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
Elephant Molar Fragment (Fossil)
Proboscidea (Elephantidae) molar fragment
fossil
Unknown Rock Fragment
Unknown
unknown
Chert (Flint) with Limestone Matrix
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Quartz Druzy (on Geode Fragments)
Silicon Dioxide (SiO2)
mineral
Pebble
Lithic fragment (Quartzite or general rock pebble)
sedimentary
Brecciated Jasper
Silicon dioxide (SiO2) microcrystalline quartz breccia
sedimentary
Sandstone (Graywacke)
Clastic Sedimentary Rock (Lithic Sandstone)
sedimentary
Sandstone (likely Greywacke or Siltstone variety)
Arenite / Siltstone (primarily SiO2)
sedimentary
Pebble
Lithic fragment / Water-worn rock
sedimentary
Green Quartz (Aventurine or Prase)
Silicon Dioxide (SiO2) with inclusions
mineral
Chalcedony with Quartz Crystals
Silicon Dioxide (SiO2)
mineral
Red Sandstone
Arenite (SiO2 with Fe2O3)
sedimentary
Chalcedony (Agate/Chert)
Silicon Dioxide (SiO2)
mineral
Unidentified rock fragments
Indeterminate; likely a weathered, iron-stained silicate rock
mineral
Generic Pebble
Lithic Fragment
sedimentary
Sandstone (with ripple marks)
Arenite / Quartz Sandstone
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide staining (Fe2O3)
sedimentary
Ferruginous Sandstone
Sandstone (rich in iron oxides/hydroxides)
sedimentary
Sandstone (likely Graywacke or Siltstone variety)
Clastic Sedimentary Rock (SiO2 with assorted mineral fragments)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Chert (specifically a fragment with Desert Varnish)
Microcrystalline quartz (SiO2)
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 with Iron Staining
Clastic sedimentary rock (primarily SiO2 with Fe2O3)
sedimentary
Sandstone
Arenite (specifically Iron-stained Quartz Sandstone)
sedimentary
Sandstone (with Possible Iron Staining/Crust)
Arenite (SiO2 based)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Chert / Flint Nodular Fragment
Microcrystalline quartz (SiO2)
sedimentary
Sandstone (Ferruginous)
Clastic sedimentary rock (SiO2 with Fe2O3)
sedimentary
Sandstone (specifically Arkose or Siltstone variant)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Conglomerate
Polymictic Conglomerate
sedimentary
Sandstone (specifically Banded Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (Banded)
Arenite (primarily SiO2)
sedimentary
Sandstone (Greywacke)
Arenite / Greywacke Sandstone
sedimentary
Painted Rock / Geode Specimen
Silicon Dioxide with artificial pigment coating
mineral