Sodalite
Sodalite - Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2)
mineral
Category
Mixed (Predominantly Sedimentary And Igneous)
Browse mixed (predominantly sedimentary and igneous) specimens identified by the Rock Identifier community.
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Banded Gneiss
Gneiss (Metamorphic high-grade, predominantly SiO2, Al2O3, K2O, Na2O)
metamorphic
Amethyst (Pale/Light Variety)
Quartz (Silicon Dioxide) with Iron impurities - SiO2
mineral
Inukshuk Rock Sculpture (composed of Granite, Slate, and Amethyst)
Silicon Dioxide (Amethyst portion, SiO2) with mixed silicate rock assemblage
mineral
Fossil / Permineralized Bone
Tyrannosaurus rex fossil (Hydroxylapatite replaced by various minerals)
sedimentary
Granite
Intrusive Igneous Rock
igneous
Obsidian Jewelry Piece
Volcanic Glass (SiO2 + impurities)
igneous
Likely pyrite-bearing rock or pyrite fragment
Pyrite (FeS₂), possibly mixed with quartz or carbonate matrix
mineral
Granite
Granite
igneous
K-Feldspar Granite Fragment
Granite (Alkali Feldspar-rich)
igneous
Epidosite (Epidote-rich rock)
Epidosite (consisting primarily of Epidote: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))
metamorphic
Limonite / Goethite (Ironstone Nodule)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
mineral
Unakite (or Epidote-rich Granite)
Unakite (Metamorphosed Granite consisting of Epidote, Orthoclase, and Quartz)
metamorphic
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Tumbled jasper
Microcrystalline quartz (chalcedony), predominantly SiO₂, with iron-oxide inclusions
igneous
Quartz pebble in concrete
Quartz (SiO₂), embedded in Portland-cement concrete
mineral
Cobalt Blue Glass / Cullet Glass
Silicon dioxide (Amorphous man-made glass)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
gemstone
Peach Moonstone (Orange/Peach Feldspar)
Potassium aluminum silicate (KAlSi3O8)
mineral
Tourmaline (Multi-colored)
Complex Borosilicate (Na,Ca)(Li,Mg,Al,Fe)3Al6(BO3)3Si6O18(OH)4
mineral
Weathered polymictic conglomerate or breccia
Polymictic conglomerate/breccia, likely iron-stained and quartz-bearing
sedimentary
Jasper pebble (possibly Red Jasper or Lake Superior Agate/Jasper mix)
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Asphalt Concrete
Bituminous Concrete / Asphaltic Composite
not a natural rock (man-made composite)
Sandstone with Iron Oxide Concretions
Quartzose Sandstone with Limonite/Hematite
sedimentary
Obsidian
Volcanic Glass (predominantly SiO2)
igneous
Obsidian
Volcanic Glass (predominantly SiO2)
igneous
Obsidian
Volcanic Glass (predominantly SiO2)
igneous
Obsidian
Volcanic Glass (predominantly SiO2)
igneous
Obsidian
Volcanic Glass (predominantly SiO2)
igneous
Unidentified Rock Fragment
Unknown
Rock
Sandstone
Clastic sedimentary rock (Quartz arenite)
sedimentary
Mixed metamorphic rock fragments, likely garnet-bearing schist and quartzite
Quartz–feldspar–mica schist/quartzite; red grains may be almandine garnet
metamorphic
Quartzite (Rounded Pebble)
Quartzite (predominantly SiO2)
metamorphic
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Jasper, Agate, Quartz Mix (Polished Beads)
SiO₂ (Silicon Dioxide) for Quartz. Jasper and Agate are cryptocrystalline varieties of Quartz.
Mineral/Semiprecious Gemstone (variety of Quartz)
Smoky Quartz
Silicon Dioxide (SiO₂)
mineral
Amethyst (Faceted)
Quartz (SiO2) with iron impurities
Mineral
Sandstone with Quartz Crystal Infill
Quartz-cemented quartz arenite
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Moss Agate
Chalcedony (SiO2) with inclusions of manganese or iron oxide
mineral
Polished orbicular jasper (likely ocean jasper)
Silicified microcrystalline quartz (SiO₂), commonly called orbicular jasper or ocean jasper
mineral