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

Water and Silt (Sedimentary Environment)

Suspended Sediment / H2O (dihydrogen monoxide)

Quartz Geode

Crystalline Silicon Dioxide (SiO2)

Amazonite

KAlSi3O8 (Potassium Feldspar, variety of Microcline)

Eudialyte in Matrix

Na15Ca6(Fe,Mn)3Zr3(Si,Nb) (Si25O73) (OH,Cl,H2O)3

Orthoclase Feldspar

Potassium Feldspar (KAlSi3O8)

Calcite

Calcite (Mineral; CaCO₃)

Yellow Quartz (Citrine appearance)

Silicon Dioxide (SiO2)

Greenschist

Greenschist facies rock

Rhodonite

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

Green Quartz (Aventurine)

Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)

Citrine Quartz

Silicon Dioxide (SiO2)

Garnet

Garnet Group (Silicate mineral); general formula X3Y2(SiO4)3

Emerald

Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities

Quartz

Silicon Dioxide (SiO2)

Gneiss

Gneiss (Metamorphic rock composed primarily of quartz, feldspar, and mica)

Kyanite (Blue Kyanite)

Kyanite (Al2SiO5)

Banded Gneiss

Gneiss (Metamorphic rock of variable mineralogy, often quartz-feldspar base)

Granite Gneiss

High-grade regional metamorphic rock (Quartz-Feldspar Gneiss)

Milky Quartz Pebble with Chert

Silicon Dioxide (SiO2)

Pyrite (on Quartz/Sulfide matrix)

Iron Sulfide (FeS2)

Gneiss (Metamorphic Rock)

Gneiss

Carnelian

SiO2 (Microcrystalline Quartz / Chalcedony)

Hag Stone (Sandstone with Boreholes)

Bored Sandstone (Sedimentary rock with lithophaga-style borings)

Smoky Quartz

Silicon Dioxide (SiO₂)

Garnet in Quartz Matrix

Almandine Garnet (Fe3Al2(SiO4)3) in Quartz (SiO2)

Specular Hematite (Specularite)

Iron Oxide (Fe2O3)

Black Tourmaline

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

Sodalite

Sodalite (Na8Al6Si6O24Cl2)

Mica (Muscovite)

Potassium aluminum silicate - KAl2(AlSi3O10)(OH)2

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Smoky Quartz

Silicon Dioxide (SiO2)

Epidosite

Epidosite (predominantly Epidote {Ca2Al2Fe3+Si3O12(OH)} and Quartz {SiO2})

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Sandstone

Arenite (primarily SiO2)

Schist

Mica Schist

Hematite

Iron(III) oxide (Fe2O3)

Quartz Pebble

Silicon Dioxide (SiO2)

Yellow Quartz (Citrine Quartz)

Silicon Dioxide (SiO2)

Olivine (Peridot)

Olivine Group (Magnesium Iron Silicate), (Mg, Fe)2SiO4

Sandstone

Arenite (primarily SiO2)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)