Igneous, Sedimentary, Metamorphic

Clear Quartz / Rock Crystal

Silicon Dioxide (SiO2)

Quartz (Druzy)

Silicon Dioxide (SiO2)

Quartz (Raw Chunk)

Silicon Dioxide (SiO2)

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Milky Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Green Calcite

Calcium Carbonate (CaCO3)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Quartz (Small Fragment)

Silicon Dioxide (SiO2)

Hematite

Iron(III) oxide (Fe2O3)

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz Sphere

Quartz (Silicon Dioxide, SiO2)

Quartz (Milky/Clear)

Silicon Dioxide (SiO2)

Pyrite

Iron Pyrite (FeS2)

Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Milky Quartz or Moonstone

Silicon Dioxide (SiO2) or Potassium Aluminum Silicate (KAlSi3O8)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Milky and Bull Quartz)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Hematite

Iron(III) oxide (Fe2O3)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Hematite

Iron(III) oxide (Fe2O3)

Gneiss

Gneiss

Gneiss

Gneiss (High-Grade Metamorphic Rock)

Granite Gneiss

Granitoid Gneiss

Epidote

Epidote (Ca2(Al2,Fe3+)3(SiO4)3(OH))

Banded Gneiss

Gneiss (High-grade Metamorphic Rock)

Gneiss with Quartz Veining

Gneiss (High-grade Regional Metamorphic Rock)

Gneiss (Green Gneiss)

Gneiss (High-grade Regional Metamorphic Rock)

Gneiss (Granitic Gneiss)

Gneiss

Gneiss

Gneiss

Biotite Gneiss

Gneiss (complex mixture including Biotite K(Mg,Fe)3AlSi3O10(F,OH)2 and Quartz/Feldspar)

Granite Gneiss

Gneiss (High-grade Metamorphic Rock)

Gneiss

Gneiss (Metamorphic Rock)

Gneiss (with Mica and Quartz)

Gneissic Metamorphic Rock

Gneiss

Gneiss (High-grade Metamorphic Rock)

Banded Gneiss Pebble

Gneiss (Metamorphic Rock)

Banded Gneiss

Gneiss (Metamorphic Rock)

Granitic Gneiss

Gneiss (Metamorphic Rock)

Magnetite

Magnetite (Fe3O4)