Mineral In Metamorphic Rock

Foliated metamorphic rock, likely schist or gneiss

Quartz–mica schist/gneiss; exact identification requires close examination of mineral grains

Garnet-bearing metamorphic rock

Likely garnet schist or garnet-bearing mica schist; garnet is commonly almandine, Fe₃Al₂(SiO₄)₃

Gneiss

Gneiss (High-grade Metamorphic Rock)

Garnet Schist

Mica Schist with Almandine (Fe3Al2(SiO4)3)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Foliated metamorphic rock, likely biotite gneiss or schist

Biotite-rich gneiss/schist; chiefly quartz, feldspar, and biotite mica

Garnet-bearing metamorphic rock, possibly garnet amphibolite or mica schist

Almandine garnet (Fe₃Al₂Si₃O₁₂) in a mafic, amphibole–feldspar-rich matrix

Greenish metamorphic rock (possibly chlorite schist)

Chlorite-rich schist; exact identification is uncertain from the image

Mica Schist with Pyrite

Mica Schist (FeS2 containing)

Rough garnet-bearing rock, likely almandine garnet in matrix

Almandine garnet, Fe₃Al₂(SiO₄)₃; exact host rock cannot be determined from the image

Foliated metamorphic rock, likely garnet-mica schist

Mica schist, probably muscovite/biotite schist with small garnet or quartz inclusions

Small dark mineral or rock fragment

Indeterminate; possibly mica-rich schist, biotite, or a dark sulfide mineral

Granite with Epidote

Granite, containing quartz, feldspar, and epidote

Likely dark green-gray metamorphic pebble

Indeterminate; possibly chlorite schist, serpentinite, or amphibolite

Schist

Metamorphic Rock

Small banded metamorphic rock fragment

Indeterminate foliated metamorphic rock; possibly mica schist or gneiss

Dark metamorphic rock, possibly amphibolite

Amphibolite (tentative; commonly hornblende and plagioclase)

Quartzite

Metamorphic rock predominantly composed of Quartz (SiO2)

Slate

Slate (foliated metamorphic rock)

Pale-green schist fragment

Chlorite–sericite schist, possibly containing epidote or actinolite

Green Slate or Metamorphic Rock with Moss/Lichen

Metamorphic rock / Phyllite or Slate variant

Weathered, foliated metamorphic rock (likely schist or phyllite)

Probably mica-rich schist or phyllite; exact identification requires close examination of its grains and foliation

Mica Schist

Mica Schist (Quartz-Mica Metamorphic Rock)

Quartzite

Metamorphic Quartzite (SiO2)

Pyrite-bearing metamorphic rock (probable pyrite schist)

Schist containing pyrite (FeS₂), with probable quartz and mica

Weathered metamorphic rock, likely greenschist or amphibolite

Chlorite–actinolite schist/amphibolite; composition likely quartz, feldspar, chlorite, amphibole, and epidote

Quartz vein in foliated metamorphic rock

Likely quartz-bearing schist or gneiss; visible crystal is quartz (SiO₂)

Garnet-bearing Schist / Conglomerate Specimen

Metamorphic rock with almandine garnet porphyroblasts

Foliated metamorphic rock, likely biotite schist

Mica schist, chiefly quartz, feldspar, and biotite mica

Green Aventurine (Tumbled)

Silicon Dioxide with Fuchsite Inclusion (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)

Quartzite (or Engineered Quartz Stone)

SiO2 (Silicon Dioxide)

Quartzite

Metamorphic rock predominantly composed of Quartz (SiO2)

Quartz-veined metamorphic rock

Likely quartz-veined schist or gneiss; exact identification requires closer examination

Amphibolite

Amphibolite

Greenschist (or Serpentinite) with Quartz-Feldspar Vein

Metabasalt / Greenschist Facies Rock

Graphite-bearing metamorphic rock, likely graphitic schist

Graphitic schist; chiefly quartz, mica, feldspar, and graphite (C)

Likely micaceous metamorphic rock fragment

Probable phyllite or mica schist; quartz–muscovite-rich assemblage

Weathered foliated metamorphic rock, likely mica schist

Mica schist (likely quartz–muscovite/biotite schist; exact identification requires closer inspection)

Quartz-bearing metamorphic rock, possibly epidote/quartzite

Quartz-rich rock with possible epidote and feldspar; exact identification requires testing

Biotite-bearing metamorphic rock, possibly schist or gneiss

Mica schist/gneiss; chiefly quartz (SiO₂), feldspar, and biotite mica

Dark gray veined metamorphic rock

Likely marble or quartzite; exact identification requires hardness and acid tests

Mica Schist with Biotite or Muscovite

Metamorphic rock rich in sheet silicates