Igneous, Sedimentary, Metamorphic, And Mineral

Quartz (Milky/Crystalline variety)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Pink Feldspar

Potassium Feldspar (Microcline or Orthoclase), KAlSi3O8

Orange Calcite

Calcium Carbonate (CaCO3)

Hematite

Hematite (Α-Fe2O3)

Quartz

Silicon Dioxide (SiO2)

Quartz Fragment

Silicon Dioxide (SiO2)

Quartz

Silicon dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Graphite

Graphite (Carbon, C)

Banded Gneiss

Gneiss (Metamorphic Rock)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz (Tumbled)

Silicon Dioxide (SiO2)

Quartz (Small Fragment)

Silicon Dioxide (SiO2)

Gneiss

Metamorphic Gneiss

Yellow Calcite

Calcium Carbonate (CaCO3)

Hematite

Iron (III) oxide (Fe2O3)

Pyrite

Iron Disulfide (FeS2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Citrine and Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Potassium Feldspar

Orthoclase (KAlSi3O8)

Yellow Calcite

Calcium Carbonate (CaCO3)

Pyrite

Iron Disulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Pyrite (Iron Pyrites)

Iron Sulfide (FeS2)

Gneiss

Gneiss (High-grade metamorphic rock)

Gneiss (Banded Gneiss Cobble)

Gneiss

Quartz (Clear or Cloudy)

Silicon Dioxide (SiO2)

Greenschist

Chlorite Schist

Gneiss

Gneiss (Foliated Metamorphic Rock)

Dark rounded pebble

Likely basalt or another fine-grained mafic volcanic rock; exact identification is uncertain from the image

Green Gneiss

Metamorphic Gneiss