Metamorphic Mineral

Quartz with Mica / Chlorite Inclusion

Silicon Dioxide (SiO2) with Phyllosilicate minerals

Banded amphibolite (hornblende schist)

Amphibolite, chiefly hornblende + plagioclase feldspar, commonly with biotite and quartz

Greenstone

Metabasalt / Chlorite Schist

Mica-rich metamorphic rock, likely schist

Muscovite–biotite schist, possibly with quartz and feldspar

Epidote

Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

Weathered foliated metamorphic rock, likely schist or phyllite

Micaceous quartz–feldspar schist/phyllite; exact identification requires microscopy or testing

Likely weathered mica schist fragment

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

Epidote (Greenstone)

Calcium aluminum iron silicate hydroxide Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH)

Likely slate fragment

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

Banded gneiss (likely orthogneiss or paragneiss)

Gneiss; composition commonly quartz + feldspar + mica, with possible amphibole/biotite

Epidote

Epidote - Ca2(Al,Fe)3(SiO4)3(OH)

Schist with Biotite and Quartz

Biotite-Quartz Schist (Fe,Mg,Al silicate mix)

Gneiss with Quartz Vein

Metamorphic Gneiss with Quartz (SiO2) and Feldspar Injection

Greenschist / Serpentinite

Metamorphic rock rich in chlorite/actinolite/serpentine

Banded gneiss or gneissic schist

Quartz–feldspar–mica gneiss; exact mineral proportions require testing

Epidote

Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Banded gneiss

Gneiss, commonly quartz–feldspar–mica gneiss

Serpentine-bearing metamorphic rock (likely chromite/vesuvianite-bearing serpentinite)

Serpentinite, chiefly serpentine-group minerals [(Mg,Fe)₃Si₂O₅(OH)₄], with dark accessory minerals

Epidote

Epidote, Ca₂(Al,Fe³⁺)₃(SiO₄)₃(OH); commonly occurring as an epidote-rich rock

Wollastonite

Calcium Inosilicate, CaSiO3

Banded gneissic rock

Gneiss, likely quartz–feldspar–biotite gneiss

Greenschist / Serpentinite Cobble

Greenschist (composed primarily of chlorite, actinolite, and epidote)

Quartz-bearing metamorphic rock, likely quartzite

Quartzite, predominantly SiO₂, with possible feldspar and mica impurities

Banded gneiss pebble

Biotite–quartz–feldspar gneiss (composition variable)

Greenstone / altered mafic rock

Likely chlorite–epidote–actinolite schist or altered basalt (greenstone); exact identification requires thin-section or chemical testing.

Garnet Amphibolite (or Garnet Gneiss)

Garnet amphibolite / Garnet-bearing metamorphic rock

Fuchsite (Chrome Mica)

K(Al,Cr)2(AlSi3O10)(OH)2

Banded gneiss, probably granitic gneiss

Foliated gneiss composed mainly of quartz (SiO₂), feldspar—orthoclase/microcline and plagioclase—and dark mica, commonly biotite K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂

Fuchsite (Chrome Mica)

K(Al,Cr)2(AlSi3O10)(OH)2

Hematite

Iron(III) oxide (Fe2O3)

Green Aventurine in Host Rock

SiO2 (Quartz with Fuchsite inclusions)

Staurolite

Staurolite (Fe2Al9O6(SiO4)4(O,OH)2)

Black Spinel

Magnesium Aluminum Oxide (MgAl2O4)

Kyanite

Kyanite (Al2SiO5)

Pearl and Garnet Glass

Calcium Carbonate (CaCO3) for pearl; Silicon Dioxide (SiO2) for glass

Fluorite (left), Sodalite (middle), Dumortierite/Tumbled Quartzite (right)

Calcium Fluoride (CaF2), Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2), Aluminum Borosilicate (Al7(BO3)(SiO4)3O3)

Pyrite

Iron Sulfide (FeS2)

Quartz (Engineered Stone Countertop)

Silicon Dioxide (SiO2) within a resin matrix

Black Spinel

Magnesium Aluminum Oxide (MgAl2O4)

Man-made Green Quartz (Lab-grown or Treated)

Silicon Dioxide (SiO2) with artificial coloration

Schist

Schist (various mineralogical compositions including mica, chlorite, talc, etc.)

Jade (likely Nephrite Jade based on appearance)

Nephrite (a variety of actinolite, Ca2(Mg,Fe)5Si8O22(OH)2)