Igneous, Sedimentary, Metamorphic, Mineral

Gneiss

Gneiss (Foliated Metamorphic Rock)

Granite Gneiss

Granitoid Gneiss

Gneiss (Metamorphic Pebble)

Gneissic Metamorphic Rock

Green Gneiss or Greenschist

Chlorite/Actinolite Gneiss or Schist

Biotite Schist

Biotite-rich Schist

Granite Gneiss

Gneiss (High-grade Metamorphic Rock)

Banded Gneiss

Banded Gneiss (High-grade Metamorphic Rock)

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Clear Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Gneiss

Gneiss (Foliated Metamorphic Rock)

Banded Gneiss

Gneiss (Metamorphic Rock)

White Quartz Star

Silicon Dioxide (SiO2)

Gneiss

Granitic Gneiss

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Gneiss

Gneiss (High-grade metamorphic rock)

Quartz

Silicon Dioxide (SiO2)

Yellow Calcite

Calcite (Calcium Carbonate, CaCO3)

Quartz in Matrix

Silicon Dioxide (SiO2)

Schist

Mica Schist

Banded Gneiss Pebble

Banded Gneiss

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Black Sand (Magnetite Sand)

Magnetite-rich Placers (Fe3O4)

Banded Gneiss

Gneiss (Metamorphic Rock)

Quartz (Milky/Rose variety)

Silicon Dioxide (SiO2)

Pyrite (Iron Pyrites)

Iron Sulfide (FeS2)

Banded metamorphic rock, likely gneiss

Biotite–quartz–feldspar gneiss, possibly amphibolite-bearing

Quartz

Quartz (Silicon Dioxide, SiO2)

Gneiss

Gneiss

Quartz pebble

Silicon dioxide (SiO2)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Disulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Hematite

Ferric Oxide (Fe2O3)

Pyrite (Cube variety)

Iron Sulfide (FeS2)

Calcite

Calcium Carbonate (CaCO3)

Pyrite

Iron Disulfide (FeS2)

Quartz

Silicon Dioxide (SiO2)

Milky Quartz (Vein Quartz)

Silicon Dioxide (SiO2)