Igneous Or Metamorphic

Pink Quartzite

Quartzite (SiO2 with iron oxide impurities)

Quartzite

Quartzite (primarily SiO2)

Green Aventurine

Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2

Quartzite

Quartzite (SiO2)

Orange Quartzite / Carnelian Agate

Silicon Dioxide (SiO2)

Quartzite

Quartzite (mostly SiO2)

Quartzite

Quartzite (primarily SiO2)

Mica Schist

Mica Schist (KAl2(AlSi3O10)(OH)2 - Muscovite component)

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)

Marble

Recrystallized Calcite (CaCO3)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Green Kyanite

Kyanite (Al2SiO5)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

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)

Slate

Metamorphosed Shale (Fine-grained Foliated Metamorphic Rock)

Schist (Biotite/Mica Schist)

Medium-grade regional metamorphic rock (rich in Phyllosilicates)

Blue Kyanite

Kyanite (Al2SiO5)

Green Aventurine

Quartzite with Fuchsite (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)

Quartzite

Quartzite (SiO2)

Rough Nephrite Jade

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

Yellow Quartzite (or Quartz River Pebble)

Silicon Dioxide (SiO2)

Yellow Quartzite (Orange Quartzite)

Silicon Dioxide (SiO2) with iron oxide staining

Milky Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Quartz (Milky or Cloudy variety)

Silicon Dioxide (SiO2)

Orange Aventurine (Sunstone-style Quartzite)

Silicon Dioxide (SiO2) with Goethite or Hematite inclusions

Green Aventurine (Fuchsite-bearing Quartz)

Silicon Dioxide with Chromium-rich Muscovite (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite

Nuummite

Nuummite (Orthorhombic amphiboles: Anthophyllite and Gedrite)

Quartzite

Quartzite (SiO2 silicon dioxide)

Green Quartzite (Aventurine-like)

Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)

Quartzite Pebble (Beach Stone)

Quartzite (primarily SiO2)

Quartzite (River Cobble)

Quartzite (Metamorphosed Quartz Sandstone, SiO2)

Quartzite (Ferruginous)

Recrystallized Quartz (SiO2) with Iron Oxide inclusions

Quartzite (or Milky Quartz pebble)

Quartzite (Metamorphosed Sandstone) / Silicon Dioxide (SiO2)