Fulgurite
Fulgurite (Lechatelierite/Silica glass)
mineral
Category
Man Made Material (Metal)
Browse man made material (metal) specimens identified by the Rock Identifier community.
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Jasper
Silicon dioxide (Quartz variety), SiO2
sedimentary
Fossil Shell
Brachiopod or Mollusk fossil
fossil
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Fossil Shark Tooth
Otodus sp. or Carcharocles sp. (likely fossilized Chondrichthyes)
fossil
Chert (or Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Limonite (Ironstone)
Limonite (mixture of hydrated iron oxides, primarily Goethite α-FeO(OH))
mineral
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Chalcedony/Common Opal)
Microcrystalline Quartz (SiO2)
sedimentary
Limonite (Iron Ore)
Limonite (Hydrous iron(III) oxide-hydroxide mixture, primarily FeO(OH)·nH2O)
mineral
Jasper Agate
Silicon dioxide (SiO2)
mineral
Jasper (Nephrite-like appearance)
Silicon Dioxide (SiO2) with impurities
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
Mineral
Pyrite (Fool's Gold) Cube
Iron Sulfide (FeS2)
mineral
Chert Nodule in Limestone
Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
River Stone (Greywacke)
Greywacke (immature sandstone)
sedimentary
Milky quartz
Quartz, silicon dioxide (SiO₂)
mineral
Wood Paneling
Engineered Wood / Plywood Paneling
not a rock
Chert (often called Jasper or Flint in this color variety)
Silicon Dioxide (SiO2)
sedimentary
Gravelly, weathered sediment (likely glacial till)
Unconsolidated diamicton; mixed lithologies, commonly including quartz, feldspar, and weathered silicate rock fragments
sedimentary
Weathered quartz-rich stone, possibly fossiliferous limestone
Indeterminate; likely calcite-rich limestone (CaCO₃) or weathered quartz-bearing rock
sedimentary
Tumbled orange chalcedony (likely carnelian)
Microcrystalline quartz, SiO₂; iron-bearing variety commonly termed carnelian
mineral
Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint Nodules)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Chert (SiO2)
sedimentary
Chert
Microcrystalline silica (SiO2)
sedimentary
Weathered gray metamorphic rock, likely phyllite or slate
Micaceous quartz–phyllosilicate rock; commonly quartz + muscovite/illite ± chlorite
metamorphic
Likely weathered quartz-rich rock fragment
Uncertain; possibly granitic pegmatite or quartz-bearing metamorphic rock
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (Jasper Variant likely)
Silicon Dioxide (SiO2)
Sedimentary Rock or Mineral (depending on origin and purity)
Chalcopyrite
Chalcopyrite (CuFeS2)
Mineral
Polished dendritic agate or jasper
Microcrystalline quartz (SiO₂), likely chalcedony with manganese-oxide dendrites
mineral
Polished blue sodalite cabochons
Sodalite, Na₈Al₆Si₆O₂₄Cl₂
mineral
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Tumbled fossil coral or carbonate fossil fragment
Likely fossilized coral, composed mainly of calcite (CaCO₃); exact identification is uncertain from the image
fossil
Sandstone Pebble
Sedimentary Clastic Rock (Quartz Arenite)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite or arkose)
sedimentary
Sandstone
Clastic sedimentary rock (Quartz arenite or Arkose)
sedimentary
Sandstone
Sedimentary Rock (Quartz Arenite)
sedimentary
Sandstone
Sedimentary Rock (Quartz/Feldspar grains cemented together)
sedimentary