Mixed: Igneous And Sedimentary

Pyrite

Iron Sulfide (FeS2)

Quartz (Milky Quartz)

Quartz (SiO2 - Silicon Dioxide)

Limestone (specifically Bituminous or Carbonaceous Limestone)

Calcium Carbonate (CaCO3) with Organic Impurities

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Pyrite

Iron Disulfide (FeS2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Amphibolite (specifically Hornblende Schist/Gneiss)

Amphibole-rich Metamorphic Rock

Pyrite

Iron Sulfide (FeS2)

Granite Gneiss with Garnet

Garnetiferous Gneiss

Gneiss

Gneiss

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Gneiss with Quartz Veining

Gneiss (High-grade regional metamorphic rock)

Gneiss (Banded Gneiss)

Gneiss

Pyrite

Iron Sulfide (FeS2)

Biotite (Black Mica)

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

Banded Agate (Jasper-Agate)

Silicon Dioxide (SiO₂)

Hematite

Iron(III) oxide (Fe2O3)

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Magnetite (Lodestone variety)

Magnetite (Iron(II,III) oxide, Fe3O4)

Quartz (Milky/Common variant)

Silicon Dioxide (SiO2)

Gneiss

Gneiss (High-grade metamorphic rock)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Schist (specifically Chlorite/Greenschist)

Chlorite Schist

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Pyrite on Quartz

Iron Sulfide (FeS2) on Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Carnelian Agate

Chalcedony (SiO2) with iron oxide inclusions

Agate Geode

Chalcedony (cryptocrystalline SiO2)

Blue Calcite

Calcium Carbonate (CaCO3)

Magnetite / Ironstone

Magnetite (Fe3O4)

Quartz with Iron Stains

Quartz (SiO2) with iron oxide/hydroxide staining

Mica

Phlogopite or Biotite group (KMg3(AlSi3O10)(F,OH)2 / K(Mg,Fe)3AlSi3O10(OH)2)

Milky Quartz

Silicon Dioxide (SiO2)

Bloodstone Jasper (Heliotrope)

SiO2 (Silicon Dioxide) - Cryptocrystalline Quartz

Quartz

Quartz (SiO₂)

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Yellow Chalcedony (Agate Pebble)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Gneiss

Gneiss

Specular Hematite (Specularite)

Iron Oxide (Fe2O3)