Sedimentary (Secondary Classification: Cryptocrystalline Quartz)

Vesicular Basalt with Epidote

Vesicular Basalt (Mg, Fe)2SiO4 with Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))

Petrified Wood

Silicified Wood (SiO2)

Chert (Nodule)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (specifically White Chert or Novaculite)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (varieties include Flint and Jasper)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (and/or Siltstone River Pebble)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (Grey Flint)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Agate

Agate (a cryptocrystalline variety of Quartz, SiO₂)

Turquoise (with Hematite)

CuAl6(PO4)4(OH)8·4H2O

Red Jasper

Jasper (a cryptocrystalline variety of Quartz, SiO₂)

Calcite

Calcium Carbonate (CaCO3)

Chert (specifically Jasper/Flint)

Chert (SiO2)

Quartz Pebble (Chalcedony/Agate variety)

Silicon Dioxide (SiO2)

Jasper-Quartz Conglomerate / Chert

Siliceous Sedimentary Rock (SiO2)

Chert (Iron-rich)

Silicon Dioxide (SiO2) with Hematite (Fe2O3)

Quartz Pebble

Silicon Dioxide (SiO2)

Chert (with small quartz inclusion)

Microcrystalline Silica (SiO2)

Limonite/Goethite Nodule

Iron Oxyhydroxide (primarily FeO(OH)·nH2O)

Chert (Flint nodule)

Silicon dioxide (SiO2)

Chert (Nodule/Pebble)

Chert (Silicon Dioxide, SiO2)

Vesicular Basalt (River Pebble)

Vesicular Basalt

Banded Chert (Agate-like Flint)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (specifically Flint or Gray Chert)

Silicon Dioxide (Microcrystalline Quartz), SiO2

Chert (Flint)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (Chert Nodule)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Yellow Chalcedony or River Jasper

Silicon Dioxide (SiO2)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Chert (often called Flint)

Chert (Microcrystalline or cryptocrystalline Silica, SiO2)

Chalcedony Nodule (Commonly known as Agate or Chert)

Microcrystalline Quartz (SiO2)

Limonite (Ironstone)

Limonite (mixture of hydrated iron oxides, primarily Goethite α-FeO(OH))

Yellow Ochre / Limonite

Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)

Chert (Iron-stained)

Chert (primarily Microcrystalline Quartz, SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Chert (Flint)

SiO2 (predominantly microcrystalline or cryptocrystalline quartz)

Jasper Conglomerate (Puddingstone)

Jasper Conglomerate (SiO2 matrix with quartz/jasper clasts)

Quartzite (River Stone)

Quartzite (composed primarily of Silicon Dioxide, SiO2)

Quartzite (Potentially Ferruginous)

Quartzite (SiO2)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Quartz (Milky Quartz)

Quartz (SiO2 - Silicon Dioxide)

Chert / Quartz Pebble

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (often called Flint or Jasper locally)

Chert (Microcrystalline Quartz, Formula: SiO2)

Shiva Lingam

Cryptocrystalline Quartz (Jasperiod Silicate with Iron Oxide inclusions)