Sedimentary Rock (Possibly A Conglomerate Or Coarse Grained Sandstone)

River Rocks (Basalt and Sedimentary Stones)

Mafic Igneous Rock (Basalt) and Clastic Sedimentary Rock

Green Aventurine

Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)

Quartzite Pebble (River Rock)

Quartzite (mainly SiO2)

Gneiss (Banded Gneiss)

Gneiss

Granite

Phaneritic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)

Granite

Granite (a felsic intrusive igneous rock)

Granite

Granite (Phaneritic intrusive igneous rock; primarily SiO2 and Al2O3)

Greyling Sandstone / Greywacke

Lithic Wacke (SiO2 + diverse mineral fragments)

Limonite Concretion

Goethite-rich Concretion (FeO(OH))

Ferruginous Sandstone (Ironstone Nodules)

Ferruginous Quartz-Arenite (with Goethite/Hematite cement)

Quartzite Pebble

Metamorphic Quartz (SiO2)

Quartz (Water-worn pebble)

Silicon Dioxide (SiO2)

Granite (Alkali-feldspar Granite)

Felsic Plutonic Rock (Primary minerals: Quartz SiO2, Orthoclase KAlSi3O8, Plagioclase (Na,Ca)AlSi3O8)

Quartzite

Quartzite (primarily SiO2)

Fish Fossil in Limestone

Lycoptera (likely) in Micritic Limestone

Sandstone (Quartz-rich)

Arenite (SiO2 based)

Quartzite (specifically an iron-stained or Carnelian-colored variety)

Silicon Dioxide (SiO2) with iron oxide inclusions

Quartzite

Quartzite (SiO2)

Quartzite Pebble (River Rock)

Quartzite (SiO2)

Quartzite

Quartzite (SiO2)

Ferruginous Sandstone (Grit)

Clastic Sedimentary (Ironstone-rich Sandstone)

Red Quartzite

Quartzite (primarily SiO2)

Quartzite River Rock

Quartzite (primarily SiO2)

Green Quartzite

Metamorphic rock primarily composed of Silicon Dioxide (SiO2) with mineral inclusions like fuchsite or chlorite

Desert Varnish (on Sandstone)

Rock Varnish (composed of Manganese oxides, Iron oxides, and Clay minerals)

Quartzite

Quartzite (SiO2)

Blue Chalcedony

Chalcedony (a cryptocrystalline variety of Quartz - SiO₂)

Quartzite with inclusions

Metamorphosed Quartz-rich Rock (SiO2)

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite

Silicon Dioxide (SiO2)

Granite Cobble

Phaneritic Felsic Igneous Rock

Quartzite Pebble

Quartzite (SiO2)

Quartzite Pebble

Quartzite (SiO2)

Siltstone with iron staining

Siltstone (primarily SiO2 with FeO(OH) coatings)

Granite (Pink Orthoclase variety)

Phaneritic intrusive igneous rock (Quartz, Orthoclase, Plagioclase, and Mica)

Quartzite

Quartzite (primarily SiO2)

Ferruginous Quartz (Iron-stained Quartzite)

Silicon Dioxide (SiO2) with iron oxide inclusions

Shale with Iron Oxide Staining

Fissile Mudstone (primarily clay minerals and quartz)

Red Sandstone

Arenite (Ferruginous Sandstone)

Yellow Quartzite (River Pebble)

Quartzite (mainly SiO2)

Yellow Quartzite (Iron-Stained Quartz)

Quartzite (SiO2 with Fe-oxide impurities)