Sedimentary Or Igneous

White Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Milky Quartz

Silicon Dioxide (SiO2)

Botryoidal Agate / Chalcedony Geode

Silicon Dioxide (SiO2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Peacock Ore (Chalcopyrite)

Chalcopyrite (CuFeS2)

Quartz

Silicon Dioxide (SiO2)

Quartz (Grain)

Silicon Dioxide (SiO2)

Quartz in Matrix

Silicon Dioxide (SiO2)

Yellow Calcite

Calcite (Calcium Carbonate, CaCO3)

Fluorite (Green Fluorite)

Calcium Fluoride (CaF2)

Hematite

Iron(III) oxide (Fe2O3)

Blue Calcite

Calcite (CaCO3)

Clear Quartz Crystal

Quartz (Silicon Dioxide - SiO2)

Carnelian

Carnelian (SiO2 - Silicon Dioxide with Iron Oxide impurities)

Pyrite

Iron Disulfide (FeS2)

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Gneiss

Gneiss

Hematite

Iron(III) oxide (Fe2O3)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Cryptocrystalline Quartz (Agate/Chert)

Silicon dioxide (SiO2)

Glacial Granite with Epidote

Granite featuring Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Pyrite

Iron Sulfide (FeS2)

Banded Gneiss

Gneiss (Metamorphic Rock)

Quartz (Milky or Yellowish)

Silicon Dioxide (SiO2)

Pyrite

Iron Disulfide (FeS2)

Banded Gneiss

Gneiss (High-grade Metamorphic Rock)

Fluorite

Calcium Fluoride (CaF2)

Gneiss

Gneiss

Clear Quartz

Silicon Dioxide (SiO2)

White Quartz Star

Silicon Dioxide (SiO2)

Gneiss

Gneiss (High-grade metamorphic rock)

Carnelian

Carnelian (Silicon Dioxide, SiO2)

Pyrite

Iron Disulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Garnet (Almandine/Pyrope variety)

Silicate mineral group; typically Fe3Al2(SiO4)3 (Almandine) or Mg3Al2(SiO4)3 (Pyrope)

Quartz

Silicon dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)