Yellow Jasper with Dendritic Inclusions
Silicon Dioxide (SiO2) with Manganese/Iron Oxide inclusions
sedimentary
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
Ferruginous Sandstone Concretion (SiO2 + FeO(OH))
sedimentary
Chrysocolla in Quartz (Gem Silica)
Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla) / SiO2 (Quartz)
mineral
Obsidian
Obsidian
igneous
Black Spinel
Magnesium Aluminum Oxide (MgAl2O4)
mineral
Ironstone Concretion (Limonite/Goethite)
Iron-rich sedimentary rock (FeOx)
sedimentary
Sandstone Concretion
Clastic sedimentary rock (primarily Silica, SiO2, or Calcium Carbonate, CaCO3)
sedimentary
Obsidian
Obsidian (Volcanic Glass)
igneous
Specular Hematite (Specularite) in Matrix
Specularite (Fe2O3)
mineral
Obsidian
Volcanic Glass (SiO2 + minor impurities)
igneous
Sandstone Concretion
Limonitic Sandstone Concretion
sedimentary
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Blue Dumortierite Quartz
Dumortierite Inclusions in Quartz (SiO2 with Al7(BO3)(SiO4)3O3)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Obsidian
Volcanic Glass (Amorphous SiO2-rich glass)
Igneous
Snowflake Obsidian
Spherulitic Obsidian (Volcanic Glass with Cristobalite inclusions)
igneous
Smoky Quartz
Quartz (SiO₂)
Mineral
Aura Quartz (Titanium Quartz)
Titanium-coated Silicon Dioxide (SiO2 + Ti)
mineral
Fuchsite
Chromian Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous
Blue Obsidian
Volcanic Glass (SiO2 with inclusions)
igneous
Green Rutilated Quartz
Silicon Dioxide with Actinolite inclusions (SiO2 + Ca2(Mg,Fe)5Si8O22(OH)2)
mineral
Asphalt (Aggregate)
Bituminous macadam / Concrete Aggregate
sedimentary
Black Obsidian
Volcanic Glass (SiO2 + MgO / Fe3O4)
igneous
Sandstone (with Concretion)
Arenite / Quartzose Sandstone
sedimentary
Yellow Aventurine
Quartz containing Muscovite or Mica inclusions (SiO2)
mineral
Ironstone (likely Limonite or Goethite nodule)
Hydrothermally altered Ferric Hydroxide (FeO(OH)·nH2O)
sedimentary
Green Aventurine
Silicon dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
mineral
Claystone Concretion
Septarian Concretion (Ironstone-rich)
sedimentary
Concretion
Sedimentary Concretion (e.g., Siderite or Ironstone)
sedimentary
Sandstone Concretion
Clastic sedimentary rock (primarily Quartz SiO2 with mineral cement)
sedimentary
Concretion
Septarian or Siderite Concretion
sedimentary
Limitation Concretion
Ironstone Concretion (Goethite/Limonite)
sedimentary
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Snowflake Obsidian
Volcanic glass with Cristobalite inclusions (70–75% SiO2)
igneous
Obsidian
Volcanic Glass (mostly SiO2)
igneous
Obsidian
Volcanic Glass (SiO2)
igneous
Sandstone Concretion
Septarian or Carbonate-cemented Sandstone Concretion
sedimentary
Black Onyx
Silicon Dioxide (SiO2) with parallel banding
mineral
Obsidian
Volcanic Glass (SiO2 - Silicon Dioxide with impurities)
Igneous
Pyrite Sun
Iron Sulfide (FeS2)
mineral