Metamorphic (Likely Gneiss Or Schist Based On Texture)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Tumbled or naturally etched mica-rich mineral specimen, likely muscovite

Muscovite, KAl₂(AlSi₃O₁₀)(OH)₂; possibly phlogopite mica

Gneiss

Gneiss (High-grade metamorphic rock)

Biotite / Black Mica

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

Muscovite Mica

Muscovite - KAl2(AlSi3O10)(F,OH)2

Brown Garnet

Andradite or Almandine Garnet (general formula X3Y2(SiO4)3)

Garnet

Garnet Group (e.g., Almandine Fe3Al2(SiO4)3 or Pyrope Mg3Al2(SiO4)3)

Muscovite Mica

KAl2(AlSi3O10)(F,OH)2

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(F,OH)2)

Pyrite-bearing schist (likely mica schist)

Muscovite–quartz schist with disseminated pyrite (FeS₂)

Garnet

Garnet Group (e.g., Almandine, Pyrope)

Mica (Lepidolite or Muscovite)

Phyllosilicate mineral (KAl2(AlSi3O10)(OH)2 for Muscovite)

Schist

Schist (primarily mica-schist)

Fuchsite

Chromium-rich Muscovite (KAl2(AlSi3O10)(OH)2)

Schist (likely Mica Schist)

Mica Schist

Muscovite Mica

Muscovite (Potassium Aluminum Silicate Hydroxide), KAl2(AlSi3O10)(OH)2

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Muscovite

KAl2(AlSi3O10)(OH)2

Schist

Mica Schist

Milky Quartz (with Iron Oxide staining)

Quartz (Silicon Dioxide - SiO2)

Foliated Metamorphic Rock (likely Gneiss or Schist)

Gneissic Metamorphic Rock

Biotite Schist

Biotite-rich Schist

Schist

Mica Schist (contains muscovite/biotite and quartz)

Muscovite Mica

KAl2(AlSi3O10)(OH)2

Biotite (Mica)

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

Weathered metamorphic rock, likely gneiss or schist

Indeterminate foliated silicate rock; commonly quartz–feldspar–mica assemblage

Biotite (Mica)

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

Muscovite Mica

Muscovite, KAl2(AlSi3O10)(OH)2

Painted River Rock (likely Quartzite or Granite)

Quartzite or Granitic Gneiss (painted)

Biotite in Host Matrix

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

Muscovite

Muscovite (KAl2(AlSi3O10)(OH)2)

River Stone (likely Quartzite or Limestone)

Silicon dioxide (SiO2) or Calcium carbonate (CaCO3)

Biotite (Mica)

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

Garnet (likely Almandine)

Almandine - Fe3Al2(SiO4)3

Gneiss (Pebble)

Gneiss

Fuchsite

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

Banded gneiss

Gneiss, typically quartz–feldspar–mica assemblage

Schist

Mica Schist

Banded River Rock / Gneiss (highly weathered)

Gneiss

Muscovite Mica

Muscovite [KAl2(AlSi3O10)(OH)2]

Pyrite-bearing Schist

Pyritic Quartz-Mica Schist with FeS2 inclusion

Green Kyanite

Kyanite (Al2SiO5)