Sedimentary (Secondary Classification: Cryptocrystalline Quartz)

River Rock (Quartzite/Chert conglomerate)

Quartzite (SiO2)

Chert (Gravel)

Microcrystalline silica (SiO2)

Petrified Wood (Jet or Coalified Wood appearance)

Silicified wood (principally SiO2) or Carbonized Wood

Chert (Flint)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Green Aventurine

Quartz (SiO2) with Fuchsite inclusions

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Puddingstone (Gowganda Tillite/Lorrain Quartzite)

Jasper Conglomerate

Puddingstone (Jasper Conglomerate)

Conglomerate (specific type: Jasper Conglomerate or Hertfordshire Puddingstone)

Blue Lace Agate (often dyed)

Silicon dioxide (SiO2) - variety of chalcedony

Clear Quartz

Silicon Dioxide (SiO2)

Jasper (Green Jasper / Chert)

Silicon Dioxide (SiO2) with iron/clay inclusions

Chert

Microcrystalline silica (SiO2)

Ferruginous Quartz (Iron-stained Quartzite)

Silicon Dioxide (SiO2) with iron oxide inclusions

Banded Chert (Agate)

Silicon Dioxide (SiO2)

Chert / Chalcedony (likely carnelian or flint variety)

Silicon Dioxide (SiO2)

Crazy Lace Agate

Silicon Dioxide (Microcrystalline Quartz) - SiO2

Banded Agate (Tumbled)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Yellow Quartz (Chalcedony)

Quartz / Chalcedony (Silicon Dioxide, SiO2)

Banded Chert

Silicon Dioxide (SiO2)

Chert (Jasper)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Dyed Agate

Silicon Dioxide (SiO2)

Chert (Banded)

Chert (Microcrystalline Silicon Dioxide, SiO2)

Chert (Nodule)

Silicon Dioxide (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with goethite or limonite inclusions

Chert (varietal Flint)

Chert (SiO2)

Chert (Arrowhead)

Chert (primarily Microcrystalline Silica, SiO2)

Fossiliferous Chert (Gryphaea Fossil)

Silicon Dioxide (SiO2) with Calcitic Mollusk Remnants

Quartzite

Quartzite (primarily SiO2)

Clear Quartz Crystal

Quartz (Silicon Dioxide, SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Amygdaloidal Basalt

Amygdaloidal Mafic Volcanic Rock

Native Gold (in earring form)

Gold (Au)

Flint

Chert (Silicon dioxide, SiO2)

Dyed Quartz Geode

Silicon Dioxide (SiO2) with artificial pigment

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartzite

Quartzite (SiO2)

Chert (Flint)

Chert (Silicon Dioxide, SiO2)

Blue Lace Agate (with Amethyst Geode center)

Silicon Dioxide (SiO2) - Cryptocrystalline Chalcedony