Metamorphic (Likely Gneiss Or Schist Based On Texture)

Banded gneiss

Gneiss, likely quartz–feldspar–biotite gneiss

Mica Schist

Mica Schist (primarily Muscovite or Biotite sheet silicates)

Probable mica schist

Schist, likely muscovite–biotite schist

Mica Schist

Schist (muscovite-biotite schist)

Banded gneiss cobble

Gneiss, commonly quartz–feldspar–biotite gneiss

Schist

Schist

Fuchsite

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

Biotite on Quartz

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

River Pebbles (Mixed Lithology)

Conglomerate clasts (Silica-rich and Metamorphic assemblages)

Tumbled orbicular granite or granitic gneiss

Granite, chiefly quartz–feldspar–biotite/amphibole; exact variety uncertain from the image

Mica Schist

Mica Schist (primarily Muscovite and Quartz)

Schist

Schist (Crystalline Metamorphic Rock)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Banded Gneiss (with Quartz Vein)

Gneiss (SiO2 and varied Silicates)

Banded metamorphic rock, likely banded gneiss

Gneiss, probably biotite–quartz–feldspar gneiss

Gneiss (specifically a Banded Gneiss pebble)

Gneiss (High-grade Regional Metamorphic Rock)

Biotite Mica

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

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Likely biotite-rich schist (mica schist)

Mica schist, chiefly quartz + biotite mica (K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂), possibly with muscovite and feldspar

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(F,OH)2)

Muscovite

Muscovite (KAl2(AlSi3O10)(OH)2)

Graphite

Graphite (Native Carbon, C)

Muscovite Mica

KAl2(AlSi3O10)(OH)2

Granitic Gneiss

Gneiss (Polymetamorphic Granitic Gneiss)

Schist

Mica Schist

Schist

Mica Schist (primarily Muscovite or Biotite sheet silicates)

Tumbled metamorphic pebble, likely gneiss

Foliated gneiss; commonly quartz, feldspar, mica, and amphibole

Schist

Schist (Crystalline metamorphic rock)

Biotite-bearing gneiss (probable)

Foliated metamorphic rock composed chiefly of quartz, feldspar, and dark biotite/amphibole

Schist

Mica Schist

Muscovite Mica

Muscovite [KAl2(AlSi3O10)(OH)2]

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Biotite Mica

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

Unidentified gray metamorphic rock, likely schist or gneiss

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

Weathered quartz-rich metamorphic rock, likely gneiss or schist

Quartz–feldspar–mica gneiss/schist (tentative; image resolution limits certainty)

Likely chlorite-bearing schist (possibly greenschist)

Chlorite–quartz–mica schist; commonly contains muscovite/biotite and feldspar

Biotite or Phlogopite Mica

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

Uncertain gray metamorphic rock, likely gneiss or schist

Quartz–feldspar–mica rock; exact identification requires close examination

Schist

Mica Schist (Metamorphic Rock)

Muscovite

Muscovite, KAl2(AlSi3O10)(OH)2

Fuchsite

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

Granitic Gneiss

Gneiss (High-grade Metamorphic Rock)