Mineral In A Metamorphic

Garnet (likely Almandine or Pyrope)

Garnet (Group Name), Fe3Al2(SiO4)3 or Mg3Al2(SiO4)3

Garnet

Almandine Garnet (Fe3Al2(SiO4)3)

Almandine Garnet

Almandine, Fe3Al2(SiO4)3

Garnet (Almandine variety)

Almandine Garnet (Fe3Al2(SiO4)3)

Gneiss with Quartz Vein

Metamorphic Gneiss

Gneissic Schist

Gneiss-schist (Metamorphic rock)

Banded gneiss (water-worn pebble)

Quartz–feldspar gneiss, with likely mica; exact mineralogy cannot be confirmed from the photo

Granite

Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica

Dark metamorphic rock, likely schist or gneiss

Mica schist/gneiss; commonly quartz + feldspar + biotite, with possible amphibole

Garnet Schist

Almandine-Mica Schist

Rounded granitic gneiss pebble

Granitic gneiss; chiefly quartz, feldspar, and mica

Biotite-rich gneiss

Gneiss, likely quartz–feldspar–biotite gneiss

Likely biotite-rich schist or gneiss

Mica schist/gneiss; chiefly quartz, feldspar, and biotite mica

Slate

Slate; fine-grained metamorphosed shale, commonly quartz–illite/chlorite rich

White marble (likely calcitic marble)

Calcite-rich marble; primarily calcium carbonate, CaCO₃

Sapphirine in Matrix

Sapphirine (Mg,Al)8(Al,Si)6O20

Kyanite

Aluminum Silicate, Al2SiO5

Likely garnet-bearing metamorphic rock

Garnet amphibolite or garnet-bearing schist; probable almandine garnet (Fe₃Al₂Si₃O₁₂) with amphibole, mica, quartz, and feldspar

Biotite-rich schist (mica schist)

Mica schist, chiefly quartz + biotite mica; approximate formula for biotite K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂

Small metallic-looking rock fragment

Uncertain; possibly galena-bearing ore or mica-rich schist

Quartz-veined metamorphic rock, likely schist or gneiss

Quartz–feldspar–mica rock; exact identification requires testing

Likely mica-rich schist

Mica schist, composed mainly of quartz and mica (muscovite and/or biotite)

River Stone (Granitic Gneiss)

Foliated Granitic Gneiss

Mica Schist

Mica Schist (predominantly Muscovite/Biotite)

Biotite gneiss (probable)

Foliated gneiss composed mainly of quartz, feldspar, and biotite mica

Gneiss (or Granite Gneiss)

Metamorphic rock rich in quartz, feldspar, and biotite/amphibole

Granitic Gneiss Pebble

Gneiss (felsic metamorphic rock)

Quartz

Silicon dioxide (SiO2)

Limonite

FeO(OH)•nH2O

Limonite

FeO(OH)·nH2O

Limonite

FeO(OH)•nH2O

Limonite

FeO(OH)•nH2O

Limonite

FeO(OH)·nH2O

Limonite

FeO(OH)•nH2O

Limonite Concretion

Hydrated Iron Oxide-Hydroxide (FeO(OH)·n H₂O)

Quartz with Inclusions

Silicon Dioxide (SiO2)

Quartz (Iron-stained Quartz)

Silicon Dioxide (SiO2)

Quartz (Milky/Snow)

Silicon Dioxide (SiO2)

Limonite

FeO(OH)•nH2O

Limonite

FeO(OH)•nH2O

Limonite

FeO(OH)·nH2O

Rough amber-colored quartz or calcite fragment

Likely quartz (SiO₂) or calcite (CaCO₃); exact identification requires testing