Metamorphic Rock

Quartzite with inclusions

Metamorphic Rock (Mainly SiO2)

Amphibolite (specifically Hornblende Schist/Gneiss)

Amphibole-rich Metamorphic Rock

Lapis Lazuli

Lazurite-rich metamorphic rock

Greenschist

Greenschist facies metamorphic rock

Slate

Low-grade Metamorphic Rock

Gneiss

Gneiss (a type of metamorphic rock)

Lapis Lazuli (Fragment)

Lazurite-rich 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

Weathered quartz-rich metamorphic rock (likely quartzite)

Quartzite, predominantly crystalline SiO₂, with iron-oxide staining and possible feldspar/mica

Weathered quartz-rich metamorphic rock

Likely quartzite or quartz-rich gneiss; exact identification requires a fresh surface and testing

Rough garnet-bearing metamorphic rock

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

Weathered quartz-rich metamorphic rock, likely quartzite

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

Likely iron-rich metamorphic rock (possibly hematite-rich ironstone)

Uncertain from the image; possible hematite-bearing ironstone, chiefly Fe₂O₃ with associated silicate minerals

Mica-rich metamorphic rock, likely schist

Muscovite–biotite schist, possibly with quartz and feldspar

Foliated metamorphic rock, likely mica schist

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

Likely serpentine-rich metamorphic rock

Serpentinite; chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), possibly with magnetite and chlorite

Blue-gray foliated metamorphic rock, likely slate or phyllite

Slate (fine-grained metamorphosed shale), possibly phyllite; mineral proportions cannot be confirmed from the image

Garnet-bearing metamorphic rock, likely schist or gneiss

Biotite–garnet schist/gneiss; dark minerals likely biotite and graphite or amphibole, with quartz and feldspar

Weathered quartz-rich metamorphic rock, likely quartzite

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

Likely pyrite-bearing metamorphic rock

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

Likely graphite-rich metamorphic rock (graphitic schist)

Graphitic schist; chiefly carbon (graphite) with quartz, mica, and possibly sulfides

Quartz-rich metamorphic rock, likely quartzite

Quartzite, composed predominantly of quartz (SiO₂), possibly with minor feldspar, mica, or iron oxides

Weathered quartz-rich metamorphic rock, likely quartzite

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

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly crystalline SiO₂, possibly with mica or feldspar

Dark foliated metamorphic rock, likely schist

Mica schist, probably muscovite–biotite schist

Coarse-grained metamorphic rock, likely mica schist

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

Weathered mica-rich metamorphic rock, likely schist

Muscovite/biotite schist with quartz and feldspar

Weathered iron-rich metamorphic rock, likely schist or phyllite

Quartz–mica schist/phyllite; composition likely quartz, mica, feldspar, and iron oxides

Likely pyrite-bearing metamorphic rock

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

Mica-rich metamorphic rock, likely phyllite or mica schist

Quartz–muscovite phyllite/schist; commonly dominated by muscovite mica, quartz, and minor feldspar

Iron-rich metamorphic rock (likely banded iron formation fragment)

Banded iron formation; chiefly quartz (SiO₂) and iron oxides such as hematite (Fe₂O₃) and magnetite (Fe₃O₄)

Quartz-rich metamorphic rock, likely quartzite

Quartzite (mostly microcrystalline quartz, SiO₂)

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly crystalline SiO₂ with minor iron-oxide staining and possible feldspar/mica

Likely quartz-rich metamorphic rock (quartzite or micaceous schist)

Quartzite/schist; predominantly quartz (SiO₂) with mica and minor iron oxides

Mica-rich metamorphic rock, likely schist

Biotite–muscovite schist; composition may include quartz and feldspar

Mica-rich metamorphic rock, likely schist

Biotite–muscovite schist, possibly with quartz and sulfide minerals