Metamorphic

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)

Quartzite

Quartzite (SiO2)

Epidosite (Unakite-related)

Epidosite (predominantly Epidote, Ca2(Al2,Fe3+)(SiO4)3(OH))

Aventurine (Green)

Silicon Dioxide (Quartz with inclusions of Fuchsite)

Quartzite Pebble (with Iron Inclusions)

Quartzite (primarily SiO2 with Fe2O3/FeOOH impurities)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals, (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)

Burmese Jadeite (Water Jade)

Jadeite (NaAlSi2O6)

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (SiO2)

Quartzite Cobble

Quartzite (primarily SiO2)

Quartzite

Quartzite (SiO2)

Garnet-Bearing Gneiss

Almandine-Garnet Gneiss

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Quartzite with Quartz Vein

Quartzite (SiO2)

Soapstone (Steatite)

Steatite (primarily Talc: Mg3Si4O10(OH)2)

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite mica

Marble

Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)

River Cobble (Quartzite and Iron-stained Quartz)

Quartzite (SiO2 with iron oxide impurities)