Not A Rock Or Mineral (Anthropogenic Material)

Milky Quartz

Silicon Dioxide (SiO2)

Red Sandstone (Old Red Sandstone)

Ferruginous Sandstone (SiO2 + Fe2O3)

Sandstone (likely Arkose or Quartz Sandstone)

Arenite (SiO2 principal component)

Slag (Industrial Glass)

Anthropogenic Vitreous Slag (Post-industrial byproduct)

Red Sandstone

Arenite (Ferruginous Sandstone)

Sandstone (likely with Borings or Vesicular Basalt)

Clastic Sedimentary Rock (Sandstone)

Sandstone

Arenite (primarily SiO2)

Sandstone (Red)

Arenite (SiO2 with Fe2O3)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Quartz Pebble (with probable inclusions or staining)

Quartz (Silicon Dioxide - SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone (Quartzite-rich)

Clastic Sedimentary Rock (primarily SiO2)

Rhyolitic Tuff

Rhyolitic Tuff / Pyroclastic rock

Gneiss (Metamorphic Rock)

Gneiss

Sandstone (Ferruginous)

Arenite (primarily SiO2 with iron oxide cement)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone (Water-worn Cobble)

Arenite (variable composition, primarily SiO2)

Sandstone

Arenite

Sandstone (Red/Brown Variety)

Arenite (SiO2 with iron oxide impurities)

Basalt with Quartz/Feldspar Vein

Amygdaloidal Basalt with Plutonic intrusion (SiO2/KAlSi3O8)

Sandstone

Arenite (primarily Quartz, SiO2)

Sandstone (Ferruginous)

Arenite with Iron Oxide cement

Boxwork Quartz / Septarian Jasper

Boxwork (SiO2 with iron oxide inclusions)

Gemstone Sand (Mineral Assortment)

Mixed Mineral Concentrates (Commonly including Quartz SiO2, Garnet X3Y2(SiO4)3, and Tourmaline (Na,Ca)(Li,Mg,Al)3(Al,Fe,Mn)6(BO3)3(Si6O18)(OH,F)4)

River Pebble (Gravel)

Clastic sedimentary rock (likely Siltstone or Mudstone pebble; SiO2 with various impurities)

Sandstone (with Lichen)

Arenite (primarily SiO2)

Sandstone (Quartzose Sandstone)

Clastic sedimentary rock (primarily SiO2)

Sandstone (Ferruginous)

Arenite (Fe-rich)

Sandstone

Sandstone (clastic sedimentary rock, predominantly SiO2)

Asphalt

Asphalt concrete (engineered material, not a naturally occurring rock/mineral in this form)

Sandstone

Arenite (primarily SiO2)

Chrysocolla in Jasper (Chryso-Jasper)

Cu2-xAlx(H2-xSi2O5)(OH)4·n H2O (Chrysocolla) + SiO2 (Jasper)

Sandstone (with biological crust)

Arenite (SiO2 based)

Sandstone (Ferruginous)

Arenite (Fe-rich)

Sandstone (Ferruginous)

Arenite (complex silicate composition with iron oxides)

Caliche (with Lichen Cover)

Calcium carbonate-cemented soil layer (CaCO3)

Sandstone (likely Quartzose Sandstone)

Arenite (primarily SiO2)

Conglomerate

Conglomerate rock

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Limonite (Iron-rich Siltstone / Sandstone base)

Hydrous ferric oxide mixture (FeO(OH)·nH2O)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)