Industrial Byproduct (Often Confused With Igneous Rocks Or Meteorites)

Orange Calcite

Calcium Carbonate (CaCO3)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Labradorite

Feldspar (variety of Anorthite), (Ca,Na)(Al,Si)4O8

Citrine (Yellow Quartz)

Silicon Dioxide (SiO2)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Labradorite

Labradorite ((Ca, Na)(Al, Si)4O8)

Moonstone

Potassium Aluminum Silicate (KAlSi3O8)

Sunstone

Plagioclase feldspar (with Copper or Hematite inclusions)

Amethyst (Quartz variety)

Silicon Dioxide (SiO2)

Labradorite

Labradorite ((Ca, Na)(Al, Si)4O8)

Carnelian

SiO2 (Silicon Dioxide) with Iron Oxide impurities

Quartzite

Quartzite (primarily SiO2)

Citrine Quartz carving

Silicon Dioxide (SiO2)

Mica Schist

Metamorphic rock dominated by muscovite and/or biotite mica

Quartz (in matrix)

Quartz (SiO₂)

Serpentine

Serpentinite (complex of Mg, Fe, Ni, Al, Zn, Mn)Si2O5(OH)4

Lepidolite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

Emerald

Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities

Labradorite (a variety of Feldspar)

Labradorite; (Na,Ca)(Al,Si)4O8 (a plagioclase feldspar)

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

White Topaz

Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)

Granite

Granite (a felsic intrusive igneous rock)

Quartzite

Quartzite (SiO2)

Yellow Quartz (Citrine or Yellow Jasper)

Silicon Dioxide (SiO2)

Coquina or Fossiliferous Sandstone

Fossiliferous Calcarenite (CaCO3 with SiO2 inclusions)

Migmatite

Migmatite (Mixed metamorphic-igneous rock)

Quartz Geode (with Calcite influence)

Silicon Dioxide (SiO2) with possible Calcium Carbonate (CaCO3)

Milk Quartz (White) and Yellow Aventurine (Yellow)

Silicon Dioxide (SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartz

Silicon Dioxide (SiO2)

Gneiss

Gneiss (High-grade metamorphic rock)

Serpentine

Antigorite, Lizardite, and Chrysotile (Mg3Si2O5(OH)4)

Mica (likely Muscovite)

Muscovite / KAl2(AlSi3O10)(OH)2

Rose Quartz

Silicon dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Gneiss

Gneiss (SiO2-rich metamorphic rock)

Smoky Quartz

Silicon Dioxide (SiO2)

Quartzite

Metamorphic Quartzite (SiO2)

Quartzite (Iron-stained)

Metamorphic Quartzite (primarily SiO2) with Limonite/Hematite staining

Quartzite

Quartzite (primarily SiO2)

Quartzite (clastic/metamorphic subtype)

Quartzite (primarily Silicon Dioxide, SiO2)