Mineral In Metamorphic Rock

Serpentine

Antigorite, Lizardite, or Chrysotile (Mg3Si2O5(OH)4)

Likely graphite-rich metamorphic rock (graphitic schist)

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

Weathered quartz-rich metamorphic rock, possibly quartzite

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

Quartz-rich metamorphic rock, likely quartzite

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

Epidosite (Unakite-related)

Epidosite (composed primarily of Epidote and Quartz)

Likely slate fragment

Slate; fine-grained foliated metamorphic rock, commonly quartz–mica–chlorite rich

Dark, mica-rich metamorphic rock (possibly schist)

Mica schist, tentatively; exact identification is limited by the small, partly obscured specimen

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly crystalline SiO₂, with minor feldspar or mica

Quartz-rich metamorphic rock, likely quartzite

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

Iron-stained metamorphic rock, likely schist or quartzite

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

Weathered 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 crystalline SiO₂, possibly with mica or feldspar

Quartz–mica metamorphic rock, likely schist

Quartz–muscovite/biotite schist; predominantly SiO₂ quartz with phyllosilicate micas

Quartz-rich metamorphic rock, likely quartzite

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

Banded Gneiss

Metamorphic Gneiss

Milky Quartz with Country Rock contact

Silicon Dioxide (SiO2) in contact with Metamorphic/Igneous rock

Lapis Lazuli

Lapis Lazuli (Primary mineral: Lazurite, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite mica

Schist

Schist (Crystalline Metamorphic Rock)

Black Tourmaline (Tumbled)

Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)4)

Clear Quartz (Faceted)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Banded Gneiss

Gneiss (SiO2 enriched metamorphic rock)

Mica Schist

Schist (Crystalline metamorphic rock)

Quartz (Smoky/Granular variety)

Silicon Dioxide (SiO2)

Banded Gneiss / Metamorphic River Pebble

Gneiss (Foliated Metamorphic Rock)

Gneiss (High-grade Metamorphic Rock)

Gneiss (Metamorphic silicate rock)

Weathered quartz-rich metamorphic rock, likely quartzite

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

Quartz-rich metamorphic rock, likely quartzite

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

Garnet Amphibolite (or Garnet Gneiss)

Garnet amphibolite / Garnet-bearing metamorphic rock

Banded metamorphic rock, likely gneiss or schist

Foliated quartz–feldspar–mica rock; exact identification requires a closer view or mineral testing

Uncertain dark metamorphic rock, likely schist or slate

Foliated silicate rock; possibly chlorite–mica schist or slate

Weathered quartz-rich metamorphic rock, likely quartzite

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

Schist

Crystalline Metamorphic Rock (Schistose)

Quartz-veined metamorphic rock, likely greenschist or altered basalt

Chlorite–actinolite schist or metabasalt with a milky quartz vein

Calcite

Calcite (Calcium Carbonate, CaCO3)

Garnet

Pyrope or Almandine (X3Y2(SiO4)3)

Serpentine Sphere

Serpentinite

Schist (Oxidized)

Mica Schist with Iron Oxide staining

Weathered amphibolite or mafic metamorphic rock

Amphibolite; chiefly hornblende amphibole and plagioclase feldspar

Gneiss with Quartz Veining

Gneiss (High-grade Metamorphic Rock)

Amphibolite (specifically Hornblende Schist/Gneiss)

Amphibole-rich Metamorphic Rock