Igneous, Sedimentary, And Metamorphic

Gneissic Schist

Gneiss-schist (Metamorphic rock)

Magnetite (Lodestone)

Magnetite (Fe3O4)

Pink Garnet (likely Almandine or Rhodolite)

Garnet Group (Fe3Al2(SiO4)3 to Mg3Al2(SiO4)3)

Milky Quartz

Silicon Dioxide (SiO2)

Blue Calcite

Calcium Carbonate (CaCO3)

Gneiss

Gneiss (Metamorphic Rock)

Gneiss

Gneiss (Metamorphic Rock)

Gneiss

Foliated Metamorphic Rock

Yellow Quartz (Citrine/Yellow Jasper mix)

Silicon Dioxide (SiO2)

Gneiss

Gneiss (High-grade metamorphic rock)

Specular Hematite (Specularite)

Iron(III) oxide (Fe2O3)

Milky Quartz

Silicon Dioxide (SiO2)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Garnet

Almandine (Fe3Al2(SiO4)3)

Quartz pebble

Silicon dioxide (SiO2)

Quartz Sand Gravel

Silicon Dioxide (SiO2)

Gneiss

Metamorphic Gneiss

Gneiss

Gneiss (High-grade metamorphic rock)

Schist

Metamorphic Rock (Schist)

Banded Gneiss

Gneiss (Metamorphic Rock)

Quartz

Quartz (SiO2 - Silicon Dioxide)

Tumbled Mixed Gemstones and Rocks

Various mineral species including quartz (SiO2) and silicate minerals

Quartz (Tumbled)

Silicon Dioxide (SiO2)

Quartz (Clear Quartz)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Hematite

Iron(III) oxide (Fe2O3)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

White Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz Crystal

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz (Rose or Milky Quartz)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Beach Pebble (Quartz / Quartzite)

Silicon Dioxide (SiO2)

Magnetite

Magnetite (Fe3O4)