Sedimentary Rock (Technically A Microcrystalline Quartz Mineral Aggregate)

Quartzite (River Pebble)

Quartzite (composed primarily of Silica, SiO2)

Mookaite Jasper

Silicified Radiolarite (SiO2)

Basalt

Basalt (Mafic volcanic rock)

Chert (Black Chert/Flint)

Chert (Silicon Dioxide, SiO2)

Sandstone (Quartzose Sandstone)

Clastic Sedimentary Rock (primarily SiO2)

Chert (Septarian Concretion/Nodule)

Microcrystalline silica (SiO2) with carbonate mineral veining

Sandstone (likely Siltstone variety)

Arenite / Siltstone (primary mineral SiO2)

River Pebble (Basalt)

Basalt (Aphanitic Mafic Igneous Rock)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Banded Sandstone

Arenite (composed primarily of Quartz: SiO2)

Red Sandstone

Arenite (primarily Quartz SiO₂ with Hematite Fe₂O₃ staining)

Jasper with Chalcedony

Silicon Dioxide (SiO2)

Auriferous Quartz (Gold-bearing Quartz)

Silicon Dioxide (SiO2) with Elemental Gold (Au)

Granite or Pegmatite with Mica

Granitoid

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Sandstone (specifically Arkose or Ferruginous Sandstone)

Sandstone (SiO2 with iron oxide inclusions)

Granite Pebble

Granite (Phaneritic intrusive igneous rock)

Slate

Slate (Foliated Metamorphic Rock)

Rutilated Quartz

SiO2 with TiO2 inclusions

Jasper Breccia

Silicon Dioxide (SiO2) - Brecciated Microcrystalline Quartz

Picture Jasper

Silicon Dioxide (SiO2) with mineral inclusions

Sandstone (with cross-bedding)

Arenite (composed primarily of Quartz: SiO2)

Sandstone (likely Fossilized Wood or Concrete Simulacrum)

Arenite / Silicified Wood / Anthropogenic Concrete

Chert (often called Flint or Jasper based on color)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Picture Jasper (specifically Biggs or Deschutes variety)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Pink Quartzite

Quartzite (primarily SiO2)

Sandstone Concretion

Clastic Sedimentary Concretion (typically Quartz/Silica with Iron Oxide)

Sandstone (Grooved/Weathered)

Arenite (composed primarily of Quartz and Lithic fragments)

Quartzite

Quartzite (primarily SiO2)

Granitic Gravel Piece

Granite (Felsic Plutonic Rock / SiO2 with Al2O3, K2O, Na2O)

Quartzite

Quartzite (primarily SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Petrified Wood

Silicified wood (Quartz/Chalcedony - SiO2)

Geode (Unbroken)

Silicon Dioxide (SiO2) usually as Microcrystalline Quartz or Chalcedony

Basalt with Quartz/Epidote Vein

Mafic volcanic rock (formula primarily (Mg, Fe)2SiO4 and CaAl2Si2O8)

River Cobble (Quartzite and Iron-stained Quartz)

Quartzite (SiO2 with iron oxide impurities)

Ferruginous Quartzite (Iron-stained Quartz)

Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3)

Shale

Clastic sedimentary rock (primarily clay and silt minerals)

Chert (specifically Flint)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Chert (and Jasper/Chalcedony mixture)

Microcrystalline Quartz (SiO2)

Quartzite River Stone

Quartzite (primarily SiO2)