Metamorphic (Likely Gneiss Or Schist Based On Texture)

Dark metamorphic rock, likely slate or phyllite

Foliated metapelite; commonly mica-rich quartz–clay mineral assemblage

Schist

Mica Schist

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Gneiss (Granitic Gneiss)

Gneiss (from German Gneis, related to 'spark')

Schist

Mica Schist (formula variable based on mineral content, typically containing [K,Al,Fe,Mg,Si,O,H])

Muscovite Mica

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

Quartz Vein in Mica Schist

Quartz (SiO2) with Muscovite/Biotite Schist

Schist

Mica Schist

Quartz with Mica (Schist/Pegmatite fragment)

Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(OH)2)

Muscovite mica (mica schist fragment)

Muscovite, KAl₂(AlSi₃O₁₀)(OH)₂; possibly intergrown with quartz and feldspar

Muscovite Mica

KAl2(AlSi3O10)(OH)2

Weathered foliated metamorphic rock, likely gneiss or schist

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

Dark coarse-grained metamorphic rock, likely amphibolite or hornblende schist

Amphibolite, dominated by hornblende amphibole and plagioclase feldspar; exact identification requires testing

Mica Schist

Mica Schist (primarily Muscovite or Biotite sheet silicates)

Gneiss or Schist

Gneiss or Mica Schist with Garnet

Mica Schist

Mica Schist

Likely foliated metamorphic rock (schist or gneiss fragment)

Mica schist–gneiss; chiefly quartz, feldspar, and mica

Mica Schist

Mica Schist (Silicate rock)

Banded Gneiss

Gneiss (complex metamorphic silicate rock)

Weathered rock fragment, possibly granite or metamorphic stone

Indeterminate; likely quartz–feldspar–mica aggregate (granite-like), but image resolution prevents reliable identification

Blue-gray metamorphic rock, likely gneiss or schist

Quartz–feldspar–mica assemblage; exact identification requires testing

Gneiss

Metamorphic Rock (Gneissic texture)

Likely weathered schist or gneiss fragment

Micaceous quartz-feldspar metamorphic rock; exact identification requires testing

Gneiss

Gneiss (High-grade regional metamorphic rock)

Gneiss (Granitic Gneiss)

Gneiss

Muscovite Mica (likely on Quartz/Feldspar)

Muscovite - KAl2(AlSi3O10)(OH)2

Banded Gneiss

Gneiss (Metamorphic Rock)

Possibly biotite-rich mica schist or weathered mafic rock

Mica schist; chiefly biotite mica, quartz, and feldspar

Weathered gray metamorphic rock, likely gneiss or schist

Probable quartz–feldspar–mica gneiss/schist; exact identification requires a fresh surface and tests

Mica Schist

Mica Schist (predominantly Muscovite or Biotite sheet silicates)

Schist

Mica Schist (primarily composed of quartz, feldspar, and mica)

Biotite schist

Mica schist; chiefly quartz, feldspar, and biotite mica

Epidote

Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Schist

Schist

Garnet (Pyrope or Almandine)

Silicate (X3Y2Si3O12)

Schist

Schist (primarily mica-schist)

Dark metamorphic rock, likely schist or gneiss

Mica schist/gneiss; commonly quartz + feldspar + biotite, with possible amphibole

Muscovite Mica

KAl2(AlSi3O10)(OH)2

Banded gneiss (likely biotite-rich gneiss)

Gneiss; chiefly quartz, feldspar, biotite, and possibly hornblende

Gneiss

Feldspathic biotite gneiss; a high-grade metamorphic rock composed mainly of quartz, feldspar, and mica

Banded gneiss

Foliated silicate rock, typically quartz–feldspar–mica gneiss

Muscovite Mica

KAl2(AlSi3O10)(F,OH)2