Metamorphic

Green Aventurine

Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)

Greenstone (Metabaltic/Greenschist)

Chlorite schist / Meta-basalt

Quartzite

Quartzite (primarily Silicon Dioxide, SiO2)

Quartzite (Beach Pebble)

Quartzite (SiO2)

Charoite

Charoite (K(Ca,Na)2Si4O10(OH,F)·nH2O)

Red Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Petrified Wood

Silicified wood (primarily Silicon Dioxide, SiO2)

Blue Tiger's Eye (Hawk's Eye)

Silicified Crocidolite (Pseudomorph of Quartz after Crocidolite), SiO2

Petrified Wood

Silicified Wood (SiO2)

Quartzite

Quartzite (SiO2)

Lavender Jade (Jadeite)

Jadeite - Sodium Aluminum Silicate (NaAlSi2O6)

Quartzite

Quartzite (SiO2)

Quartzite Pebble

Quartzite (SiO2)

Serpentine

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4

Unakite

Epidotized Granite (SiO2, KAlSi3O8, Ca2(Al, Fe)3(SiO4)3(OH))

Quartzite Pebbler

Quartzite (SiO2)

Quartzite

Quartzite (primarily SiO2)

Serpentine (Nephrite-like River Cobble)

Serpentinite (Hydrous Magnesium Iron Silicate)

Serpentine

Antigorite / Lizardite / Chrysotile (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Nephrite Jade

Ca2(Mg, Fe)5Si8O22(OH)2 (Magnesium-rich Tremolite-Actinolite)

Quartzite Pebble (River Rock)

Quartzite (SiO2)

Quartzite Cobble

Quartzite (SiO2)

Green Aventurine

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

Blue Quartzite (Aventurine variety)

Silicon Dioxide (SiO2) with inclusions of Dumortierite or Magnesio-riebeckite

Quartzite

Quartzite (SiO2)

Quartzite River Rock

Quartzite (SiO2)

Quartzite

Quartzite (SiO2)

Unakite

Unakite (Epidotized Granite)

Anthracite Coal

Anthracite

Quartzite

Quartzite (primarily SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (primarily SiO2)

Unakite

Epidotized Granite

Greenstone

Greenschist (metamorphosed mafic igneous rock)

Quartzite Pebble

Quartzite (SiO2)

Quartz (River Siltstone Quartzite Pebble)

Silicon Dioxide (SiO2)

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Tiger's Eye (specifically Blue Tiger's Eye / Falcon's Eye)

Pseudomorph of Quartz after Crocidolite (SiO2)

Gneiss

Gneiss

Quartzite (River Pebble)

Quartzite (SiO2)