Metamorphic Rock

Mica Schist

Foliated Metamorphic Rock (Schist)

Slate

Slate (Foliated Metamorphic Rock)

Phyllite

Phyllite (Foliated metamorphic rock)

Slate

Slate (foliated metamorphic rock)

Banded Gneiss with Quartz Vein

Foliated Metamorphic Rock (Gneiss)

Mica Schist

Foliated Metamorphic Rock (Schist)

Gneiss

Foliated Metamorphic Rock (Gneiss)

Slate

Slate (Foliated Metamorphic Rock)

Gneiss

Gneiss (foliated metamorphic rock)

Veined dark metamorphic rock, likely serpentinite

Serpentinite, predominantly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), with possible quartz, calcite, and magnetite veins

Foliated metamorphic rock, likely mica schist

Mica schist, chiefly quartz + biotite/muscovite; possibly chlorite-bearing

Coarse-grained metamorphic rock, likely gneiss or schist

Probable biotite-quartz-feldspar gneiss/schist; exact identification requires a fresh surface and tests

Weathered quartz-rich metamorphic rock, likely quartzite

Quartzite, predominantly crystalline SiO₂, possibly micaceous or feldspathic

Weathered quartz-rich metamorphic rock, possibly quartzite or vein quartz

Quartzite / massive quartz (SiO₂), identification uncertain from photograph

Weathered, iron-stained metamorphic rock (probable schist or gneiss)

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

Quartz-rich metamorphic rock, likely quartzite

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

Pyrite-bearing metamorphic rock (likely schist or gneiss)

Pyrite (FeS₂) in a quartz–mica-rich host rock

Likely pyrite-bearing metamorphic rock

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

Weathered quartz-rich metamorphic rock

Likely quartzite or quartz-veined schist; predominantly SiO₂ (quartz) with possible feldspar, mica, and iron-oxide minerals

Weathered mafic metamorphic rock, likely amphibolite or hornblende gneiss

Amphibolite; primarily hornblende amphibole and plagioclase feldspar, with possible biotite, quartz, and iron oxides

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly crystalline SiO₂, possibly with feldspar and mica impurities

Banded quartz-rich metamorphic rock (likely gneiss or quartzite)

Banded quartz–feldspar–mica rock; exact identification requires testing

Quartz-rich metamorphic rock, likely quartzite

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

Dark metamorphic rock, likely biotite schist or hornblende-bearing gneiss

Probable mica schist/amphibolite; composition may include biotite, amphibole, quartz, feldspar, and iron oxides

Likely mica-rich metamorphic rock (schist)

Muscovite–biotite schist; composition commonly quartz + feldspar + mica

Weathered quartz-rich metamorphic rock

Likely quartzite or quartz-rich gneiss; predominantly SiO₂ (quartz) with possible feldspar and mica

Uncertain dark metamorphic rock, likely schist or slate

Foliated silicate rock; possibly chlorite–mica schist or slate

Quartz–feldspar–mica metamorphic rock (likely gneiss)

Granitic gneiss; chiefly quartz (SiO₂), feldspar, and biotite/muscovite mica

Quartz-rich metamorphic rock, likely quartzite

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

Likely quartz-rich metamorphic rock fragment

Probable quartzite or quartz-bearing schist; exact identification is uncertain from the image

Banded metamorphic rock, likely gneiss

Foliated gneiss; chiefly quartz, feldspar, and dark mica/amphibole

Likely garnet-bearing metamorphic rock

Garnet-rich schist or gneiss; garnet is commonly almandine, Fe₃Al₂(SiO₄)₃

Schist

Schist (Crystalline metamorphic rock)

Schist

Schist (Crystalline Metamorphic Rock)

Mica Schist

Schist (Crystalline metamorphic rock)

Foliated metamorphic rock, likely marble or calc-schist

Calcite-rich marble/calc-schist; predominantly CaCO₃ (calcite), with possible mica and quartz

Blue-gray metamorphic rock, possibly slate or phyllite

Likely quartz–mica-rich phyllite/slate; exact identification requires testing

Dark metamorphic rock, likely hornfels or fine-grained basalt

Probable hornfels; commonly quartz–feldspar–mica with variable amphibole/pyroxene

Fine-grained dark metamorphic rock, likely slate or phyllite

Slate/phyllite, composed mainly of mica-group minerals, quartz, and clay-derived minerals

Iron-rich metamorphic rock, likely specular hematite-bearing schist

Hematite–quartz–mica schist (tentative)

Mica-bearing metamorphic rock, likely schist

Muscovite/biotite mica schist with quartz and feldspar

Vein-bearing metamorphic rock, likely gneiss or schist

Banded silicate rock; likely quartz–feldspar–mica gneiss with a quartz vein