Chert with Quartz Vein
Silicon dioxide (SiO2)
sedimentary
Category
Sedimentary Or Igneous (Host Environment)
Browse sedimentary or igneous (host environment) specimens identified by the Rock Identifier community.
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Quartz Vein in Basalt or Slate
Hydrothermal quartz vein traversing mafic host rock
metamorphic
Pyrite (on host rock/ore)
Iron Sulfide (FeS2)
mineral
Turquoise in Matrix
Hydrated phosphate of copper and aluminum (CuAl6(PO4)4(OH)8·4H2O)
mineral
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartz Druze on Matrix (Geode Fragment)
Quartz (Silicon Dioxide, SiO2)
mineral
Jasper and Chalcedony Nodule
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Rounded metamorphic pebble, likely mica schist or gneiss
Mica schist/gneiss; commonly quartz, feldspar, and biotite or muscovite mica
metamorphic
River Pebble (Gneiss / Granitic Schist)
Metamorphic Rock (Quartz-Feldspar-Mica assembly)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Pegmatite
Igneous Pegmatite
igneous
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Milky Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
Mineral
Likely foliated metamorphic rock (quartz-mica schist or gneiss)
Quartz–feldspar–mica metamorphic rock; exact identification requires a fresh surface and tests
metamorphic
Sandstone with Ironstone Concretion
Arenite with Hematite/Goethite nodules (Fe2O3 / FeO(OH))
sedimentary
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Gneiss (foliated metamorphic rock)
Gneiss
metamorphic
Gneiss (with Mica and Quartz)
Gneissic Metamorphic Rock
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz with Chalcopyrite (or Pyrite)
Silicon Dioxide (SiO2) with Copper Iron Sulfide (CuFeS2)
mineral
Brachiopod Fossil in Sedimentary Rock
Phylum Brachiopoda fossil imprint in sedimentary matrix
fossil
Pyrite in Slate or Shale
Iron Sulfide (FeS2) in Argillaceous Matrix
mineral
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Hag Stone
Naturally holed stone (typically sedimentary rock such as flint, limestone, or sandstone)
Sedimentary
Flint / Chert Nodules in Limestone
Cryptocrystalline Quartz (SiO2) within Carbonate Rock
sedimentary
Chert (Varietal Agate/Jasper)
Silicon Dioxide (SiO2)
sedimentary
River Stone (Chalcedony/Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Limestone ( weathered ) / Chert Nodular Rock
Sedimentary rock (primarily Calcium Carbonate, CaCO3, with Microcrystalline Quartz, SiO2)
sedimentary
Pyrite on Limestone
Iron Disulfide (FeS2) in Calcium Carbonate (CaCO3) matrix
sedimentary (matrix) / mineral (inclusion)
Quartz Vein in Sandstone
Quartz (SiO2) in Clastic Sedimentary Rock
sedimentary
Pyrite in Host Rock
Iron Disulfide (FeS2)
mineral
Pyrite in Shale
Iron Disulfide (FeS2) in Argillaceous Shale
sedimentary
Fossil shell fragment
Indeterminate molluscan bioclast, likely aragonite or calcite
fossil
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Gneissic River Cobble
Gneiss
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Limestone (Brecciated/Recrystallized)
Calcium Carbonate (CaCO3)
sedimentary
Gneiss (River Cobble)
Metamorphic Gneiss
metamorphic
Veined Limestone (Micrite) with Quartz/Calcite Veins
Calcium Carbonate (CaCO3) with Silicate or Carbonate inclusions
sedimentary
River Rock (Basalt or Sandstone)
Clastic Sedimentary Rock or Extrusive Mafic Igneous Rock
igneous or sedimentary
Iron-stained Quartz
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral