Metamorphic (Likely Gneiss Or Schist Based On Texture)

Quartz with Mica inclusions (likely Schist or Gneiss host)

Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(OH)2)

Biotite Mica

K(Mg, Fe)3AlSi3O10(F, OH)2

Likely graphite-rich schist (graphitic schist)

Graphitic schist; chiefly quartz, mica, and graphite (carbon), with possible pyrite or feldspar

Gneiss (Metamorphic Cobble)

Gneiss

Banded Gneiss

Gneiss (High-grade Metamorphic Rock)

Gneiss

Gneiss

Biotite (Black Mica) in Host Rock

K(Mg,Fe)3AlSi3O10(OH,F)2

Quartz / Quartzite

Silicon Dioxide (SiO2)

Gneiss

Gneiss

Gneiss

Gneiss (Metamorphic rock of variable composition, typically SiO2 rich)

Muscovite Mica (on Quartz Matrix)

Muscovite - KAl2(AlSi3O10)(OH)2

Gneiss

Gneiss (High-grade Regional Metamorphism)

Banded Gneiss

Gneiss

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Gneiss

Metamorphic Gneiss (High-grade regional metamorphism)

Schist

Mica Schist (Variable chemistry, often rich in muscovite and biotite)

Weathered quartz-rich pebble

Likely quartz-bearing granite or granitic gneiss; exact identification requires testing

Banded gneiss pebble

Gneiss, typically quartz–feldspar–mica banded rock

Graphite

Graphite (Carbon, C)

Schist

Metamorphic Rock (Mica Schist)

Garnet (likely Almandine)

Almandine Garnet, Fe3Al2(SiO4)3

Gneiss

Gneiss

Gneiss

Gneiss

Biotite (Black Mica)

Biotite - K(Mg,Fe)3AlSi3O10(F,OH)2

Banded Gneiss

Gneiss (SiO2-rich metamorphic rock)

Biotite Mica

Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)

Lepidolite in Mica Schist

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2

Gneiss (Metamorphic Rock)

Gneiss

Schist

Mica Schist

Gneiss

Gneiss

Quartzite

Quartzite (primarily SiO2)

Gneiss

Metamorphic rock of high-grade regional metamorphism

Biotite Schist

Biotite Gneiss/Schist (approximate formula K(Mg,Fe)3AlSi3O10(OH)2)

Blue Sapphire

Corundum (Al2O3 with iron and titanium trace elements)

Muscovite (White Mica)

Muscovite - Potassium aluminum silicate: KAl2(AlSi3O10)(F,OH)2

Muscovite (Mica) in Quartz Matrix

Muscovite (KAl2(AlSi3O10)(OH)2) and Quartz (SiO2)

Gneiss

Gneiss (a metamorphic rock)

Gneiss

Gneiss (High-grade metamorphic rock)

Gneiss

Gneiss (High-Grade Metamorphic Rock)

Blue Kyanite in Schist

Al2SiO5 in Mica Schist

Gneiss

Gneiss