Metamorphic (Likely Gneiss Or Schist Based On Texture)

Schist (Garnet-Mica Schist)

Garnetiferous Mica Schist (primarily Muscovite/Biotite and Almandine Garnet)

Garnet (specifically Almandine or Pyrope)

Almandine: Fe3Al2(SiO4)3 or Pyrope: Mg3Al2(SiO4)3

Gneiss

Foliated Metamorphic Rock (Gneiss)

Staurolite

Staurolite (Fe2+2Al9Si4O23(OH))

Kyanite in Quartz

Kyanite (Al2SiO5) with Quartz (SiO2)

Blue Sapphire

Corundum (Al2O3 with trace amounts of iron and titanium)

Staurolite (Cross Stone)

Staurolite (Fe2+2Al9Si4O23(OH))

Gneiss (specifically Granite Gneiss)

Gneiss (High-grade Regional Metamorphic Rock)

Quartz (likely) / Siliceous rock with quartz phenocrysts (if a rock fragment)

Quartz (SiO₂)

Ruby (in costume jewelry context)

Corundum (Al2O3) with Chromium impurities

Garnet (Almandine)

Almandine (Fe3Al2(SiO4)3)

Quartz on Chlorite Schist

Chlorite Schist (Mg,Fe)3(Si,Al)4O10(OH)2 with Quartz (SiO2)

Banded Gneiss (River Cobble)

Gneiss (a high-grade metamorphic rock)

Garnet (Almandine or Spessartine likely)

Garnet Group Minerals (e.g., Almandine Fe3Al2(SiO4)3, Pyrope Mg3Al2(SiO4)3, Spessartine Mn3Al2(SiO4)3)

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

Quartz (likely Clear Quartz or Rock Crystal)

Quartz (SiO2)

Graphite Schist

C (Carbonaceous Schist)

Greenschist

Greenschist (Chlorite Schist)

Tanzanite

Blue-violet Zoisite (Ca2Al3(SiO4)3(OH))

Garnet

Almandine (Fe3Al2(SiO4)3)

Sandstone (Stream-rounded)

Arenite (SiO2 based)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Biotite Mica

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

Black Tourmaline

Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)

Garnet (Almandine)

Almandine (Fe3Al2(SiO4)3)

Garnet (Almandine variety)

Almandine Garnet (Fe3Al2(SiO4)3)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Staurolite (Fairy Stone)

Staurolite (Fe2+2Al9Si4O23(OH))

Soapstone (Talc-Schist)

Steatite (composed primarily of Talc: Mg3Si4O10(OH)2)

Quartzite with Gneissic Banding

Quartzite (primarily SiO2) with mafic mineral inclusions

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

Muscovite Schist

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

Quartz (likely milky/gray variety)

Quartz (SiO₂)

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

Biotite Mica

K(Mg,Fe2+)3(Al,Fe3+)Si3O10(OH,F)2

Gneiss

Gneiss (High-grade metamorphic rock)

Emerald with Matrix (Emerald in Mica Schist)

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Mica Schist

Mica Schist

Rough Dark Green Sapphire

Corundum (Al2O3)

Garnet (likely Almandine or Pyrope)

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

Almandine Garnet

Almandine - Fe3Al2(SiO4)3

Granodiorite (Gneissic texture)

Granodiorite (containing Quartz SiO2, Plagioclase Feldspar, and Biotite)