Metamorphic (Likely Gneiss Or Schist Based On Texture)

Mica Schist

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

Schist

Mica Schist

Gneiss with Quartz Veining

Gneiss (High-grade regional metamorphic rock)

Folded Schist / Gneiss (Metamorphic Rock)

Regional Metaphoric Folded Outcrop (predominantly Schist/Gneiss)

Mica Schist (Greenschist / Chlorite Schist)

Schist (rich in Muscovite, Chlorite, and Quartz)

Rough Dark Green Sapphire

Corundum (Al2O3)

Blue Sapphire

Corundum (Al2O3 - Aluminum Oxide)

Banded Gneiss (with possible weathered sulfide or iron staining)

Gneiss, potentially with iron oxide/hydroxide staining (e.g., limonite) or weathered sulfides

Schist

Mica Schist (Medium-grade metamorphic rock)

Biotite-rich granite or granitic gneiss

Quartz–feldspar–biotite granite; possibly foliated granitic gneiss

Greenschist

Chlorite schist

Sapphire (Corundum)

Corundum (Al2O3)

Gneiss

Gneiss (High-grade metamorphic rock)

Almandine Garnet

Almandine (Fe3Al2Si3O12)

Mica Schist

Mica Schist (principally Biotite/Muscovite, Quartz, and Feldspar)

Schist (containing Muscovite Mica and Chlorite)

Mica Schist

Graphite

Graphite (Carbon, C)

Garnet (likely Almandine or Pyrope)

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

Beryl (likely Emerald or Aquamarine in matrix)

Beryllium aluminum silicate (Be3Al2Si6O18)

Muscovite Schist with Quartz

Muscovite (KAl2(AlSi3O10)(OH)2) in Quartz Matrix

Mica Schist

Mica Schist (primarily muscovite and biotite)

Gneiss

Gneiss (High-grade metamorphic rock)

Granitic Gneiss

Gneiss (Granite-derived)

Schist

Mica Schist

Garnet (likely Almandine or a blend)

Garnet group: X3Y2(SiO4)3, where X can be Ca, Mg, Fe2+, Mn2+ and Y can be Al, Fe3+, Cr3+. Given the dark, somewhat reddish-brown appearance in the image, it's likely Almandine (Fe3Al2(SiO4)3) or a mix with other iron-rich garnets.

Schist

Mica Schist (Medium-grade metamorphic rock)

Weathered granitoid (likely granite or granitic gneiss)

Granite; chiefly quartz, feldspar, and mica (exact identification uncertain from the photo)

Gneiss

Foliated Metamorphic Rock

Quartz Vein in Amphibolite / Gneiss

Quartz (SiO2) in Mafic Metamorphic Host Rock

Quartzite (likely iron-stained)

Quartzite; predominantly crystalline silicon dioxide (SiO₂)

Muscovite Mica Schist

Metamorphic rock rich in muscovite mica (KAl2(AlSi3O10)(F,OH)2)

Fuchsite

Chromium-rich Muscovite (KAl2(AlSi3O10)(OH,F)2 with Cr replacements)

Copper-bearing Mica Schist

Mica Schist with Native Copper inclusions

Gneissic River Pebble

Gneiss

Ruby (Cabochon)

Corundum (Al2O3)

Green Mica Schist

Mica Schist (Fuchsite or Chlorite variety)

Garnet (likely Pyrope or Almandine)

Garnet Group (complex nesosilicate minerals, e.g., Pyrope Mg3Al2(SiO4)3, Almandine Fe3Al2(SiO4)3, Spessartine Mn3Al2(SiO4)3, Grossular Ca3Al2(SiO4)3, Andradite Ca3Fe2(SiO4)3, Uvarovite Ca3Cr2(SiO4)3). The vivid red color in the image strongly suggests Pyrope or Almandine.

Mica Schist with Biotite or Muscovite

Metamorphic rock rich in sheet silicates

Gneiss (with Quartz and Biotite Mica)

Gneiss

Gneiss (Gneissic Granite Pebble)

Metamorphic rock rich in Quartz, Feldspar, and Mica

Mica Schist

Mica Schist (contains muscovite/biotite, quartz, plagioclase)

Garnet in Matrix

Almandine/Grossular Garnet in Pegmatite or Schist