Igneous, Sedimentary, Metamorphic, And Mineral

Banded Gneiss

Gneiss (quartz-feldspar-biotite metamorphic rock)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Pebble

Clast (specifically a granule or small pebble)

Gneiss (specifically Biotite Gneiss)

Gneiss (high-grade metamorphic rock primarily composed of Silicates)

Gneiss (specifically a Granitic Gneiss)

Gneiss (typically composed of Quartz, Feldspar, and Mica/Amphiboles)

Sodalite (blue beads) and Clear Quartz (clear beads)

Sodalite: Na4Al3Si3O12Cl; Quartz: SiO2

Pyrite

Iron Disulfide (FeS2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Gneiss (Metamorphosed Pebble)

Gneiss with Quartz/Feldspar banding

Gneiss

Gneiss

Pyrite in Matrix (Gold-colored Chalcopyrite or Pyrite)

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

Corundum

Corundum (Aluminium oxide, Al2O3)

Orange Calcite

Calcite (CaCO3)

Gneiss (specifically Pink Gneiss)

Gneiss (high-grade regional metamorphic rock)

Gneiss

Foliated Metamorphic Rock (Gneiss)

Gneiss

Metamorphic Rock (Gneissic texture)

Foliated Gneiss (River-Worn Pebble)

Gneiss (High-grade Regional Metamorphic Rock)

Gneiss

Gneiss

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Gneiss

Gneiss (High-grade metamorphic rock)

Greenschist

Greenschist (Chlorite-Epidote-Actinolite Schist)

Biotite (Black Mica)

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

Quartz

Quartz (SiO₂)

Biotite Mica

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

Clear Quartz (or Rock Crystal)

Quartz (SiO₂ - Silicon Dioxide)

Gneiss

Gneiss

Natural Gemstone Cabochons (Ruby, Moonstone, Emerald, Citrine)

Ruby (Al2O3:Cr), Moonstone (KAlSi3O8), Emerald (Be3Al2(SiO3)6:Cr), Citrine (SiO2)

Gneiss

Gneiss

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Quartz

SiO₂ (Silicon Dioxide)

River Cobble (Gneiss/Migmatite)

Gneissic Metamorphic Rock (composed mainly of Quartz, Feldspar, and Biotite)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Banded Gneiss

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

Black Tourmaline (Schorl)

Schorl (Na(Fe^2+)3Al6(Si6O18)(BO3)3(OH)4)

Milky Quartz

Quartz (Silica / Silicon Dioxide), SiO2

Milky Quartz

Quartz (Silica / Silicon Dioxide, SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Milky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

Iron Ore (Magnetite-Hematite)

Magnetite (Fe3O4) and Hematite (Fe2O3)