Mineral, Often Found In Metamorphic Rocks But Also In Sedimentary And Igneous Rocks

Gneiss

Gneiss

Orange Calcite

Calcium Carbonate (CaCO3)

Pyrite

Pyrite (Iron Disulfide), FeS2

Gneiss

Gneiss

Smoky Quartz

Silicon Dioxide (SiO2)

Blue Kyanite

Kyanite (Al2SiO5)

Pyrite

Iron Disulfide (FeS2)

Sodalite

Sodalite [Na8(Al6Si6O24)Cl2]

Hematite

Iron(III) oxide (Fe2O3)

Quartz / Rock Crystal

Silicon Dioxide (SiO2)

Amethyst

Quartz (SiO2) variety

Chalcedony (Common Opal or Agate variant)

Silicon Dioxide (SiO₂)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Brown Agate

Silicon Dioxide (SiO2)

Pyrite on Quartz

Iron Sulfide (FeS2) on Silicon Dioxide (SiO2)

Greenschist

Greenschist facies rock (containing chlorite, actinolite, albite, and epidote)

Blue Calcite

Calcium Carbonate (CaCO3)

Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Chalcedony

Silicon Dioxide (SiO₂)

Garnet Schist

Almandine Garnet Schist

Blue Kyanite

Kyanite (Al2SiO5)

Yellow Calcite

Calcium Carbonate (CaCO3)

Quartz (Pebble)

Quartz (SiO₂)

Peridot and Citrine Gemstones (in a ring setting)

Peridot (Olivine: (Mg,Fe)2SiO4), Citrine (Quartz: SiO2)

Labradorite

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

Epidote

Epidote - Ca2(Al,Fe)3(SiO4)3(OH)

Kyanite

Kyanite (Al2SiO5)

Gneiss (Pebble)

Gneiss

Sodalite

Sodalite (Na4Al3Si3O12Cl)

White Moonstone (Scolicite or White Feldspar var. )

Lattice-structure Silicate (KAlSi3O8)

Amazonite

K(AlSi3O8) - Lead-bearing Microcline (Tectosilicate)

Smoky Quartz

Silicon Dioxide (SiO2)

Citrine

Silicon Dioxide (SiO2) with ferric iron impurities

Quartz

Silicon Dioxide (SiO₂)

Biotite Mica in Quartz

Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2) in Quartz (SiO2)

Chalcopyrite

Chalcopyrite (CuFeS2)

Shale (with Iron Oxide staining)

Fissile Mudstone (primarily Quartz and Clay minerals)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Blue Sapphire (Tumbled/Polished)

Corundum (Al2O3)

Calcite

Calcite (CaCO3)

Blue Chalcedony

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz