Metamorphic (Likely Gneiss Or Schist Based On Texture)

Banded River Rock / Gneiss (highly weathered)

Gneiss

Weathered metamorphic rock, likely gneiss or schist

Indeterminate foliated silicate rock; commonly quartz–feldspar–mica assemblage

Garnet (likely Almandine or Pyrope)

Garnet Group, Nesosilicates (Complex chemistry, e.g., Almandine: Fe3Al2Si3O12)

Banded gneiss

Gneiss, commonly quartz–feldspar–mica bearing

Green Fuchsite and Quartz

K(Al,Cr)2(AlSi3O10)(OH)2 (Chromium-rich Muscovite)

Garnet

Garnet Group (e.g., Almandine, Pyrope)

Feldspathic Gneiss

High-grade Metamorphic Rock (Gneiss)

Quartz vein in foliated metamorphic rock

Milky quartz (SiO₂) in likely schist or gneiss

Schist

Mica Schist

Gneiss

Banded gneiss; typically quartz–feldspar–mica assemblage

Muscovite Mica (with Quartz)

Muscovite (KAl2(AlSi3O10)(OH)2)

Banded gneiss

Gneiss, commonly quartz–feldspar–biotite gneiss

Biotite (Black Mica)

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

Gneiss (High-Grade Metamorphic Rock)

Gneiss (primarily composed of Quartz, Feldspar, and Mica/Amphiboles)

Blue Kyanite

Kyanite (Al2SiO5)

Banded Gneiss

Gneiss (Metamorphic rock of variable mineralogy, often quartz-feldspar base)

Biotite-rich gneiss (possibly mica schist)

Quartz–feldspar–biotite gneiss; mica-rich metamorphic rock

Garnet in Schist or Pegmatite

Almandine Garnet (Fe3Al2(SiO4)3) in host rock

Garnet

Garnet Group (Silicate Minerals), formula varies e.g., Alm: Fe3Al2(SiO4)3

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Fuchsite (Chrome Mica)

Cr-bearing Muscovite - K(Al,Cr)2(AlSi3O10)(OH)2

Quartz with Schist Inclusion

Quartz (SiO2) with micaceous schist inclusions

Garnet-Mica Schist

Garnetiferous Porphyroblastic Schist

Foliated metamorphic rock, likely mica schist

Mica schist, chiefly quartz + biotite/muscovite; possibly chlorite-bearing

Banded gneiss

Gneiss, commonly quartz–feldspar–mica gneiss

Mica Schist

Mica Schist (predominantly Muscovite/Biotite)

Likely polished/tumbled garnet

Garnet-group silicate, likely almandine–pyrope solid solution; approximate formula Fe₃Al₂(SiO₄)₃–Mg₃Al₂(SiO₄)₃

Weathered metamorphic boulder, likely schist or gneiss

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

Banded metamorphic rock, likely mica schist or gneiss

Mica schist/gneiss, chiefly quartz, feldspar, biotite and muscovite

Biotite-rich schist (likely graphite schist)

Mica schist; chiefly biotite, with quartz and feldspar, possibly graphite

Vein-bearing metamorphic rock, likely gneiss or schist

Quartz-feldspar–mica metamorphic rock; exact identification requires testing

Polished dark green stone, likely serpentinite or chlorite schist

Serpentinite (Mg-rich serpentine minerals, commonly antigorite/lizardite) or chlorite-rich schist

Kyanite (within Quartz)

Kyanite (Al2SiO5) in crystalline Quartz base (SiO2)

Banded Gneiss

Gneiss

Feldspar

KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8 (Feldspar group)

Likely foliated metamorphic rock (quartz-mica schist or gneiss)

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

Gneiss (or Granite Gneiss)

Metamorphic rock rich in quartz, feldspar, and biotite/amphibole

Muscovite Mica in Quartz Matrix

Muscovite (KAl2(AlSi3O10)(OH)2) in Quartz (SiO2)

Biotite Mica in Host Rock

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

Biotite / Black Mica

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

Weathered quartz-bearing metamorphic rock, likely mica schist or gneiss

Quartz–feldspar–mica schist/gneiss; exact identification is limited by the blurred image

Garnet ring

Likely almandine or pyrope garnet, an Fe–Mg–Al silicate in the garnet group; exact identity cannot be confirmed visually