Sandstone (specifically an Iron-Concretion)
Arenite with Iron Oxide (Limonite/Goethite) cementation
sedimentary
Category
Mineral, Specifically A Rock Fragment
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Red Sandstone (Hematitic)
Clastic sedimentary rock (SiO2 with Fe2O3 inclusions)
sedimentary
Sandstone Pebble
Arenite (specifically Lithic or Quartz Arenite)
sedimentary
Shale with Coprolite influence
Argillaceous sedimentary rock (Shale/Mudstone)
sedimentary
Sandstone (specifically Picture Sandstone or Wonderstone)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Sedimentary Rock (Limestone or Siltstone pebble)
Sedimentary rock fragment
sedimentary
Sandstone (specifically Flagstone)
Arenite (primarily composed of SiO2)
sedimentary
Sandstone (Micaceous/Feldspathic variant)
Arenite (specifically subarkose or lithic arenite)
sedimentary
Pebble (river rock/beach pebble)
Pebble (clast size class)
Sedimentary Rock
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Possible fossilized shell or coral fragment
Indeterminate biogenic carbonate, likely calcite (CaCO₃)
fossil
Chalcedony Geode Fragment (Botryoidal)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Sedimentary Pebble
Sedimentary Rock Fragment
sedimentary
Sandstone Beach Pebble
Clastic Sedimentary Rock (primarily Quartz with Iron Oxide coating)
sedimentary
Fuchsite
K(Al,Cr)2(AlSi3)O10(OH)2
mineral
Sandstone (specifically Lithic or Quartz Arenite)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (Ferruginous)
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Jasper Conglomerate
Polymictic Conglomerate with Jasper and Quartz
sedimentary
Small pale rock fragment
Indeterminate; possibly quartz, calcite, or a weathered feldspar-rich fragment
mineral
River Pebble
Polished Rock Fragment
sedimentary
Unidentified pale stone or mineral specimen
Indeterminate; possibly massive quartz, calcite, or a light-colored feldspathic rock
mineral
Sandstone (specifically Arkose or Ferruginous Sandstone)
Sandstone (SiO2 predominant)
sedimentary
Quartz (Small Fragment)
Silicon Dioxide (SiO2)
mineral
Coprolite
Coprolite (fossilized feces)
fossil
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Conglomerate (Puddingstone)
Conglomerate (specifically, clastic sedimentary rock)
Sedimentary
Sandstone (specifically Red Sandstone)
Arenite (SiO2 with Iron Oxide)
sedimentary
Quartz (specifically Milky or Clear Quartz fragment)
Silicon Dioxide (SiO2)
mineral
River Pebble
Siliceous rock fragment
sedimentary
Rough Quartz in Pegmatite Matrix
Quartz (Silicon Dioxide - SiO2) in Granitic Pegmatite
igneous
Small brown-gray mineral fragment
Indeterminate; possibly weathered quartz-, feldspar-, or iron-oxide-bearing rock
mineral
Unidentified gray rock fragment
Indeterminate from image; possibly quartz- or feldspar-rich silicate material
mineral
Jasper Breccia
Brecciated Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)
sedimentary
River Pebble
Weathered Rock Fragment
sedimentary
Basalt with Magnetite
Crystalline Basalt (Primarily Plagioclase and Pyroxene) with Magnetite (Fe3O4)
igneous
Sandstone (specifically Red Sandstone)
Arenite (primarily Quartz, SiO2)
sedimentary
Jasper (specifically Brecciated or Agated Jasper)
Silicon Dioxide (SiO2) - Chalcedony with impurities
Mineral / Sedimentary
N/A - Image does not contain a rock or mineral
Anthropogenic textile material
Non-geological
Sandstone (specifically Arkose or Ferruginous Sandstone)
Sandstone (SiO2 with iron oxide inclusions)
sedimentary
Crazy Lace Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Quartz Crystal Fragment
Silicon Dioxide (SiO2)
mineral