Metamorphic

Charoite

K(Ca,Na)2Si4O10(OH,F)·H2O

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (SiO2)

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Quartzite

Quartzite (SiO2)

Yellow Quartzite

Quartzite (primarily SiO2)

Nephrite Jade

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

Quartzite

Quartzite (SiO2)

Pink Quartzite

Quartzite (SiO2 with iron oxide inclusions)

Yellow Quartzite (Beach Pebble)

Quartzite (primarily SiO2)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Quartzite

Quartzite (SiO2)

Lapis Lazuli

Na8(Al6Si6O24)S2 (composed primarily of Lazurite, Calcite, and Pyrite)

Quartzite Pebble

Quartzite (primarily Silicon Dioxide, SiO2)

Schist

Mica Schist

Quartzite

Quartzite (chiefly SiO2)

Quartzite

Quartzite (primarily SiO2)

Nephrite Jade

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

Quartzite Pebble (River Rock)

Quartzite (mainly SiO2)

Red Quartzite (likely Purple/Red variety)

Quartzite (SiO2)

Lapis Lazuli

Lazurite-dominant rock, (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2

River Quartzite (River Rock)

Quartzite (SiO2)

Quartzite (River Pebble)

Meta-quartzite (composed primarily of SiO2)

Quartzite

Quartzite (SiO2)

Black Marble

Recrystallized Calcite (CaCO3)

Yellow Quartzite (River Pebble)

Quartzite (mainly SiO2)

Green Aventurine

Silicon Dioxide (Quartz) with inclusions of Fuchsite mica; Chemical formula: SiO2 + K(Al,Cr)2AlSi3O10(OH)2

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (SiO2)

Serpentine (Serpentinite)

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

Gneiss (Granitic Gneiss)

Gneiss (from German Gneis, related to 'spark')

Anthracite Coal

Anthracite (Carbon Content: 86%–98%)

Marble (Sculculpted)

Metamorphosed Limestone (primarily CaCO3)

Nephrite Jade

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

Ruby in Fuchsite (often confused with Ruby in Zoisite)

Corundum (Al2O3) in Chromium-rich Muscovite (KAl2(AlSi3O10)(OH)2)

Jade (Nephrite)

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

Quartzite with Quartz Veining

Quartzite (primarily SiO2)

Schist

Mica Schist

Quartzite Pebble

Quartzite (SiO2)

River Pebble (Likely Quartzite or Gneiss)

Metamorphosed Silicate Rock (primarily SiO2)

Quartzite

Quartzite (primarily SiO2)