Synthetic (Glass)

Quartzite River Rock

Quartzite (primarily SiO2)

Obsidian (Apache Tear)

Obsidian / Amorphous Volcanic Glass (main component: SiO2)

Tektite (Indochinite)

Tektite (Amorphous Silica Glass), SiO2(Al2O3)

Quartzite

Quartzite

Quartzite

Quartzite (primarily SiO2)

Chert (Flint)

Silicon Dioxide (SiO2)

Quartzite

Quartzite (primarily SiO2)

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Chert (Iron-stained)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartzite

Quartzite (SiO2)

Chert (often colloquially referred to as Flint)

Chert (Cryptocrystalline Quartz, SiO2)

Mica (Biotite and Muscovite) in Matrix

Potassium aluminum silicate with iron/magnesium (KAl2(AlSi3O10)(F,OH)2 / K(Mg,Fe)3AlSi3O10(F,OH)2)

Quartzite

Quartzite (SiO2)

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Chert (Chert Pebble)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (with Quartz Veining)

Microcrystalline Quartz (SiO2)

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Scoria

Extrusive Basaltic Scoria

Quartzite

Meta-quartzite (SiO2)

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (primarily SiO2)

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

Quartzite

Quartzite (primarily SiO2)

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2AlSi3O10(OH,F)2)

Chert / Flint

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartzite Pebble

Quartzite (primarily SiO2)

Jasper (Iron-stained Chert)

Silicon Dioxide (SiO2) with iron oxide inclusions

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (primarily SiO2)

Blue Quartzite (River Pebble)

Quartzite (primarily SiO2 with Dumortierite or Crocidolite inclusions)

White Quartzite

Quartzite (primarily SiO2)

Quartzite Pebble

Quartzite (primarily SiO2)

Chert (Jasper/Flint Pebble)

Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)

Rose Quartz

Quartz (Silicon Dioxide, SiO2) with trace amounts of titanium, iron, or manganese

Quartz Druze on Matrix

Silicon Dioxide (SiO2)

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Jasper with Quartz inclusion

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz Cluster

Quartz (Silicon Dioxide - SiO2)