Mineral In Metamorphic Rock

Schist

Schist (various mineralogical compositions including mica, chlorite, talc, etc.)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Gneiss

Granitic Gneiss

Red Aventurine

Quartz variety (SiO2 with Hematite/Goethite inclusions)

Quartzite with Hematite staining

Quartzite (SiO2) with iron oxide inclusions

Garnet

Almandine/Pyrope Garnet (Silicate Mineral Group)

Pyrite in Host Rock

Iron Disulfide (FeS2)

Biotite–quartz–feldspar gneiss

Gneiss, composed chiefly of quartz (SiO₂), feldspar, and dark mica, likely biotite

Quartzite (Yellow/Orange variety)

Quartzite (primarily SiO2)

Beach Pebble Quartzite / Chalcedony Pebble

Silicon Dioxide (SiO2)

Massive Quartz with Host Rock

Silicon Dioxide (SiO2)

Serpentine

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Granite Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Quartzite Pebble

Quartzite (SiO2)

Gneiss

Gneiss (High-grade metamorphic rock)

K-Feldspar (Microcline / Orthoclase)

Potassium Feldspar (KAlSi3O8)

Milky Quartz

Silicon Dioxide (SiO2)

Schist

Mica schist, likely muscovite–biotite schist with quartz and feldspar

Pyrite in Matrix (Quartz/Schist)

Iron Sulfide (FeS2)

Gneiss

Gneiss (High-grade Metamorphic Rock)

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

Granite Gneiss

Gneiss (High-grade metamorphic rock)

Polished river pebble, likely granite or granitic gneiss

Quartz–feldspar–mica aggregate; possibly biotite granite (compositionally near granite)

Gneiss (with Garnet)

Gneiss (Feldspar-Quartz-Biotite-Garnet Metamorphic Rock)

Lapis Lazuli

Lapis Lazuli (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2

Serpentine

(Mg,Fe)3Si2O5(OH)4

Banded Agate (Tumbled Chalcedony)

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Blue Sapphire (Tumbled/Polished)

Corundum (Al2O3)

Quartz Pebble with Hematite Inclusion

Silicon Dioxide (SiO2)

Mica Schist with Quartz

Crystalline Schist (SiO2 + KAl2(AlSi3O10)(OH)2)

Greenschist (containing Epidote and Quartz)

Greenschist (Epidote-Chlorite-Actinolite Schist)

Gneiss

High-grade regional metamorphic rock (Foliated)

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Gneiss

Gneiss (High-grade regional metamorphic rock)

Foliated Gneiss (River-Worn Pebble)

Gneiss (High-grade Regional Metamorphic Rock)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) in matrix

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Milky quartz-rich rock

Quartz (silicon dioxide, SiO₂), likely with mica or feldspar inclusions

Milky Quartz (with trace inclusions)

Silicon Dioxide (SiO2)

Green Quartz

Silicon Dioxide (SiO2)