Mixed: Igneous And Sedimentary

Quartz / Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Pyrite in Matrix (Commonly called Fool's Gold)

Iron Sulfide (FeS2)

Gneiss

Gneiss

Pyrite

Iron Sulfide (FeS2)

Grey Chalcedony (Tumbled)

Chalcedony (SiO2)

Quartz

Silicon Dioxide (SiO₂)

Apatite

Fluorapatite (Ca5(PO4)3F)

Gneiss (specifically Granitic Gneiss)

Gneiss (composed primarily of Quartz, Feldspar, and Biotite/Amphibole)

Milky Quartz

Silicon Dioxide (SiO2)

Gneiss

High-grade foliated metamorphic rock

Turquoise and Hematite

CuAl6(PO4)4(OH)8·4H2O (Turquoise) and Fe2O3 (Hematite)

Milky Quartz (or Vein Quartz)

Silicon Dioxide (SiO2)

Magnetite

Magnetite (Fe3O4)

Granite Gneiss

Gneiss (quartz-feldspar dominated)

Quartz

Silicon Dioxide (SiO2)

Gneiss

Gneiss (High-grade metamorphic rock)

Quartz (Milky Quartz)

Silicon Dioxide (SiO₂)

Gneiss (specifically Banded Gneiss)

Gneiss

Quartz (Milky or Common Quartz)

Silicon Dioxide (SiO2)

River Rock (Gneiss/Schist mix)

Foliated Metamorphic Rock (Gneiss)

Granite Gneiss

Felsic Gneiss

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Hematite

Iron(III) oxide (Fe2O3)

Hematite

Ferric oxide (Fe2O3)

Gneiss

Gneiss (High-grade metamorphic rock)

Gneiss

Gneiss

Gneiss

Gneiss

Clear Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Quartz (Milky/Smoky variety)

Silicon Dioxide (SiO2)

Pyrite (Iron Pyrite)

Iron Sulfide (FeS2)

Gneiss (with Quartzite layers)

Gneissic Metamorphic Rock

Banded Gneiss

Gneiss (High-grade metamorphic rock)

Clear Quartz

Silicon Dioxide (SiO2)

Gneiss with Quartz/Feldspar Vein

Quartz-Feldspathic Gneiss

Gneiss (Banded Gneiss)

Gneiss

Gneiss

Gneiss

Hematite

Iron(III) oxide (Fe2O3)

Quartz (Milky or Rough Quartz)

Silicon Dioxide (SiO2)

Carnelian

Carnelian (Silica, SiO2)