River/Stream Pebble
Clast / Detrital Grain / Rounded Sedimentary Particle (Compositionally variable, commonly Quartz, Feldspar, Chert, or other resistant rock fragments)
Mineral, specifically a rock fragment
Category
Mineral, Specifically A Rock Fragment
Browse mineral, specifically a rock fragment specimens identified by the Rock Identifier community.
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Generic Rock Fragment
Rock Fragment
sedimentary
Pebble
Lithic fragment / Weathered rock fragment
sedimentary
Pebble
Lithified rock fragment / Sedimentary clast
sedimentary
Pebble
Clast (specifically a granule or small pebble)
Sedimentary
Quartz Geode Fragment
Crystalline Silicon Dioxide (SiO2)
mineral
Quartz Druzy (on Geode Fragments)
Silicon Dioxide (SiO2)
mineral
Brecciated Jasper
Silicon dioxide (SiO2) microcrystalline quartz breccia
sedimentary
Sandstone (Graywacke)
Clastic Sedimentary Rock (Lithic Sandstone)
sedimentary
Elephant Molar Fragment (Fossil)
Proboscidea (Elephantidae) molar fragment
fossil
Sandstone (likely Greywacke or Siltstone variety)
Arenite / Siltstone (primarily SiO2)
sedimentary
Pebble
Lithic fragment (Quartzite or general rock pebble)
sedimentary
Green Quartz (Aventurine or Prase)
Silicon Dioxide (SiO2) with inclusions
mineral
Red Sandstone
Arenite (SiO2 with Fe2O3)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Sandstone (with ripple marks)
Arenite / Quartz Sandstone
sedimentary
Sandstone
Arenite (specifically Iron-stained Quartz Sandstone)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide staining (Fe2O3)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone (likely Graywacke or Siltstone variety)
Clastic Sedimentary Rock (SiO2 with assorted mineral fragments)
sedimentary
Ferruginous Sandstone
Sandstone (rich in iron oxides/hydroxides)
sedimentary
Chert (Flint) with Limestone Matrix
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Sandstone (specifically Arkose or Siltstone variant)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Sandstone with Iron Staining
Clastic sedimentary rock (primarily SiO2 with Fe2O3)
sedimentary
Sandstone (Ferruginous)
Arenite (with iron oxide cement, Fe2O3)
sedimentary
Sandstone (lithic/greywacke variety)
Arenite (composed primarily of SiO2 with various lithic fragments)
sedimentary
Sandstone (specifically Banded Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (Ferruginous)
Clastic sedimentary rock (SiO2 with Fe2O3)
sedimentary
Sandstone Pebble
Arenite (specifically Lithic or Quartz Arenite)
sedimentary
Sandstone (specifically an Iron-Concretion)
Arenite with Iron Oxide (Limonite/Goethite) cementation
sedimentary
Pebble
Lithic fragment / Water-worn rock
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Greenish quartz (likely prase/chalcedony)
Quartz, SiO₂; possibly green chalcedony or chlorite-included quartz
mineral
Sandstone (with Possible Iron Staining/Crust)
Arenite (SiO2 based)
sedimentary
Chert (specifically a fragment with Desert Varnish)
Microcrystalline quartz (SiO2)
sedimentary
Sandstone (Banded)
Arenite (primarily SiO2)
sedimentary
Sandstone (Greywacke)
Arenite / Greywacke Sandstone
sedimentary
Sandstone (specifically Picture Sandstone or Wonderstone)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (specifically Flagstone)
Arenite (primarily composed of SiO2)
sedimentary
Conglomerate
Polymictic Conglomerate
sedimentary
Unknown Rock Fragment
Unknown
unknown
Sandstone (Micaceous/Feldspathic variant)
Arenite (specifically subarkose or lithic arenite)
sedimentary