Reddish-brown rounded pebble, likely iron-stained sandstone or chert
Probable quartz-rich sandstone (SiO₂), possibly ferruginous chert; exact identification requires testing
sedimentary
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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Sandstone
Arenite (SiO2 primarily)
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
mineral
Sandstone
Sedimentary Rock (Quartz/Feldspar grains cemented together)
sedimentary
Granite (Polished Countertop Surface)
Plutonic Igneous Rock (Felsic)
igneous
Sandstone (Weathered Fragment)
Clastic Sedimentary Rock
sedimentary
Red Jasper (possibly Orbicular Jasper)
Silicon Dioxide with inclusions (SiO2)
sedimentary
Clear Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Ferruginous Sandstone
Arenite with Iron-oxide cement (composed of Quartz and Limonite/Hematite)
sedimentary
Brecciated jasper/chalcedony (iron-stained silica)
Microcrystalline quartz, SiO₂, with iron-oxide inclusions
mineral
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Quartz-rich rock, possibly milky quartz or quartzite
Quartz (silicon dioxide, SiO₂); if granular and foliated, likely quartzite
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Likely dark green-gray metamorphic pebble
Indeterminate; possibly chlorite schist, serpentinite, or amphibolite
metamorphic
Sandstone Pebble
Sandstone (Quartzose/Feldspathic Sandstone)
sedimentary
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Granite
Granite (Plutonic Igneous Rock)
igneous
Sandstone
Arenite
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Clastic sedimentary rock (Quartz arenite)
sedimentary
Sandstone
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Quartz Geode (with Agate banding)
Silicon Dioxide (SiO2)
Sedimentary or Igneous (secondary formation)
Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Turquoise
Turquoise (Hydrated phosphate of copper and aluminium), CuAl6(PO4)4(OH)8·4H2O
mineral
Sandstone (likely Arkosic or Lithic Sandstone)
Sandstone (SiO2 predominant)
sedimentary
Sandstone
Arenite (general term for sandstone)
Sedimentary Rock
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 cement)
sedimentary
Shark Tooth Fossil
Otodus sp. (possibly Cretalamna)
fossil
Limestone or Sandstone Cobble
Sedimentary rock (Calcium carbonate or Quartz based)
sedimentary
Red Sandstone
Arenite (primarily Quartz with Iron Oxide)
sedimentary
Sandstone and Gravel Aggregate
Clastic Sedimentary Rock / Quartzose Sandstone
sedimentary
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Honey calcite (calcite-rich limestone/marble fragment)
Calcite — CaCO₃; likely coarse crystalline calcitic rock
mineral
Sandstone
Arenite
sedimentary
Vesicular volcanic rock, possibly weathered basalt or scoria
Basaltic scoria/vesicular basalt; predominantly plagioclase, pyroxene, and iron-titanium oxides
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Sandstone
Arenite (primarily Quartz-rich)
sedimentary
Sandstone (likely Arkosic or Lithic)
Clastic Sedimentary Rock (composed mostly of SiO2)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary