Sandstone (Quartzose)
Arenite
Category
Browse anthropogenic (man made material mimicking sedimentary rock) specimens identified by the Rock Identifier community.
Sandstone (Quartzose)
Arenite
Sandstone (with potential trace fossils)
Clastic sedimentary rock (primarily SiO2)
Siltstone (Yellow/Brown Sandstone or Siltstone)
Siltstone / Fine-grained Sandstone (rich in iron oxides like limonite)
Sandstone (Quartzose Sandstone / Feldspathic Sandstone)
SiO2 with minor impurities (Fe2O3, KAlSi3O8)
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 cement)
Sandstone
Clastic sedimentary rock (primarily SiO2)
Sandstone with Iron Staining
Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)
Chert (Jasper)
Silicon Dioxide (SiO2)
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Red Sandstone
Arenite (with Iron Oxide cement)
Sandstone Flagstone
Arenite (SiO2 with various cementing agents)
Grey River Pebble (Likely Quartz-rich or Limestone)
Clastic Sedimentary Rock (typically SiO2 or CaCO3 based)
Chert (or potentially Jasper/Chalcedony)
SiO2 (Silicon Dioxide)
Chert (Jasper/Flint variation)
Chert (SiO2)
Rounded gray pebble
Indeterminate; likely a water-worn silicate or carbonate pebble
Red Sandstone
Arenite
Quartz-bearing granite or granitic pegmatite
Felsic intrusive rock, chiefly quartz (SiO₂), feldspar, and minor mica
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 cement)
River Siltstone Pebble
Siltstone (primarily composed of silica and clay minerals)
Conglomerate with Native Copper
Clastic Sedimentary Rock with Native Copper (Cu)
Agate
Silicon Dioxide (Chalcedony), SiO2
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
Quartz Sand/Gravel
Silicon Dioxide (SiO2)
Sandstone
Arenite (SiO2 primarily)
Sandstone
Arenite (primarily SiO2)
Chert (River Pebble with Liesegang Rings)
Microcrystalline Silicon Dioxide (SiO2)
Sandstone (Red Sandstone)
Arenite (predominantly SiO2 with Fe2O3 cement)
Chert (Yellow Jasper/Quartzite Pebble)
Microcrystalline Silicon Dioxide (SiO2)
Red Sandstone (Arkose)
Clastic Sedimentary Rock (Lithic Arkose)
Dark basalt or fine-grained mafic rock
Basalt; primarily plagioclase feldspar, pyroxene, and commonly olivine or iron-titanium oxides
Red Sandstone
Arenite (SiO2 based with Fe2O3)
Sedimentary Breccia
Breccia (Clastic Sedimentary Rock)
Quartz Vein in Sandstone
Hydrothermal Quartz (SiO2) in Arenite
Petrified Wood
Silicified Wood (SiO2)
Gneiss
Orthogneiss / Paragneiss
Sandstone (with Lichen)
Arenite (primarily SiO2)
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
Caliche (with Lichen Cover)
Calcium carbonate-cemented soil layer (CaCO3)
Coprolite
Fossilized Feces
Jasper
Jasper (Silicon Dioxide, SiO2)
Rounded sandstone pebble
Quartz-rich sandstone; commonly arkose or lithic sandstone
Likely weathered sandstone or iron-stained quartzite fragment
Quartz-rich sandstone (predominantly SiO₂; exact identification uncertain from image)