Mineral In Metamorphic Rock

Green Aventurine

Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2

Milky Quartz

Silicon Dioxide (SiO2)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) in Altered Host Rock

Mica schist, likely biotite–muscovite schist

Mica schist; predominantly quartz, feldspar, biotite and/or muscovite mica. Exact mineral composition cannot be confirmed from the photograph alone.

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Gneiss

Gneiss (High-grade Metamorphic Rock)

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Magnetite

Magnetite (Fe3O4)

Garnet (Almandine)

Fe3Al2(SiO4)3

Serpentine

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

Lapis Lazuli

Na8(Al6Si6O24)S2 (Lazurite is the primary constituent mineral)

Unakite

Altered Granite (Orthoclase + Epidote + Quartz)

Milky quartz with iron-oxide staining

Quartz (silicon dioxide, SiO₂)

Schist (Biotite Schist)

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

Quartz

Silicon Dioxide (SiO2)

Yellow Aventurine

Quartz (SiO2) with inclusions

Magnetite

Magnetite (Fe3O4)

Gneiss

Gneiss (High-grade metamorphic rock)

Quartz

Silicon Dioxide (SiO2)

Quartz Vein in Host Rock (Likely Slate or Shale)

Hydrothermal Quartz (SiO2) in Pelitic host rock

Lapis Lazuli (Low-grade)

Lapis Lazuli (Aggregate of Lazurite, Calcite, and Pyrite)

Lapis Lazuli

Lapis Lazuli (Complex aggregate mainly of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Lapis Lazuli

Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Granite Gneiss

Gneiss (derived from granitic protolith)

Serpentinite

Serpentinite (composed primarily of minerals in the Serpentine group)

Serpentinite

Serpentinite (a rock composed predominantly of serpentine group minerals)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Amazonite

Microcline Feldspar (KAlSi3O8)

Greenstone (Prase / Nephrite / Serpentine mix)

Metamorphosed ultramafic rock / greenstone facies

Gold Ore

Native Gold (Au) in Quartz or Silicate matrix

Likely polished bronzite or serpentine-rich rock

Probable bronzite, an iron-bearing orthopyroxene (Mg,Fe)SiO₃; exact identification requires testing

Smoky Quartz

Silicon Dioxide (SiO2)

Milky Quartz with Iron Oxide Weathering

Silicon Dioxide (SiO2) with Goethite/Limonite coatings

Blue Kyanite

Kyanite (Al2SiO5)

Milky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

Quartz

Silicon dioxide (SiO2)

Tumbled quartz-rich stone, possibly blue quartz or granite

Quartz (SiO₂), with probable feldspar and dark accessory minerals

Greenstone

Metamorphic mafic rock (greenschist facies)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Unakite

Altered Granite (Granitic Metamorphic Rock)

Quartzite Pebble (with mineral veining)

Metamorphic Quartzite (SiO2)

Unakite or Epidosite

Epidosite (Mineral composition: Epidote, Feldspar, and Quartz)