Mineral, Often Found In Metamorphic Rocks But Also In Sedimentary And Igneous Rocks

Orthoclase Feldspar

Orthoclase (KAlSi₃O₈)

Pyrite in Matrix (often with Chalcopyrite)

Iron Sulfide (FeS2) / Copper Iron Sulfide (CuFeS2)

Pyrite

Iron Disulfide (FeS2)

Optical Calcite (Iceland Spar)

Calcite (Calcium Carbonate, CaCO3)

Gneiss

Gneiss (High-grade metamorphic rock)

Garnet (likely Almandine, Pyrope, or a blend)

Garnet group minerals: X3Y2(SiO4)3, where X and Y represent various metal ions (e.g., Almandine: Fe3Al2(SiO4)3, Pyrope: Mg3Al2(SiO4)3)

Amphibolite (specifically Hornblende Schist/Gneiss)

Amphibole-rich Metamorphic Rock

Epidote

Epidote (Ca2(Al,Fe)3(SiO4)3(OH))

Garnet

Garnet Group (formula varies, e.g., Almasndine: Fe3Al2(SiO4)3)

Black Spinel

Magnesium Aluminum Oxide (MgAl2O4)

Green Schist

Greenschist (composed primarily of Chlorite, Actinolite, and Epidote)

Quartz (pebble)

Quartz (SiO₂)

Milky Quartz

Silicon Dioxide (SiO2)

Garnet Beads

Garnet Group (complex nesosilicates, e.g., Almandine Fe3Al2(SiO4)3)

Clear Quartz

Silicon Dioxide (SiO2)

Blue Chalcedony

Silicon Dioxide (SiO2)

Veined Quartz

SiO2 (Silicon Dioxide)

Epidote

{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)

Yellow Quartz (Citrine or Quartzite Pebble)

Silicon Dioxide (SiO2)

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Garnet (Almandine/Pyrope)

Silicate Mineral (Group: X3Y2(SiO4)3 where X=Mg, Fe, Mn and Y=Al, Fe, Cr)

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Pyrite

Iron Disulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Biotite Schist

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

Quartz

Quartz (SiO₂)

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

Orange Calcite

Calcium Carbonate (CaCO3)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Pyrite

Iron Disulfide (FeS2)

Corundum

Corundum (Al2O3)

Calcite

Calcite (CaCO₃, Calcium Carbonate)

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

Fluorite

Fluorite (CaF₂)

Gneiss

Gneiss

Blue Apatite

Apatite-(CaF), Ca5(PO4)3F (Calcium Fluorophosphate)

Milky Quartz (with trace inclusions)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Arsenopyrite in Quartz Matrix

Arsenopyrite (FeAsS) with Quartz (SiO2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)