Mineral In Metamorphic Rock

Gneiss

Gneiss (High-grade Metamorphic Rock)

Metallic sulfide ore, likely pyrite-bearing rock

Pyrite (FeS₂), possibly with chalcopyrite and quartz/host rock

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

Quartz Pebble

Silicon Dioxide (SiO2)

Likely galena-bearing metamorphic sulfide ore

Galena (PbS), possibly with pyrite and/or sphalerite in a schistose host

Epidote

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

Milky Quartz (Common Quartz)

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Gneiss

Gneiss (High-Grade Metamorphic Rock)

Gneis

Gneiss (High-grade metamorphic rock)

Milky Quartz with Mica and Pyrite

Quartz (SiO2) with Muscovite (KAl2(AlSi3O10)(OH)2) and Pyrite (FeS2)

Blue Sapphire

Corundum (Al2O3 with iron and titanium trace elements)

Pink Feldspar

Orthoclase Feldspar (KAlSi3O8)

Granite Gneiss with Garnet

Garnetiferous Gneiss

Gneiss with Quartz Veining

Gneiss (High-grade Regional Metamorphic Rock)

Quartz with Magnetite or Schorl inclusion

Silicon Dioxide (SiO2) with Fe3O4 or NaFe3(Al6)(BO3)3Si6O18(OH)4

Banded Gneiss (with possible weathered sulfide or iron staining)

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

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within a metamorphic matrix

Eclogite (retrograded)

Eclogite (Omphacite-Garnet rock)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Grain)

Silicon Dioxide (SiO2)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Black Onyx

Silicon Dioxide (SiO2) with parallel banding

Garnet Schist

Garnetiferous Micaceous Schist

Lapis Lazuli

Complex rock primarily containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2

Quartz / Quartzite

Quartz (Silicon Dioxide, SiO2)

Blue Apatite

Apatite group (Ca5(PO4)3(F,Cl,OH))

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz Pebble with Matrix

Quartz (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (specifically Clear Quartz or Rock Crystal)

Silicon Dioxide (SiO2)

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Green Quartzite

Quartzite (primarily SiO2 with chlorite inclusions)

Pyrite

Iron Sulfide (FeS2)

Quartzite

Quartzite (primarily SiO2)

Unakite

Altered Granite (Epidotized Granite)

Gneiss (specifically Epidote-Quartz Gneiss)

Gneiss containing Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)) and Quartz (SiO2)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)