Metamorphic And Igneous

Quartzite

Quartzite (primarily SiO2)

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions (Quartzite)

Ruby in Fuchsite (often sold as Ruby in Zoisite)

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

Dragon Blood Jasper (Epidote with Piedmontite or Quartz)

Epidote-rich Quartzite / SiO2 with (Ca2(Al2,Fe)(Si2O7)(SiO4)O(OH))

Marble

Crystalline Limestone (mostly CaCO3 / Calcium Carbonate)

Green Aventurine

Aventurine Quartz (SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite (Yellow/Orange variety)

Quartzite (primarily SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (SiO2 silicon dioxide)

Quartzite

Quartzite (SiO2)

Anthracite Coal

Anthracite (Carbon-based organic sedimentary rock transitioned to metamorphic)

Quartz Vein with Host Rock (Greywacke/Siltstone)

Silicon Dioxide (SiO2) within Clastic Sedimentary/Metamorphic Matrix

Slate

Foliated Metamorphic Rock (primarily composed of quartz, illite, and chlorite)

Slate

Foliated Metamorphic Rock (primarily composed of quartz, illite, and chlorite)

Mica Schist

Mica Schist (Schistose metamorphic rock rich in Muscovite/Biotite)

Mica Schist

Mica Schist (predominantly Muscovite or Biotite sheet silicates)

Schist (Garnet-Mica Schist)

Garnetiferous Mica Schist (primarily Muscovite/Biotite and Almandine Garnet)

Almandine Garnet in Matrix

Almandine (Fe3Al2(SiO4)3)

Schist (Biotite Schist)

Biotite-bearing Schist (K(Mg,Fe)3AlSi3O10(F,OH)2)

Quartzite

Quartzite (primarily SiO2)

Unakite (Tumbled)

Unakite (altered granite)

K2 Jasper (K2 Granite)

Azurite in Granite (Al2Cu3(CO3)2(OH)2 in NaAlSi3O8)

White Marble

Calcite-rich Metasomatized Carbonate (CaCO3)

Quartzite

Quartzite (Primary mineral: Quartz, SiO2)

Fairy Stone (Staurolite Concretion)

Staurolite (Fe2+2Al9Si4O23(OH))

Blue Quartzite (Aventurine)

Quartzite (primarily SiO2) with inclusions of Dumortierite or Magnesio-riebeckite

Graphite

Graphite (Native Carbon, C)

Green Aventurine (Green Quartzite)

Silicon Dioxide (SiO2) with inclusions of Fuchsite mica

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Green Kyanite

Kyanite (Al2SiO5)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Agate

Agatized Chalcedony (SiO2)

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Green Aventurine

SiO2 (Quartz with Fuchsite inclusions)

Pyrite in Quartz

Iron Disulfide (FeS2) in Silicon Dioxide (SiO2)

Tiger's Eye

Silicon dioxide (SiO2) - Pseudomorph after crocidolite

Gold Ore (in Quartz/Pyrite)

Native Gold (Au) with Quartz (SiO2) and Pyrite (FeS2)

Yellow Jade

Jadeite or Nephrite (various silicates)

Black Onyx

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)