Sedimentary And Igneous

Turquoise

Turquoise - CuAl6(PO4)4(OH)8·4H2O

Red Hematite

Iron(III) Oxide (Fe2O3)

Gneiss

Gneiss (Metamorphic rock composed primarily of Quartz, Feldspar, and Mica/Amphibole)

Carnelian (Chalcedony)

Silicon Dioxide (SiO2)

Fluorite

Calcium Fluoride (CaF2)

Chalcedony (Botryoidal)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Fluorite

Calcium fluoride (CaF2)

Clear Quartz

Silicon Dioxide (SiO2)

Pyritic Gneiss

Metamorphic Gneiss with Pyrite inclusions

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Granitic Gneiss

Gneiss (Metamorphic rock of granitic composition)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Gneiss (with Quartz and Biotite Mica)

Gneiss

Milky Quartz

Silicon Dioxide (SiO2)

Quartz / Rock Crystal

Silicon Dioxide (SiO2)

Clear Quartz Cluster

Silicon Dioxide (SiO2)

Clear Quartz (Druzy)

Crystalline Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Banded Gneiss

Gneiss

Orange Calcite

Calcium Carbonate (CaCO3)

Green Calcite

Calcium Carbonate (CaCO3)

Gneiss

Gneiss (High-grade Metamorphic Rock)

Gneiss

Gneiss (High-grade regional metamorphic rock)

Pyrite

Iron Sulfide (FeS2)

Quartz Geode

Silicon Dioxide (SiO2)

Biotite Mica

Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Hematite

Hematite (Iron(III) oxide, Fe2O3)

Gneiss

Gneissic Metamorphic Rock (Mineral composition: Quartz, Feldspar, Amphibole/Biotite)

Quartz (Milky/Chalcedony variety)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Garnet Gneiss

Gneiss containing almandine-pyrope garnet

Gneiss

Gneiss

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Chalcedony (Botryoidal or Tumbled)

Chalcedony (SiO₂)

Pyrite (Iron Pyrites)

Iron Sulfide (FeS2)

Gneiss

Gneiss

Blue Calcite

Calcium Carbonate (CaCO3)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Quartz (Citrine or Smoky variety)

Silicon Dioxide (SiO2)