Metamorphic (Likely Gneiss Or Schist Based On Texture)

Drill Core Sample

Cylindrical Rock Core (Specific mineralogy varies by extraction site)

Gneiss

Gneiss (High-grade metamorphic rock)

Mica Schist

Schist (Muscovite-Quartz Schist)

Gneiss with Quartz Veining

Gneiss (High-grade Regional Metamorphic Rock)

Foliated metamorphic rock, likely mica schist

Muscovite- or biotite-bearing schist, commonly quartz–feldspar schist

Blue Kyanite

Kyanite (Al2SiO5)

Green Gneiss or Greenschist

Chlorite/Actinolite Gneiss or Schist

Red Garnet

Pyrope or Almandine (Silicate group, X3Y2(SiO4)3)

Likely schist

Mica schist, commonly quartz–muscovite/biotite schist

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with mica or iron-oxide impurities

Gneiss (Granitic Gneiss)

Gneiss

Schist

Schist

Gneiss

Gneiss

Kyanite (in Schist Matrix)

Kyanite (Al2SiO5)

Gneiss

Metamorphic Gneiss

Weathered foliated metamorphic rock, likely schist or gneiss

Mica schist to gneiss; commonly quartz + feldspar + biotite/muscovite

Banded gneiss

Foliated felsic gneiss, likely biotite–quartz–feldspar gneiss

Banded metamorphic rock, likely mica schist

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

Banded gneiss

Gneiss, commonly quartz–feldspar–mica gneiss

Banded Gneiss

Gneiss (Metamorphic Rock)

Muscovite Mica in Quartz

Potassium Aluminum Silicate Hydroxide (KAl2(AlSi3O10)(OH)2) and Silicon Dioxide (SiO2)

Banded gneiss

Gneiss, likely biotite–quartz–feldspar gneiss

Mica

Phyllosilicate (group name), typically Muscovite KAl2(AlSi3O10)(OH)2 or Biotite K(Mg,Fe)3(AlSi3O10)(OH)2

Banded gneiss

Gneiss, likely quartz–feldspar–mica gneiss

Weathered gray metamorphic rock, likely gneiss or schist

Quartz–feldspar–mica assemblage; exact identification requires a fresh surface or testing

Muscovite Mica

KAl2(AlSi3O10)(OH)2

Likely biotite schist or mica-rich metamorphic rock

Mica schist, predominantly biotite mica with quartz and feldspar

Quartz with Mica (likely Muscovite)

Silicon Dioxide (SiO2) with Potassium Aluminum Silicate Hydroxide Fluoride

Banded gneiss

Gneiss, commonly quartz–feldspar–mica gneiss

Mica Schist

Mica Schist (Quartz-Biotit-Muscovite Schist)

Foliated metamorphic rock, likely gneiss or mica schist

Quartz–feldspar–mica metamorphic rock; exact identification is uncertain from the photograph

Blue Kyanite

Kyanite (Al2SiO5)

Likely schist

Mica schist, commonly muscovite- or biotite-rich; exact identification requires testing

Mica Schist

Mica Schist

Banded Metamorphic Rock

Gneiss or Schist

Gray metamorphic rock, likely gneiss or schist

Quartz–feldspar–mica metamorphic rock; exact identification requires a fresh surface and tests

Schist

Mica Schist (predominantly Muscovite or Biotite)

Likely biotite-rich schist

Mica schist, chiefly quartz–biotite ± feldspar; exact identification requires testing

Likely biotite-rich schist or gneiss

Mica schist/gneiss; chiefly quartz, feldspar, and biotite mica

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Weathered gneissic metamorphic rock

Gneiss, likely quartz–feldspar–mica gneiss

Weathered schist

Mica schist, likely chlorite–biotite schist