Mineral In Metamorphic Rock

Gneiss (with Quartzite and Biotite)

Gneiss containing SiO2 (Quartz), K(Mg,Fe)3AlSi3O10(OH)2 (Biotite), and (K,Na,Ca)AlSi3O8 (Feldspar)

Serpentine

Antigorite, Lizardite, or Chrysotile (Mg, Fe)3Si2O5(OH)4

Blue Tiger's Eye

Crocidolite in Quartz (altered)

Blue Calcite

Calcium Carbonate (CaCO3)

Gneiss

Gneiss

Amphibolite with Hornblende

Amphibole-rich Metamorphic Rock (Ca2(Mg,Fe)5Si8O22(OH)2)

Banded Metamorphic Rock (likely Quartzite or Serpentinite/Soapstone)

Metamorphic Rock (possibly a banded Quartzite or a foliated Serpentinite/Talc Schist based on appearance, general term for such a rock is 'Banded Metamorphic Rock' or 'Gneiss' if pronounced banding of different minerals)

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Quartz

Silicon dioxide (SiO2)

Epidote

Epidote Group (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Slate

Foliated Metamorphic Rock (composed primarily of Quartz, Muscovite, and Illite)

Greenstone (Epidote/Chlorite Rich Rock)

Metabasalt (often contains Epidote Ca2Al2(Fe3+;Al)(SiO4)(Si2O7)O(OH))

Clear Quartz

Silicon dioxide (SiO2)

Unidentifiable Rock Fragment

Milky Quartz

Silicon Dioxide (SiO2)

Lapis Lazuli (polished cabochon/sphere)

Na8[Al6Si6O24]Sn with accessory minerals (Pyrite, Calcite)

Amphibolite (specifically Hornblende Schist/Gneiss)

Amphibole-rich Metamorphic Rock

Gneiss (River Cobble)

Gneiss (Foliated Metamorphic Rock)

Lapis Lazuli

Lapis Lazuli (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2

Mica (Biotite or Phlogopite variety)

Phyllosilicate (complex mineral formula involving K, Mg, Fe, Al, Si, and O)

Calcite

Calcite (Calcium Carbonate, CaCO3)

Biotite Mica in Host Rock

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

Schist

Mica Schist (primarily consisting of muscovite KAl2(AlSi3O10)(OH)2 or biotite K(Mg,Fe)3(AlSi3O10)(OH)2)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Orthoclase Feldspar

Potassium aluminum silicate (KAlSi3O8)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Lapis Lazuli

Lazurite-dominant Metamorphic Rock (complex aluminosilicate)

Milky Quartz

Silicon Dioxide (SiO2)

Garnet in Matrix (likely Almandine in Quartz/Mica Schist)

Almandine Garnet (Fe3Al2(SiO4)3) in Quartz-Feldspar host rock

Banded Gneiss

Gneiss (High-grade metamorphic rock)

Greenschist

Greenschist facies rock

Milky Quartz

Quartz / Silicon Dioxide (SiO2)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals, Mg3Si2O5(OH)4)

Schist

Crystalline Metamorphic Rock (Schistose)

Lapis Lazuli (Tumbled Stone)

Na6Ca2(Al6Si6O24)(SO4,S,Cl)2 (Lazulite-rich Metamorphic Rock)

Marble

Recrystallized Calcite (CaCO3)

Gneiss (specifically a weathered or stream-worn specimen)

Gneiss (Foliated Metamorphic Rock)

Rough Sapphire (Corundum)

Corundum (Al2O3)

Banded Agate

Agate (Cryptocrystalline variety of Quartz, SiO2)

Blue Sapphire

Corundum (Al2O3)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Garnet Schist

Almandine Garnet-Mica Schist (X₃Y₂(SiO₄)₃)