Igneous Or Sedimentary (Anthropogenic Modification)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz-veined Metamorphic Pebble

Silicate-rich metamorphic rock with quartz veins (SiO2)

Hematite

Hematite (Fe2O3)

White Quartz

Quartz (Silicon Dioxide, SiO2)

Feldspar

Aluminosilicate (KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8)

Quartz

Silicon Dioxide (SiO2)

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)

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)

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)

Magnetite (Lodestone)

Magnetite (Fe3O4)

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz

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)

Amphibolite

Amphibolite (rich in amphibole and plagioclase feldspar)

Quartz Mineral Specimens

Quartz (Silicon Dioxide, SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz Crystal

Silicon dioxide (SiO2)

White Agate / Chalcedony

Silicon Dioxide (SiO2)

Gneiss

Gneiss

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Quartz (Smoky/Clear variety)

Silicon Dioxide (SiO2)

Magnetite

Magnetite (Fe3O4)

Schist (Chlorite or Mica-rich)

Chlorite Schist

Gneiss (Banded Gneiss)

Gneiss