Sedimentary Rock (Possibly A Conglomerate Or Coarse Grained Sandstone)

Sandstone (Pebble)

Sandstone (SiO2 with iron oxide impurities)

Rounded sandstone pebble

Quartz-rich sandstone; commonly arkose or lithic sandstone

Weathered quartz-rich metamorphic rock (probable quartzite)

Quartzite, predominantly crystalline SiO₂, possibly derived from sandstone

Sandstone

Arenite (mostly SiO2)

Iron-stained quartz-bearing rock, possibly weathered granite or gneiss

Quartz–feldspar rock with iron-oxide staining; exact identification requires testing

Sandstone (with potential iron-oxide weathering)

Arenite (SiO2 based)

Sandstone (with Iron concretions/staining)

Arenite (composed primarily of Quartz and Feldspar with Iron Oxide cement)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone

Arenite (SiO2 primarily)

Sandstone

Arenite (primarily SiO2 with various cementing agents)

Sandstone

Arenite (primarily SiO2)

Sandstone

Arenite (primarily SiO2)

Sandstone

Arenite (Clastic Sedimentary Rock)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Sandstone

Sedimentary Rock (Quartz Sandstone)

Sandstone

Sedimentary Rock (Quartzose Sandstone)

Weathered granitic rock

Granite or granodiorite; chiefly quartz, feldspar, and biotite/hornblende

Sandstone

Arenite (SiO2 primarily)

Sandstone (River Rock)

Arenite (SiO2 principal component)

Shale (with Iron Oxide staining)

Fissile Mudstone (primarily Quartz and Clay minerals)

Sandstone

Arenite

River Rock (Greywacke/Sandstone)

Arenite / Lithic Sandstone

Sandstone

Arenite (SiO2 based with quartz grains)

Sandstone (likely Graywacke or Arkosic varieties)

Arenite (composed primarily of SiO2)

Sandstone

Arenite (SiO2 based with various mineral cements)

Sandstone

Arenite

Siltstone or Mudstone

Argillaceous sedimentary rock

Weathered quartz-rich rock, possibly iron-stained quartz or quartzite

Quartz (SiO₂), likely in a quartzite or quartz-vein matrix with iron oxides

Greywacke (River Siltstone)

Lithic Sandstone / Greywacke

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Sandstone (likely Quartzose Sandstone)

Arenite (composed primarily of SiO2)

Landscape Boulder / River Rock

Granitic or Quartzite Rock

Sandstone (Micaceous/Feldspathic variant)

Arenite (specifically subarkose or lithic arenite)

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly crystalline SiO₂, possibly with iron-oxide staining and minor feldspar or mica

Limestone with Fossil Imprints

Biogenic Limestone (Calcium Carbonate, CaCO3)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with mica or feldspar

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily Quartz with Limonite/Goethite staining)