Sedimentary Rock (Technically A Microcrystalline Quartz Mineral Aggregate)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Banded Agate (with possible Chalcedony layers)

Silicon dioxide (SiO2)

Sandstone (Quartz Sandstone)

Arenite (primarily SiO2)

Granite

Granite (felsic intrusive igneous rock)

Yellow Jasper

Jasper (Silicon Dioxide, SiO2 plus various mineral impurities)

River Stone (River Pebbles)

Alluvial Deposit (typically Quartzite, Sandstone, or Granite clasts)

Yellow Jasper

Silicon Dioxide (SiO2) - variety Jasper

Red Jasper

Jasper (Silica with Hematite impurities), SiO2

Granite Cobble

Felsic Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)

Conglomerate

Conglomeratic Sandstone / Sedimentary Breccia

Sandstone with Quarzite clasts

Arenite (SiO2 based)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with iron oxide staining/cementing)

Chert (often called Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (variations include Chalcedony and Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Yellow Jasper/River Pebble)

Microcrystalline Quartz (SiO2)

Chert (Jasper variety)

Microcrystalline Quartz (SiO2)

Chert / Flint

Microcrystalline Quartz (SiO2)

Quartzite (Iron-stained)

Quartzite (primarily SiO2)

Granite

Phaneritic Intrusive Igneous Rock (composed primarily of Quartz, Feldspar, and Mica)

Red Sandstone

Arenite (primarily Quartz, SiO2, with Iron Oxide cementing agent)

Aquamarine and clear quartz

Aquamarine (Be3Al2Si6O18), Quartz (SiO2)

Pink Quartzite

Quartzite (mainly SiO2 with iron oxide impurities)

Granite Glacial Erratic

Granite (Phaneritic Quartz-Feldspar Plutonic Rock)

Chert (specifically Flint or Jasper variant)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Asphalt Concrete (Bituminous Concrete)

Bituminous aggregate

Yellow Jasper

Silicon Dioxide (SiO2) with high iron inclusion

Conglomerate

Conglomerate (SiO2 primary clasts with lithic matrix)

Quartzite

Quartzite (primarily SiO2)

Crushed Limestone and Calcite

Calcium Carbonate (CaCO3)

Mica Schist

Crystalline Schist (often containing Muscovite, Biotite, and Quartz)

Quartzite pebble

Quartzite (primarily SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Sandstone (Ferruginous)

Arenite (with Iron Oxide cement)

Quartz with Iron Staining

Silicon Dioxide (SiO2) with iron oxide impurities

Jasper in Quartzite (likely Cinnabar or Iron inclusions)

Silicon dioxide (SiO2) with impurities

Red Sandstone

Arenite (with Iron Oxide / Hematite cementation)

Calcite (Yellow/Orange variety - sometimes called Honey Calcite)

Calcite

Granitic Pegmatite (River Rock specimen)

Granite / Pegmatite (composed of SiO2, KAlSi3O8, and NaAlSi3O8)

Milky Quartz

Silicon Dioxide (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Agate (specifically, a slice of a Blue Lace or Chalcedony Agate nodule)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Quartzite pebble

Quartzite (primarily SiO2)