Sedimentary Rock (Specifically A Chemical Sedimentary Rock, Or A Chert If Considered Purely Mineral Aggregate)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Andesite

Andesite (Intermediate Extrusive Volcanic Rock)

Sandstone

Arenite (Siliclastic sedimentary rock)

Chert (Jasper variety)

Microcrystalline Quartz (SiO2)

Chert (Iron-stained)

Chert (SiO2)

Ironstone Pebble

Ferruginous sedimentary rock (Fe2O3 / FeO(OH) mixed with SiO2)

Leopardskin Jasper

Jasper (a variety of microcrystalline Quartz)

Sandstone (likely Quartz Sandstone)

Arenite (composed primarily of SiO2)

Vesicular Basalt with Oxidation

Scoriaceous Olivine Basalt (Mafic volcanic rock)

Sandstone (likely Quartzose Sandstone)

Arenite (primarily SiO2)

Crushed Limestone

Calcite-rich Sedimentary Rock (CaCO3)

Conglomerate

Clastic sedimentary rock (Polymictic Conglomerate)

Ferruginous Conglomerate

Ferruginous Conglomerate (Clastic Sedimentary Rock)

Geode Nodules / Chalcedony Geode

Silicon Dioxide (SiO2) - Amorphous to Cryptocrystalline Quartz

Turquoise (Green variety)

Hydrous phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O

Geode with Quartz Crystal Cavity

Silicon Dioxide (SiO2) in Calcareous/Siliceous Matrix

Pyrite in Matrix (Quartz/Schist)

Iron Sulfide (FeS2)

Sandstone

Arenite (composed primarily of SiO2)

Petrified Wood

Silicified wood (Quartz/Chalcedony - SiO2)

Clear Quartz Crystal

Quartz (Silicon Dioxide, SiO2)

Garnet Schist

Almandine-Muscovite Schist

Ferruginous Sandstone (with ripple marks)

Arenite with Iron-Oxide (Fe2O3) cement

Sandstone

Arenite (SiO2 based)

Sandstone (Ferruginous)

Clastic Sedimentary Rock (SiO2 with Fe2O3/FeOOH cement)

Garnet Gneiss

Gneiss containing almandine-pyrope garnet

Sandstone (with Concretion)

Arenite / Quartzose Sandstone

Blue Kyanite

Kyanite (Al2SiO5)

Basalt with Iron Oxidation

Aphanitic Mafic Igneous Rock (composed primarily of Plagioclase and Pyroxene)

Carnelian

Carnelian (Silicon Dioxide - SiO2)

Sandstone (likely Quartzose Sandstone)

Arenite (primarily SiO2)

Sandstone (Quartzite Pebble)

Arenite (SiO2)

White Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Fossiliferous Limestone with Brachiopods

Calcium Carbonate (CaCO3) with fossilized Brachiopoda sp. (likely Order Spiriferida or Rhynchonellida)

Turquoise in Matrix

Hydrated phosphate of copper and aluminum (CuAl6(PO4)4(OH)8·4H2O)

Fish Fossil in Limestone

Lycoptera (likely) in Micritic Limestone

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Chert (Flint/Chalcedony)

Microcrystalline Quartz (SiO2)

Sandstone with Quartz Veining

Clastic sedimentary rock (SiO2 dominated)

Sandstone

Arenite

Gneiss

Gneiss

Quartz (Fieldstone/Pebble)

Silicon Dioxide (SiO2)

Sand (Construction Grade)

Unconsolidated siliciclastic sediment (primarily SiO2)