Metamorphic (Likely Gneiss Or Schist Based On Texture)

Likely gneiss pebble

Gneiss, a foliated metamorphic rock composed mainly of quartz, feldspar, and mica

Biotite schist (mica-rich metamorphic rock)

Schist, chiefly quartz–feldspar–biotite; approximate formulae: biotite K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂

Quartz-rich metamorphic rock, likely quartzite or quartz-veined schist

Quartz (SiO₂) with mica/chlorite-rich schistose matrix; possibly minor feldspar and sulfides

Foliated mica-rich metamorphic rock, likely schist

Muscovite–biotite schist, possibly garnet-bearing

Pyrite-bearing sulfide specimen

Pyrite (FeS₂), possibly with chalcopyrite and weathered sulfides

Schist

Schist (various mineral compositions)

Weathered gneissic or granitic rock

Quartz–feldspar–biotite gneiss (tentative; possibly weathered granite)

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

Garnet

Almandine (Fe3Al2(SiO4)3)

Kyanite

Al2SiO5

Yellow Beryl

Beryl (Be3Al2(SiO3)6)

Mica schist (likely biotite–muscovite schist)

Mica schist; chiefly quartz (SiO₂) plus muscovite and biotite mica, with possible garnet or graphite

Banded Gneiss

Gneiss (Metamorphic Rock)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Staurolite (Fairy Cross)

Staurolite (Fe2+2Al9Si4O23(OH))

Staurolite (Fairy Stone)

Staurolite (Fe2+2Al9Si4O23(OH))

Mica schist with garnet

Garnet–mica schist, chiefly muscovite/biotite mica, quartz, feldspar, and almandine garnet

Schist

Mica Schist

Blue Kyanite

Kyanite (Al2SiO5)

Almandine Garnet

Almandine, Fe3Al2(SiO4)3

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

Epidote

Epidote (Ca2(Al2,Fe3+)AlSi3O12(OH))

Raw greenish mica-rich mineral specimen

Likely muscovite mica with quartz or feldspar inclusions; exact identification requires testing

Gneiss (with Quartz Vein / Pegmatite Banding)

Metamorphic Gneiss

Banded gneiss pebble

Gneiss, likely quartz–feldspar–mica gneiss

Stream-worn greenstone (likely serpentinite or altered basalt)

Serpentinite, chiefly serpentine-group minerals; possibly chlorite–actinolite greenstone

Garnet

Garnet group (X3Y2(SiO4)3)

Green Kyanite

Kyanite (Al2SiO5)

Pyrite-bearing schist

Likely pyrite (FeS₂) in a mica-rich schist; exact identification requires testing

Schorl (Black Tourmaline)

Sodium Iron Aluminum Borosilicate (NaFe3Al6(BO3)3Si6O18(OH)4)

Garnet (Almandine/Pyrope variety)

Silicate mineral group; typically Fe3Al2(SiO4)3 (Almandine) or Mg3Al2(SiO4)3 (Pyrope)

Mica-rich schist (likely muscovite schist)

Muscovite–quartz schist; chiefly muscovite mica, quartz, and minor feldspar/biotite

Amethyst, Aventurine, and Quartz Mix

Silicon Dioxide (SiO2) with various inclusions/trace elements

Greenschist / Chloritaform Schist

Chlorite Schist (Group of Silicate Minerals)

Likely mica schist fragment

Mica-rich schist, chiefly muscovite/biotite with quartz and feldspar

Muscovite Schist

Mica Schist (primarily KAl2(AlSi3O10)(OH)2)

Banded dark pebble (likely gneiss or banded metamorphic rock)

Indeterminate from the image; possibly banded gneiss

Blue glassy mineral fragment, likely kyanite or blue corundum

Tentatively kyanite (Al₂SiO₅); visual identification is uncertain from the photograph

Biotite-rich schist (probable mica schist)

Mica schist; chiefly quartz (SiO₂), biotite [K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂], and feldspar

Aventurine

Aventurine (Silicon Dioxide with Fuchsite inclusions) - SiO2

Schorl (Black Tourmaline)

Sodium Iron Aluminum Borosilicate Hydroxide; NaFe2+3Al6Si6O18(BO3)3(OH)3OH

Blue Dumortierite Quartz

Dumortierite in Quartz (AlAl6BSi3O12(O,OH)3)