Mineral (Specifically A Variety Of Chalcedony, Which Is Microcrystalline Quartz)

Feldspar (specifically Orthoclase)

Potassium Aluminum Silicate (KAlSi3O8)

Pink Granite

Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Plagioclase)

Chert (Beach Pebble)

Microcrystalline Quartz (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Chert (variations include Flint/Chalcedony)

Chert (SiO2 - Silicon Dioxide)

Moss Agate

Chalcedony (SiO2) with inclusions of manganese or iron oxides

Chert / Flint

Cryptocrystalline Quartz (SiO2)

Rutilated Quartz

Quartz with Rutile inclusions (SiO2 with TiO2 inclusions)

Quartzite (specifically a river-worn cobble)

Quartzite (primarily Silicon Dioxide, SiO2)

Chert (River Pebble)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Chert (Green variety)

Microcrystalline Opaline/Quartz (SiO2)

Chert (and Chert Flake)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Nodular)

Chert (Microcrystalline Quartz, SiO2)

Chert (Chert Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Chert Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Orange Calcite (Mexican Onyx)

Calcium Carbonate (CaCO3)

Rock Crystal Quartz

Quartz (SiO₂)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Yellow Quartzite (or Quartz River Pebble)

Silicon Dioxide (SiO2)

Picture Jasper

Silicon Dioxide (SiO2) with iron oxide and mineral impurities

Aventurine (likely Green Aventurine)

Aventurine (a variety of quartz, SiO₂, with common inclusions of fuchsite)

Quartz

Quartz (SiO₂)

Banded Agate (specifically shades of Carnelian Agate)

Silicon Dioxide (SiO2)

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Chert (Green variety)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Riverstone Quartzite / Chalcedony Nugget

Silicon Dioxide (SiO2)

Rough Quartz in Pegmatite Matrix

Quartz (Silicon Dioxide - SiO2) in Granitic Pegmatite

Sodalite

Sodalite (Na4Al3Si3O12Cl)

Yellow Quartzite Pebble

Quartzite (SiO2)

Dendritic Agate

Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions

Chert (Flint variety)

Microcrystalline Silica (SiO2)

Jasper with Quartz Veining

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (Brown variety / Common Jasper)

Microcrystalline Quartz (SiO2)

Amazonite

KAlSi3O8 (Potassium Feldspar, variety of Microcline)

Jasper

Silicon Dioxide (SiO2) with iron oxide impurities

Chert (Common Variety)

Cryptocrystalline Quartz (SiO2)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with Iron inclusions)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Jasper (likely Ocean Jasper or Variegated Jasper)

Silicon Dioxide (SiO2) with impurities