Sandstone Pebble
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Category
Synthetic Material (Not A Rock Or Mineral)
Browse synthetic material (not a rock or mineral) specimens identified by the Rock Identifier community.
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Granite / Gneiss Complex
Felsic Plutonic Rock (Granite) or High-grade Metamorphic Rock (Gneiss)
igneous/metamorphic
Tumbled jasper (likely brecciated or orbicular jasper)
Microcrystalline quartz (SiO₂), with iron-oxide inclusions
mineral
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (Fe-rich SiO2)
sedimentary
Sandstone (Banded)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Fossil Seashell
Invertebrate fossil (Bivalvia)
fossil
Fossil Shell (Bivalve)
Phylum Mollusca, Class Bivalvia
fossil
Milky Quartz/Clear Quartz Cluster
Silicon Dioxide (SiO2)
mineral
Quartzite and Sandstone Pebbles
Silicon dioxide (SiO2)
metamorphic and sedimentary
Quartz–feldspar–mica metamorphic rock, likely gneiss
Gneiss; composition commonly quartz (SiO₂), feldspars, biotite/hornblende, and minor accessory minerals
metamorphic
Sandstone (Red)
Arenite (Fe2O3 heavy)
sedimentary
Sandstone
Arenite (SiO2 principal component)
sedimentary
Sandstone (Quartz-rich)
Arenite (SiO2)
sedimentary
Brown Agate
Cryptocrystalline Quartz (SiO2)
mineral
Sandstone (likely Graywacke or Arkose variant)
Clastic Sedimentary Rock (Lithic Sandstone)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Fossilized Oyster Shell
Exogyra or Ostrea (Gryphaeidae/Ostreidae family)
fossil
White quartz in dark matrix (likely quartz-bearing breccia or polished composite specimen)
Quartz, SiO₂, in an unidentified dark silicate matrix
mineral
Tumbled honey-colored chalcedony or quartzite
Microcrystalline quartz, SiO₂; exact identification requires testing
mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
sedimentary
Granodiorite
Phaneritic intrusive igneous rock
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
K2 Jasper
Azurite in Granite
igneous
Rhyolitic Tuff
Rhyolitic Tuff / Pyroclastic rock
igneous
Sandstone Cobble
Arenite (Sandstone)
sedimentary
Greenschist
Greenschist (Chlorite-actinolite schist)
metamorphic
Sandstone (Ferruginous)
Arenite (with Iron Oxides)
sedimentary
Red Sandstone
Arenite (SiO2 with Fe2O3)
sedimentary
Sandstone
Arenite (primarily Quartz Sandstone)
sedimentary
Sandstone
Arenite (SiO2-rich)
sedimentary
Sandstone (likely Quartzose Sandstone)
Arenite (SiO2 principal composition)
sedimentary
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Greenstone / Greenschist
Greenschist facies metamorphic rock
metamorphic
Sandstone (Pebble)
Arenite (primarily SiO2)
sedimentary
Sandstone (likely Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 based with quartz, feldspar, or lithic fragments)
sedimentary