Metamorphic

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals, Mg3Si2O5(OH)4)

Quartzite

Metamorphosed Sandstone (SiO2 - Silicon Dioxide)

Quartzite

Quartzite (primarily SiO2)

Unakite

Unakite Lepidolite

Gneiss (Granitic Gneiss)

Gneiss

Anthracite Coal

Anthracite

Anthracite Coal

Anthracite (Carbon Content 86–97%)

Serpentinite (Serpentine Rock)

Primarily composed of serpentine group minerals, such as antigorite, chrysotile, and lizardite. Chemical formula for serpentine minerals is (Mg,Fe)3Si2O5(OH)4.

Lapis Lazuli

Lapis Lazuli (A metamorphic rock primarily composed of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, along with Calcite and Pyrite)

Serpentinite

Serpentinite (containing minerals of the Serpentine subgroup: Antigorite, Lizardite, and Chrysotile; formula (Mg,Fe)3Si2O5(OH)4)

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

Red Quartzite

Quartzite (SiO2)

Unakite

Unakite (Altered Granite)

Quartzite (River Siltstone variety)

Quartzite (SiO2)

Quartzite pebble

Quartzite (SiO2)

Quartzite Cobble

Quartzite (primarily SiO2)

Mica Schist

Mica Schist (primarily Muscovite or Biotite KAl2(AlSi3O10)(OH)2)

Lapis Lazuli (Low-grade/Calcite-heavy)

Na8[Al6Si6O24]n(S,Cl,SO4,OH)2 (Lazurite component)

Nephrite Jade

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

Quartzite

Meta-sandstone (mostly SiO2)

Green Aventurine

Quartzite (variety Aventurine) with Fuchsite inclusions (K(Al,Cr)2(AlSi3O10)(OH)2)

Quartzite pebble

Quartzite (SiO2)

Greenstone (Epidisite / Chlorite Schist)

Metabasalt (often contains Epidote Ca2Al2(Fe3+,Al)(SiO4)(Si2O7)O(OH) and Chlorite)

River Stone (Quartzite)

Metamorphosed Sandstone (SiO2)

Quartzite with Quartz Veining

Quartzite (primarily SiO2)

Unakite / Epidosite

Epidote with Orthoclase and Quartz; (Ca2(Al2,Fe)(SiO4)3(OH)) / (KAlSi3O8) / (SiO2)

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (primarily SiO2)

Orange Quartzite / Aventurine

Silicon Dioxide (SiO2)

Anthracite Coal

Anthracite (Carbon)

Lapis Lazuli

Lapis Lazuli (Complex silicate mixture)

Greenschist / Greenstone

Greenschist facies metabasite

Blue Quartzite

Quartzite with inclusions (often Dumortierite or Magnesio-riebeckite)

Red Quartzite

Quartzite (SiO2)

Greenstone

Greenschist (composed of actinolite, chlorite, and epidote)

Ruby in Fuchsite

Corundum (Al2O3) in Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)

Schist

Mica Schist (primarily consisting of muscovite KAl2(AlSi3O10)(OH)2 or biotite K(Mg,Fe)3(AlSi3O10)(OH)2)

Quartzite Pebbles

Quartzite (SiO2)

Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite mica

Schist

Mica Schist

Quartzite

Quartzite (primarily SiO2)

Quartzite (River Cobble)

Quartzite (SiO2)