Metamorphic Rock

Dark garnet-bearing metamorphic rock (probable garnet schist/amphibolite)

Garnet schist or garnet amphibolite; chiefly quartz, mica/amphibole, feldspar, and almandine–pyrope garnet

White quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly crystalline SiO₂, possibly micaceous or feldspathic

Coarse-grained gray metamorphic rock, likely gneiss or granitic gneiss

Quartz–feldspar–mica gneiss; exact identification requires petrographic or chemical testing

Biotite-bearing metamorphic rock, likely schist

Mica schist; quartz–feldspar–biotite assemblage

Weathered quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly microcrystalline quartz (SiO₂), with minor iron-oxide staining and possible feldspar or mica

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly quartz (SiO₂), with minor feldspar, mica, and iron-oxide staining

Foliated metamorphic rock, likely slate or phyllite

Fine-grained metapelite; commonly quartz–mica–chlorite with possible graphite

Quartz-rich metamorphic rock, likely quartzite

Quartzite, composed predominantly of quartz (SiO₂), with dark biotite, amphibole, or iron-oxide inclusions

Weathered quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly quartz (SiO₂), with minor iron-oxide staining and possible mica/clay minerals

Weathered gray metamorphic rock, likely phyllite or slate

Micaceous quartz–phyllosilicate rock; commonly quartz + muscovite/illite ± chlorite

Weathered quartz-rich metamorphic rock, likely quartzite

Quartzite (mostly SiO₂), possibly micaceous quartzite or quartz-rich schist

Mica-rich metamorphic rock, likely schist

Biotite–muscovite schist, possibly garnet-bearing

Quartz-bearing metamorphic rock, likely garnet-mica schist

Quartz–mica schist with probable garnet and iron-oxide minerals

Quartz-veined metamorphic rock, likely greenschist or altered basalt

Chlorite–actinolite schist or metabasalt with a milky quartz vein

Copper-bearing metamorphic rock, likely bornite- or chalcopyrite-rich schist

Quartz–mica schist with disseminated copper sulfides; possible bornite (Cu₅FeS₄) and chalcopyrite (CuFeS₂)

Quartz-rich metamorphic rock, likely mica schist or quartzite

Quartz (SiO₂) with probable mica, feldspar, and dark accessory minerals

Weathered quartz-rich metamorphic rock, likely quartzite

Quartzite, predominantly microcrystalline quartz (SiO₂), with iron-oxide staining and dark mica or amphibole inclusions

Weathered iron-rich metamorphic rock, likely banded iron formation or ferruginous quartzite

Quartz–iron oxide rock; chiefly SiO₂ with hematite (Fe₂O₃), magnetite (Fe₃O₄), and minor limonite/goethite

Likely quartz-rich metamorphic rock (quartzite)

Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with feldspar or mica impurities

Foliated metamorphic rock, likely mica schist

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

Quartz-rich metamorphic rock, likely quartzite

Quartzite, composed predominantly of quartz (SiO₂), with minor iron-oxide staining and possible feldspar/mica

Quartz-veined metamorphic rock, likely mica schist

Mica schist with a milky-quartz vein; predominantly quartz, feldspar, and biotite/muscovite mica

Likely garnet-bearing metamorphic rock

Garnet schist or garnet amphibolite; garnet-group silicate, commonly almandine (Fe₃Al₂Si₃O₁₂)

Quartz-rich metamorphic rock (likely quartzite)

Quartzite; predominantly crystalline quartz (SiO₂), possibly with mica or feldspar impurities

Dark mafic metamorphic rock, likely amphibolite

Amphibolite; chiefly hornblende amphibole + plagioclase feldspar

Dark metamorphic rock, likely schist or amphibolite

Biotite–quartz schist / amphibolite (tentative; image alone is insufficient for exact identification)

Weathered quartz-rich metamorphic rock, possibly quartzite

Quartzite (predominantly SiO₂), with iron-oxide staining and minor accessory minerals

Dark gray metamorphic rock fragment, likely slate or schist

Fine-grained foliated silicate rock; composition likely quartz, feldspar, mica, and/or chlorite

Banded gneiss or banded metamorphic rock

Gneiss, likely quartz–feldspar–biotite gneiss

Quartz-rich metamorphic rock, likely quartzite

Quartzite (mostly crystalline SiO₂), possibly quartz-rich schist or vein quartz

Weathered quartz-rich metamorphic rock, possibly quartzite

Quartzite (SiO₂-rich metamorphic rock), with probable feldspar, mica, and iron-oxide staining

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly crystalline SiO₂, with possible iron-oxide and dark mica/mineral inclusions

Mica-rich metamorphic rock, likely schist

Muscovite- or biotite-bearing schist; composition commonly quartz + mica ± feldspar

Quartz-rich metamorphic rock, likely quartzite

Quartzite (mostly microcrystalline quartz, SiO₂), possibly mica-bearing

Dark green metamorphic rock, likely serpentinite

Serpentinite, composed mainly of serpentine-group minerals (antigorite, lizardite, or chrysotile), commonly with magnetite and minor chlorite/talc

Quartz–mica metamorphic rock, likely schist

Quartz–muscovite/biotite schist; predominantly SiO₂ quartz with phyllosilicate micas

Weathered quartz-rich metamorphic rock (probable quartzite)

Quartzite; predominantly microcrystalline quartz (SiO₂), with possible mica, feldspar, and iron-oxide impurities

Weathered quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly microcrystalline quartz (SiO₂), with possible feldspar, mica, and iron-oxide staining

Quartz-rich metamorphic rock, likely quartzite

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

Uncertain gray metamorphic rock, likely gneiss or schist

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

Veined quartz-bearing metamorphic rock

Likely quartzite or siliceous schist with iron-oxide staining

Quartz-rich metamorphic rock, likely quartzite

Quartzite (predominantly quartz, SiO₂); identification is tentative from the image