Gneiss (Cobble)
Gneiss
metamorphic
Category
Sedimentary Like (Industrial Composite)
Browse sedimentary like (industrial composite) specimens identified by the Rock Identifier community.
Learn about Sedimentary Like (Industrial Composite) in the encyclopedia
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Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Ironstone (Limonitic/Hematitic Sandstone)
Ferruginous sandstone (predominantly Fe2O3 and FeO(OH))
sedimentary
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz Geode
Silicon Dioxide (SiO2) within a geode
mineral
Quartz Crystal with Inclusions
Silicon Dioxide (SiO2)
mineral
Turquoise and Hematite
CuAl6(PO4)4(OH)8·4H2O (Turquoise) and Fe2O3 (Hematite)
mineral
Sandstone (lithic wacke)
Arenite / Lithic Wacke (mostly SiO2 with rock fragments)
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
Mineral
Quartz Druzy (Geode Fragment)
Silicon Dioxide (SiO2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Polished basalt or basaltic river pebble
Basalt; fine-grained plagioclase–pyroxene rock, possibly containing olivine
igneous
Asphalt (Bituminous Slate/Sandstone)
Asphaltum / Bituminous Rock
sedimentary
Fossil brachiopod
Brachiopoda; likely a spiriferid or strophomenid brachiopod
fossil
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Chert (Iron-stained)
Chert (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert / Jasper
Silicon Dioxide (SiO2)
sedimentary
Polymictic breccia, possibly volcanic breccia
Polymictic clastic breccia; likely a matrix-supported breccia containing lithic fragments, quartz, feldspar, and dark mafic minerals
sedimentary
Ironstone (likely Limonite or Goethite)
Ferruginous sedimentary rock (FeO(OH)·nH2O)
sedimentary
Chalk
Calcium Carbonate (CaCO3)
sedimentary
Magnetite
Magnetite (Fe3O4)
mineral
Agate
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (Red Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Red Jasper variant)
Silicon dioxide (SiO2)
sedimentary
Chert (often called Flint or Jasper)
Silicon Dioxide (SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Likely polished leopard-skin jasper or brecciated jasper
Jasper, an opaque microcrystalline variety of quartz (SiO₂), with iron-oxide and other mineral inclusions; exact variety cannot be confirmed from the image alone
sedimentary
Chert (Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Dyed Agate Slice
Silicon Dioxide (SiO2) with artificial colorants
Mineral (variety of Chalcedony)
Polished banded stone, likely zebra jasper
Zebra jasper (banded microcrystalline quartz, chiefly SiO₂, with iron-oxide and carbonate impurities)
metamorphic
Garnet in Schist (Polished Tower)
Almandine Garnet (Fe3Al2(SiO4)3) in Mica Schist
metamorphic
Clear Quartz Crystal
Quartz (Silicon Dioxide, SiO2)
mineral
Limestone River Pebble
Calcium carbonate (CaCO3) - micritic limestone
sedimentary
Chalcedony Geode Part (Agate/Quartz)
Silicon Dioxide (SiO2)
mineral
Sandstone (Quartz-rich)
Clastic sedimentary rock (SiO2 primary)
sedimentary
Fossilized Oyster Shell
Gryphaea or Crassostrea fossil (Calcium Carbonate, CaCO3)
sedimentary
Chert (Common Opal/Quartz mix)
Microcrystalline Silicon Dioxide (SiO2)
sedimentary
Ferruginous Sandstone
Arenite with Iron-Oxide Cement (SiO2 with Fe2O3/FeO(OH))
sedimentary
Bauxite
AlOx(OH)3-2x (mixture of Gibbsite, Boehmite, and Diaspore)
sedimentary
Agate Nodule / Weathered Chert
SiO2 (Silicon Dioxide - Microcrystalline Quartz)
Sedimentary / Mineral