Metamorphic Rock

Quartz-bearing metamorphic rock, likely quartzite with dark mica/amphibole

Quartzite or quartz-rich schist; chiefly SiO₂ quartz with biotite, hornblende/amphibole, and iron-oxide staining

Quartz-rich metamorphic rock, likely quartzite

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

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly microcrystalline quartz (SiO₂), with possible mica and feldspar

Pyrite-bearing metamorphic rock, likely pyrite schist or pyrite-rich slate

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

Quartz-rich metamorphic rock, likely garnet-mica schist or gneiss

Quartz–feldspar–mica metamorphic rock; probable biotite schist/gneiss

Weathered quartz-rich metamorphic rock, likely quartzite

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

Quartz-bearing metamorphic rock, likely quartzite

Quartzite, predominantly SiO₂, with possible feldspar and mica impurities

Quartz-rich metamorphic rock, likely quartzite

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

Weathered quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly microcrystalline SiO₂, possibly with minor feldspar, mica, and iron-oxide staining

Quartz-rich metamorphic rock, likely quartzite or quartz vein in schist

Quartz (SiO₂) with probable mica, feldspar, and iron-oxide staining

Mica-rich metamorphic rock, likely schist

Muscovite/biotite schist, possibly quartz-bearing

Banded metamorphic rock, likely gneiss or banded amphibolite

Undetermined foliated metamorphic rock; commonly quartz–feldspar–biotite gneiss or amphibolite

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly crystalline SiO₂, possibly with mica or feldspar

Quartz-bearing metamorphic rock, likely quartzite or hornfels

Quartz (SiO₂) in a fine-grained silicate matrix; exact rock identification requires testing

Rounded gray metamorphic rock, likely quartzite or gneiss

Quartz-rich metamorphic rock; exact identification is uncertain from the photograph

Pyrite-bearing metamorphic rock (likely schist or quartzite)

Quartz–mica rock with disseminated pyrite; pyrite is FeS₂

Schist

Schist (Crystalline metamorphic rock)

Quartz-bearing metamorphic rock (likely quartz vein in schist or altered granite)

Quartz (SiO₂) in a mica-rich host rock; exact identification requires testing

Banded metamorphic rock, likely mica schist or gneiss

Mica schist/gneiss, chiefly quartz, feldspar, biotite and muscovite

Pyrite-bearing metamorphic rock (likely schist or quartzite)

Mica/quartz-rich metamorphic matrix with pyrite (FeS₂), possibly chalcopyrite (CuFeS₂)

Weathered iron-rich metamorphic rock, possibly schist or metabasalt

Provisional identification: chlorite–quartz–feldspar schist or altered basalt; exact mineralogy requires testing

Quartz-rich metamorphic rock, likely quartzite

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

Weathered quartz-rich metamorphic rock, possibly quartzite

Quartzite (mostly SiO₂), with probable iron-oxide staining and minor feldspar/mica

Quartz-rich metamorphic rock, likely mica schist

Mica schist; chiefly quartz (SiO₂) and mica, likely muscovite/biotite, with possible feldspar

Weathered dark metamorphic rock, likely slate or phyllite

Fine-grained foliated rock, probably slate/phyllite; exact identification requires testing

Rounded gray-green metamorphic rock, likely serpentinite

Serpentinite; primarily serpentine-group minerals (lizardite/chrysotile/antigorite), commonly with magnetite and minor carbonate

Red garnet-bearing metamorphic rock

Almandine garnet (Fe₃Al₂Si₃O₁₂), likely in mica schist or quartz-rich matrix

Likely serpentine-rich metamorphic rock

Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, or chrysotile), with possible magnetite and minor chlorite/talc

Weathered quartz-rich metamorphic rock (probable quartzite)

Quartzite, predominantly crystalline SiO₂, possibly derived from sandstone

Veined quartz-bearing metamorphic rock

Likely quartzite or quartz-veined hornfels; exact identification requires a fresh surface and tests

Iron-stained metamorphic rock, likely schist or quartzite

Quartz–mica–iron oxide rock; probable muscovite/biotite schist or ferruginous quartzite

Quartz-rich metamorphic rock, likely quartzite

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

Quartz-rich metamorphic rock (likely quartzite)

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

Weathered quartz-rich metamorphic rock, likely quartzite

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

Dark metamorphic rock, likely schist or slate fragment

Indeterminate foliated metamorphic rock; possibly mica schist or slate

Weathered quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly crystalline SiO₂, possibly with mica or feldspar

Weathered iron-rich metamorphic rock, likely banded ironstone or quartzite

Ferruginous quartzite/itabirite; mainly quartz (SiO₂) with iron oxides such as hematite and goethite

Green-and-black mottled metamorphic rock (likely serpentinite)

Serpentinite, composed mainly of serpentine-group minerals (e.g., antigorite or lizardite); identification from the photo is provisional.

Foliated metamorphic rock, likely mica schist

Muscovite–biotite schist with quartz and feldspar

Iron-stained metamorphic rock, likely quartzite or jasper

Quartz-rich rock dominated by SiO₂, with iron oxides/hydroxides (hematite, goethite) and possible clay or mica

Raw mica-bearing metamorphic rock, likely schist

Mica schist; chiefly muscovite/biotite mica with quartz and feldspar

Likely garnet-bearing metamorphic rock

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