Sedimentary And Metamorphic

Blue Apatite

Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)

Kyanite

Kyanite (Al2SiO5)

Blue Apatite

Apatite (Group), Ca5(PO4)3(F,Cl,OH)

Garnet Schist

Almandine Garnet Schist (Fe3Al2(SiO4)3 in Schistose matrix)

Blue Calcite

Calcium Carbonate (CaCO3)

Magnetite (Small Granule)

Magnetite (Fe3O4)

Kyanite

Kyanite (Al2SiO5)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Zoisite with Ruby

Anyolite (Calcium aluminum hydroxy silicate with Corundum) Ca2Al3(SiO4)3(OH)

Pyrite in Matrix (Fool's Gold)

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Garnet-Mica Schist

Garnetiferous Porphyroblastic Schist

Almandine Garnet in Schist

Almandine Garnet (Fe3Al2(SiO4)3) in Mica Schist

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Magnetite

Magnetite (Fe3O4)

Pyrite

Iron Sulfide (FeS2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Garnet (Almandine)

Almandine, Fe3Al2Si3O12

Riverstone (Quartzite or Siltstone cobble)

Quartzite (primarily SiO2)

Blue Apatite

Fluoroapatite (Ca5(PO4)3F)

Specular Hematite

Specularite (Fe2O3)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz

Silicon Dioxide (SiO2)

Kyanite

Kyanite (Al2SiO5)

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Orange Calcite

Calcium Carbonate (CaCO3)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Fluorite, Turquoise, and Calcite set

Calcium Fluoride (CaF2), Hydrous Phosphate of Copper and Aluminum (CuAl6(PO4)4(OH)8·4H2O), Calcium Carbonate (CaCO3)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Pyrite

Iron Sulfide (FeS2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Graphite

Graphite (C)

Yellow Calcite

Calcium Carbonate (CaCO3)

Quartz Crystal Fragment

Silicon Dioxide (SiO2)

Note: Image shows a biological specimen (Rat), not a rock. Representative geological equivalent: Galena (due to lead-grey colors in fur).

Galena (PbS)

Pyrite

Iron Sulfide (FeS2)

Pyrite (on the right) and Magnetite or Hematite (on the left)

Iron Sulfide (FeS2) and Iron Oxide (Fe3O4 or Fe2O3)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)