Sedimentary And Igneous (Mixed)

Quartz

Silicon Dioxide (SiO2)

Quartz Crystal

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz pebble

Silicon dioxide (SiO2)

White Quartz

Silicon Dioxide (SiO2)

Red Jasper / Carnelian Chalcedony

SiO2 (Silicon Dioxide with Iron Oxide inclusions)

Schist

Schist (Foliated Metamorphic Rock)

Quartz Pebble (Beach Agate / Chalcedony Pebble)

Silicon Dioxide (SiO2)

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Mica Schist fragment

Mica Schist (KAl2(AlSi3O10)(OH)2 / K(Mg,Fe)3(AlSi3O10)(OH)2)

Gneiss

Gneiss

Gneiss

High-grade regional metamorphic rock

River Pebble (Gneiss or Quartzite variant)

Metamorphic rock specimen (likely Quartzite or Gneiss)

Clear Quartz (Tumbled)

Silicon Dioxide (SiO2)

Gneiss

Gneiss (High-grade metamorphic rock)

Gold Nugget / Native Gold

Native Gold (Au)

Pyrite

Iron Sulfide (FeS2)

Green Gneiss or Greenschist

Chlorite/Actinolite Gneiss or Schist

River Pebble (Gneiss/Schist mix)

Metamorphic rock aggregate

Magnetite (Lodestone)

Magnetite (Fe3O4)

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Gneiss with Quartz Veining

Gneiss (High-grade Metamorphic Rock)

Gneiss

Gneiss (High-grade metamorphic rock)

Quartz Geode

Silicon Dioxide (SiO2)

Quartz Crystal Fragment

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Quartz (Common or Milky)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Gneiss with Quartz Veining

Gneiss (High-grade Metamorphic Rock)

Amphibolite

Amphibolite (rich in amphibole and plagioclase feldspar)

Gneiss Pebble

Gneiss (High-grade metamorphic rock)

Quartz Mineral Specimens

Quartz (Silicon Dioxide, SiO2)

Gneiss

Gneiss

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz Crystal

Silicon dioxide (SiO2)

Gneiss

Gneiss (High-grade metamorphic rock)

White Agate / Chalcedony

Silicon Dioxide (SiO2)

Gneiss

Gneiss