Mineral In Metamorphic Rock

Weathered foliated metamorphic rock, likely schist or phyllite

Micaceous quartz–feldspar schist/phyllite; exact identification requires microscopy or testing

Likely raw garnet-bearing metamorphic rock

Garnet schist or garnet amphibolite; probable almandine garnet (Fe₃Al₂Si₃O₁₂)

Schist (likely Mica Schist)

Mica Schist

Gneiss

Gneiss (Metamorphic Rock)

Foliated metamorphic rock, likely schist

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

Zebra Jasper (with Chlorite/Epidote)

Silicon Dioxide (SiO2) with inclusions

Serafina (Serafinite / Clinochlore)

Clinochlore (Mg5Al)(AlSi3O10)(OH)8

Garnet Schist

Almandine Garnet Schist (Fe3Al2(SiO4)3 in Schistose matrix)

Likely foliated metamorphic rock, possibly schist

Mica schist or micaceous quartzite; exact identification is uncertain from the photograph

Gneiss (with Quartz Vein / Pegmatite Banding)

Metamorphic Gneiss

Schist

Schist (Metamorphic Rock)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Quartz-bearing metamorphic rock, likely quartzite

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

Epidote

{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)

Greenstone (likely metamorphosed basalt)

Metabasalt/greenstone; commonly composed of chlorite, actinolite, epidote, albite, and quartz

White mica schist

Muscovite–quartz schist; predominantly muscovite mica (KAl₂(AlSi₃O₁₀)(OH)₂) and quartz (SiO₂)

Dark foliated metamorphic rock, likely amphibolite

Amphibolite, typically composed mainly of hornblende and plagioclase feldspar

Rounded, banded metamorphic cobble

Likely gneiss or foliated quartz-rich metamorphic rock; exact identification is uncertain from the photograph.

Fuchsite

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

Unidentified dark, foliated metamorphic rock

Likely biotite schist or hornblende-bearing gneiss; exact identification requires testing

Quartz Vein in Metamorphic Rock

Quartz-veined Schist or Gneiss

Green aventurine / epidote-bearing metamorphic rock

Likely chlorite- and epidote-rich schist or altered amphibolite; exact identification requires testing

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

Granitic Gneiss

Gneiss (Metamorphic Rock)

Coarse-grained gray metamorphic rock, likely gneiss

Biotite–quartz–feldspar gneiss (probable)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Likely schist, possibly serpentinite

Mica schist; potential chlorite–serpentine-rich metamorphic rock

Garnet in Schist (Mica Schist with Garnet Inclusion)

Garnetiferous Mica Schist (X3Al2(SiO4)3)

Likely garnet-bearing metamorphic rock

Garnet-mica schist or amphibolite; probable garnet-group mineral (X3Y2(SiO4)3) with mica/amphibole

Banded Gneiss Pebble

Gneiss (Metamorphic Rock)

Likely pyrite-bearing metamorphic rock

Quartz–mica schist or phyllite with disseminated pyrite (FeS₂)

Gravel / Crushed Stone

Aggregate (mixed mineral rock fragments)

Weathered quartz-rich metamorphic rock, possibly quartzite

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

Weathered micaceous metamorphic rock, likely schist or phyllite

Quartz–mica schist/phyllite; commonly quartz, muscovite/biotite, and feldspar

Mica Schist

Mica Schist (primarily Muscovite or Biotite sheet silicates)

Tumbled garnet-bearing metamorphic rock (probable garnet schist)

Garnet schist; chiefly quartz, mica, feldspar, and almandine garnet (Fe₃Al₂Si₃O₁₂)

Dark gray crystalline rock, possibly mica-rich schist or graphite-bearing gneiss

Indeterminate; likely quartz–feldspar–mica metamorphic rock

Pyrite

Iron Disulfide (FeS2)

Quartzite

Quartz-rich metamorphic rock; chiefly SiO₂

Weathered schist

Mica schist, typically quartz–mica schist

Dark metamorphic rock, likely schist or slate fragment

Indeterminate foliated metamorphic rock; possibly mica schist or slate

Slate

Foliated Metamorphic Rock (composed of quartz, illite, chlorite)