Sedimentary (Secondary Classification: Cryptocrystalline Quartz)

Carnelian

Carnelian (a variety of Chalcedony, SiO2)

Jasper

Silicon Dioxide (SiO2)

Flint (variety of Chert)

Silicon Dioxide (SiO2)

Chert (specifically Chert Nodule/Flint)

Chert (Silicon Dioxide, SiO2)

Lepidolite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

Gold Nugget

Native Gold (Au)

Petrified Wood

Silicified Wood (primarily SiO₂ - Silicon Dioxide)

Jasper (Iron-rich Chert)

Silicon Dioxide (SiO2) with impurities of Hematite or Goethite

Chert (Nodule)

Chert (mainly Microcrystalline or Cryptocrystalline Quartz, SiO2)

Jasper (with Manganese or Iron inclusions)

Silicon Dioxide (SiO2)

Chert (Flint)

Chert (Silicon Dioxide, SiO2)

Chert (Jasper/Flint variety)

Microcrystalline quartz (SiO2)

Chert (specifically Flint)

Microcrystalline quartz (SiO2)

Chert with Iron Staining

Microcrystalline Quartz (SiO2)

Chert (Flint Nodules)

Chert (Microcrystalline Quartz, SiO2)

Chert (specifically Flint or Novaculite variant)

Chert (Microcrystalline Quartz, SiO2)

Chert (often called Flint)

Chert (Microcrystalline Quartz, SiO2)

Agate

Silicon Dioxide (SiO2) - Cryptocrystalline Chalcedony

Chert (specifically Flint Arrowhead)

Silicon dioxide (SiO2) - Microcrystalline Quartz

Heliotrope (Bloodstone)

Cryptocrystalline Quartz (SiO2) with inclusions of Hematite (Fe2O3)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Vesicular Basalt

Vesicular Basalt (rich in silicate minerals mostly Plagioclase and Pyroxene)

Carnelian

Carnelian (SiO2 - Silicon Dioxide)

Petrified Wood

Silicified Wood (SiO2)

Sandstone (Tumbled/River Pebble)

Arenite (composed primarily of SiO2)

Agate (specifically Botswana or Lake Superior style chalcedony)

Silicon Dioxide (SiO2)

Chert / Flint

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert Pebble/Nodule

Chert (a microcrystalline or cryptocrystalline sedimentary form of quartz, SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Limonite

Limonite (Hydrous iron oxides, predominantly Goethite FeO(OH)·nH2O)

Jasper (Iron-rich)

Silicon Dioxide (SiO2) with Fe2O3 (Hematite) inclusions

Agate (Fortification Agate)

Banded Chalcedony (SiO2)

Jasper Conglomerate (Puddingstone)

Siliceous Conglomerate (Quartz and Jasper clasts in a fine-grained matrix)

Zebra Jasper

Silicon dioxide (SiO2) with various impurities

Chert (White Variety)

Silicon Dioxide (SiO2)

Chert (often referred to as Flint)

Chert (Microcrystalline Quartz, SiO2)

Chert (Flint variety)

Microcrystalline context of Quartz (SiO2)

Chert

Chert (SiO2)

Sulfur on Quartz

Native Sulfur (S8) with Quartz (SiO2)

Petrified Wood

Silicified Wood (SiO2 permineralization)

Chert (Jasper/River Stone)

Silicon dioxide (SiO2) - Microcrystalline quartz

Turquoise in Matrix

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