Metamorphic

Quartz vein in Host Rock

Crystalline Silicon Dioxide (SiO2) in Lithic Matrix

Garnet Schist or Garnet-bearing Quartzite

Metamorphic rock containing Almandine Garnet (Fe3Al2(SiO4)3) and Quartz (SiO2)

Quartzite

SiO2 (Silicon Dioxide)

White Marble

Recrystallized Calcite (CaCO3)

Mica Schist

Mica Schist (predominantly Muscovite or Biotite sheet silicates)

Marble

Metamorphosed Limestone (calcite formulation CaCO3)

Schist

Mica Schist (Variable chemistry, often rich in muscovite and biotite)

Mica Schist

Mica Schist (Composition typically contains Muscovite: KAl2(AlSi3O10)(OH)2 or Biotite: K(Mg,Fe)3AlSi3O10(OH)2 along with Quartz and Feldspar)

Kyanite (within Quartz)

Kyanite (Al2SiO5) in crystalline Quartz base (SiO2)

Emerald in Schist (Raw/Tumbled)

Beryllium Aluminum Silicate (Be3Al2Si6O18) with Chromium/Vanadium impurities in Mica Schist

Green Aventurine

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

Nephrite Jade

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

Mica Schist

Mica Schist (contains Muscovite/Biotite, Quartz)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)

Dalmatian Stone

Dalmatian Jasper (a misnomer) / Perthitic Igneous Rock

Schist

Schist (primarily mica-schist)

Schist

Mica Schist

Quartzite

Quartzite (primarily SiO2)

Red Quartzite

Quartzite (primarily SiO2)

Metagabbro / Epidote Gneiss

Epidote bearing Hornblende Gneiss

Quartzite

Quartzite (primarily Silicon Dioxide, SiO2)

Quartzite

Quartzite (SiO2)

Nuummite

Orthoamphibole (mixture of Anthophyllite and Gedrite)

Mica Schist

Mica Schist

Garnet (Almandine)

Almandine (Fe3Al2(SiO4)3)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Bull Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Red Garnet (Pyrope or Almandine)

Magnesium aluminum silicate (Mg3Al2(SiO4)3) or Iron aluminum silicate (Fe3Al2(SiO4)3)

Milky Quartz (with trace inclusions)

Silicon Dioxide (SiO2)

Green Kyanite

Kyanite (Al2SiO5)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Mica-rich Pegmatite

Pegmatite (rich in Muscovite and Biotite)

Milky Quartz with Chlorite/Moss Infusions

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Marble

Recrystallized Calcite (CaCO3)

Greenschist (Chlorite Schist)

Greenschist (containing chlorite, actinolite, and epidote)

Anthracite Coal

Anthracite (Carbon-based organic sedimentary/metamorphic rock)

Shungite

Non-crystalline carbon (high-carbon metamorphic rock)

Coal (Anthracite)

Anthracite (Carbon-based organic sedimentary/metamorphic rock)

Quartzite with Iron Inclusions

Metamorphic Silicon Dioxide (SiO2) with impure Limonite/Hematite

Mica Schist

Medium-grade regional metamorphic rock (composition varies)

Schist

Mica Schist (Group of medium-grade metamorphic rocks)