by Fe2O3)
sedimentary
Ironstone Concretion
Siderite or Goethite Concretion
sedimentary
Concretion with Geode Cavity
Ferruginous Sandstone Concretion with Quartz Center
sedimentary
Obsidian
Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)
Igneous
Dumortierite Quartz
Al7BO3(SiO4)3O3 (Borosilicate mineral/Quartz inclusion)
mineral
Sandstone Concretion
Clastic Sedimentary Concretion (typically Quartz/Silica with Iron Oxide)
sedimentary
Satin Spar Selenite
Satin Spar (Calcium Sulfate Dihydrate, CaSO4·2H2O)
mineral
Dendritic Rhodonite
Rhodonite (Manganese Silicate), (Mn,Fe,Mg,Ca)SiO3
mineral
Sodalite
Sodalite, Na8(Al6Si6O24)Cl2
mineral
Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Auriferous Quartz or Pyritic Ore
Iron Pyrite (FeS2) or Native Gold (Au) in Matrix
mineral
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Obsidian
Volcanic Glass (70% or more SiO2)
igneous
Obsidian
Volcanic glass (mainly SiO2 with inclusions)
igneous
Iron Nodule
Iron-manganese concretion (Fe-Mn hydroxide)
sedimentary
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Obsidian
Obsidian (Volcanic Glass), primarily SiO2
igneous
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (mica)
Mineral (variety of Quartz)
Ferruginous Quartz (Iron-stained Quartz)
Quartz with Iron Oxide inclusions (SiO2 with Fe2O3)
mineral
Orange Calcite (Banded Calcite)
Calcite (Calcium Carbonate, CaCO3)
mineral
Obsidian
Obsidian (principally SiO2/Silicon dioxide)
igneous
Citrine (Yellow Quartz)
Silicon Dioxide (SiO2)
Mineral
Obsidian
Obsidian (volcanic glass)
Igneous
Aventurine
Aventurine Quartz (SiO2 with inclusions)
metamorphic
Obsidian
Volcanic glass (high silica content based on SiO2)
igneous