River Rock / Stream Pebble
Fluvial Clast / Rounded Sedimentary Particle
Sedimentary Rock (possibly composed of various minerals)
Category
Sedimentary Rock (Possibly Composed Of Various Minerals)
Browse sedimentary rock (possibly composed of various minerals) specimens identified by the Rock Identifier community.
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River Rock
Sedimentary clast
sedimentary
Sandstone
Arenite (Siliclastic sedimentary rock), SiO2 + various minerals
sedimentary
Gravel and Sediment Sample
Mixed clastic sediment
sedimentary
Sidewalk Chalk
Calcium Carbonate (CaCO3) / Gypsum
sedimentary
Gravel and Pebbles
Unconsolidated rock fragments / detrital sediment
sedimentary
Sandstone (likely Graywacke or Lithic Arenite)
Clastic sedimentary rock predominantly composed of silicate grains
sedimentary
Limonite/Goethite on Shale
Hydrous ferric oxides (FeO(OH)·nH2O) often associated with argillaceous rock
sedimentary
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide cement (SiO2 + Fe2O3)
sedimentary
Chakra Crystal Bracelet
Mixed Mineral Assortment
gemstone
Laterite (iron-rich nodule, possibly Bauxite as a subtype)
Laterite (composed of various minerals including goethite, hematite, gibbsite, etc.)
Sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (Quartzose Sandstone)
Sandstone (SiO2 with various trace minerals)
sedimentary
Sandstone
Arenite (Siliclastic sedimentary rock)
sedimentary
Sandstone (likely Graywacke or Lithic Sandstone)
Clastic Sedimentary Rock
sedimentary
Sandstone
Arenite (Sedimentary rock)
sedimentary
Granite
Granite (composed of Quartz, Feldspar, and Mica)
igneous
Sandstone
Clastic Sedimentary Rock (composed primarily of Quartz: SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Arenite (SiO2 + various cementing minerals)
sedimentary
Sandstone
Arenite (SiO2 based with various mineral cements)
sedimentary
Mixed Tumbled Rocks and Minerals Collection
Mixed Minerals and Rocks (Quartz, Feldspar, Jasper, Agate, Lapis Lazuli, Sodalite, Rose Quartz, Fluorite, etc.)
mineral
Siltstone
Siltstone (composed of microscopic quartz and clay minerals)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Bauxite
Bauxite (Mixture of Al(OH)3, AlO(OH), and Fe2O3)
sedimentary
Volcanic Breccia
Pyroclastic breccia
igneous
Sandstone
Arenite (mostly Quartz-based)
sedimentary
Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Likely milky quartz, possibly quartz-rich vein rock
Quartz (SiO₂); identification from the image is uncertain
mineral
River Rock
N/A - General term for water-worn stones
sedimentary
Beaded Gemstone Bracelet
Composite Mineral Assemblage
gemstone
Chalcedony (Agate / Chert)
Silicon Dioxide (SiO2)
mineral
Granite
Granite (Felsic Plutonic Rock)
igneous
Sandstone
Arenite
sedimentary
Shale (possibly Carbonaceous or Oil Shale)
Argillaceous Sedimentary Rock
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Mixed River Stones and Minerals
Mixed Silica-rich Stones (Quartz, Agate, Jasper, Sandstone, Dalmation Stone)
sedimentary
Sandstone
Arenite
sedimentary