Metamorphic Rock

Nephrite Jade

Nephrite

Schist

Schist

Quartzite

Quartzite

Quartzite Pebble

Quartzite (SiO2)

Pale-green schist fragment

Chlorite–sericite schist, possibly containing epidote or actinolite

Quartzite with Quartz Veins

Metamorphic Quartz-rich Rock (SiO2)

Banded gneiss (probable)

Gneiss, commonly quartz–feldspar–mica bearing

Quartzite

Quartzite

Biotite schist with quartz veins

Quartz–mica schist; primarily quartz (SiO₂), biotite mica, and feldspar

Quartz vein in foliated metamorphic rock

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

Unakite

Altered Granite (Epidotized Granite)

Green serpentine or nephrite-like stone

Serpentine-group minerals, chiefly antigorite/lizardite; possibly minor chlorite or actinolite

Likely raw garnet-bearing metamorphic rock

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

Quartz-rich stone tool or shaped mineral specimen

Likely milky quartz or quartzite (SiO₂); exact material cannot be confirmed from the image

Milky quartz-rich rock

Quartz, crystalline silica (SiO₂), likely massive milky quartz with minor feldspar or mica

Quartz-Veined Slate or Greenstone

Metamorphic rock with quartz vein (SiO2)

Eclogite

Eclogite

Quartzite

Quartzite

Garnet-bearing metamorphic rock

Garnet schist or garnet amphibolite; garnet likely almandine–pyrope solid solution, (Fe,Mg)₃Al₂Si₃O₁₂

Mica Schist

Mica Schist

Schist

Schist (Foliated Metamorphic Rock)

Likely green-gray serpentine-bearing rock

Serpentinite, dominated by serpentine-group minerals (antigorite/lizardite; Mg₃Si₂O₅(OH)₄), possibly with chlorite or talc

Greenstone (likely metamorphosed basalt)

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

Graphite-rich schist (probable graphite flake)

Graphite (C) in graphitic schist; commonly with quartz, mica, and feldspar

Banded Slate

Metamorphic Argillite / Slate

Gneiss (with Quartz Vein / Pegmatite Banding)

Metamorphic Gneiss

Weathered schist

Mica schist, typically quartz–mica schist

Weathered garnet-bearing gneiss

Quartz–feldspar–mica gneiss with almandine garnet, chiefly Fe₃Al₂(SiO₄)₃

Quartz Vein in Amphibolite / Gneiss

Quartz (SiO2) in Mafic Metamorphic Host Rock

Green aventurine (likely)

Quartz, SiO₂, containing fuchsite mica or other green inclusions

Likely weathered chert or siliceous shale

Cryptocrystalline quartz (SiO₂), possibly with clay minerals

Weathered mica-rich schist

Muscovite–biotite schist, possibly quartz-bearing

Gneiss

Biotite–quartz–feldspar gneiss

Schist

Schist

Fossilized shell fragment, likely bivalve

Bivalvia indet.; commonly preserved as calcite (CaCO₃) shell material

Muscovite mica (mica schist fragment)

Muscovite, KAl₂(AlSi₃O₁₀)(OH)₂; possibly intergrown with quartz and feldspar

Banded gneiss

Gneiss, commonly quartz–feldspar–mica gneiss

Banded gneiss (likely biotite-bearing)

Gneiss; quartz–feldspar–mica assemblage, with possible iron-oxide staining

Garnet-bearing gneiss

Quartz–feldspar–mica gneiss with iron-rich garnet (commonly almandine)

Iridescent schist or phyllite

Micaceous quartz-rich schist/phyllite, likely containing muscovite or chlorite

Honey calcite (likely rough cleavage fragment)

Calcite, calcium carbonate (CaCO₃)

Likely galena-bearing metamorphic sulfide ore

Galena (PbS), possibly with pyrite and/or sphalerite in a schistose host