Metamorphic Rock

Nephrite Jade

Nephrite

Schist

Schist

Quartzite

Quartzite

Quartzite Pebble

Quartzite (SiO2)

Foliated metamorphic rock, likely schist or gneiss

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

Pale-green schist fragment

Chlorite–sericite schist, possibly containing epidote or actinolite

Rounded quartz-rich pebble

Likely vein quartz or quartzite; exact identification is uncertain from the image

Likely banded gneiss

Foliated quartz–feldspar gneiss, with dark biotite or amphibole

Quartzite with Quartz Veins

Metamorphic Quartz-rich Rock (SiO2)

Flagstone (likely sandstone or slate)

Flagstone is a paving form, not a single rock species; likely thin-bedded sandstone, with possible slate pieces

Banded gneiss (probable)

Gneiss, commonly quartz–feldspar–mica bearing

Quartzite

Quartzite

Iron-stained quartz or quartzite fragment

Likely quartz (SiO₂), possibly iron-oxide-stained quartzite; exact identification is uncertain from the image

Unakite

Altered Granite (Epidotized Granite)

Quartz vein in foliated metamorphic rock

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

Biotite schist with quartz veins

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

Likely raw garnet-bearing metamorphic rock

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

Green serpentine or nephrite-like stone

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

Quartz-rich stone tool or shaped mineral specimen

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

Quartz-Veined Slate or Greenstone

Metamorphic rock with quartz vein (SiO2)

Quartzite

Quartzite

Milky quartz-rich rock

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

Garnet-bearing metamorphic rock

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

Eclogite

Eclogite

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

Mica Schist

Mica Schist

Banded Slate

Metamorphic Argillite / Slate

Gneiss (with Quartz Vein / Pegmatite Banding)

Metamorphic Gneiss

Schist

Schist (Foliated Metamorphic Rock)

Quartz vein fragment

Milky quartz (SiO₂), with a tan, iron-stained host rock

Graphite-rich schist (probable graphite flake)

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

Weathered schist

Mica schist, typically quartz–mica schist

Weathered garnet-bearing gneiss

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

Likely quartz-rich pebbles

Quartz (SiO₂), possibly milky quartz or quartzite; identification is uncertain from the blurry image

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

Amphibolite

Amphibolite, composed chiefly of hornblende-group amphibole and plagioclase feldspar

Quartz Vein in Amphibolite / Gneiss

Quartz (SiO2) in Mafic Metamorphic Host Rock

Gneiss

Biotite–quartz–feldspar gneiss

Fossilized shell fragment, likely bivalve

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

Epidote

Calcium aluminum iron silicate hydroxide, Ca2(Al, Fe)3(SiO4)3(OH)