Mixed: Igneous And Sedimentary

Hematite

Iron Oxide (Fe2O3)

Milky Quartz

Silicon Dioxide (SiO2)

Pyrite in Matrix (Fool's Gold)

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Tiny rounded metallic-looking pebble, possibly pyrite or a metal-rich mineral

Uncertain from image; possible pyrite (FeS₂), chalcopyrite (CuFeS₂), or magnetite (Fe₃O₄)

Calcite

Calcium Carbonate (CaCO3)

Pyrite

Iron Sulfide (FeS2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Pyrite

Iron Sulfide (FeS2)

Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Natural freshwater pearls

Pearl (nacreous calcium carbonate; chiefly aragonite, CaCO₃)

Magnetite Ore

Magnetite (Fe3O4)

Magnetite

Magnetite (Fe3O4)

Quartz

Silicon Dioxide (SiO2)

Agate

Silicon Dioxide (Chalcedony variety), SiO2

Agate

Silicon Dioxide (Chalcedony), SiO2

Quartz (Pebble)

Silicon Dioxide (SiO2)

Quartz Crystal Rock

Silicon Dioxide (SiO2)

Yellow Calcite

Calcium Carbonate, CaCO3

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Faceted)

SiO2 - Silicon Dioxide

Faceted Clear Quartz or Diamond Simulant

Silicon Dioxide (SiO2) if Quartz or Cubic Zirconia (ZrO2) if Synthetic

Leopard Skin Jasper

Orbicular Jasper (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

Druzy Quartz

Silicon Dioxide (SiO2)

Magnetite / Ironstone

Iron(II,III) oxide (Fe3O4)

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Quartz Crystal

Silicon Dioxide (SiO2)

Galena

Lead Sulfide (PbS)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Agate/Jasper pebble)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Geode (Unopened)

Quartz/Chalcedony concretion

Feldspar

KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8 (Feldspar group)

Carnelian / Agate

Silicon Dioxide (SiO2) - Chalcedony