Igneous, Sedimentary, Metamorphic

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Pyrite

Iron Sulfide (FeS2)

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Clear Quartz

Silicon dioxide (SiO2)

Magnetite (potentially Hematite-rich)

Magnetite (Fe3O4)

Yellow chalcedony or quartz fragment

Microcrystalline quartz, SiO₂ (tentative; possibly iron-stained chalcedony)

Natural freshwater pearls

Pearl (nacreous calcium carbonate; chiefly aragonite, CaCO₃)

Greenish Metamorphic Rock (likely containing epidote or chlorite)

Metamorphic rock, possibly epidosite or greenstone

Magnetite (Lodestone)

Magnetite (Fe3O4)

Magnetite / Hematite (Iron Ore)

Magnetite (Fe3O4) or Hematite (Fe2O3)

Magnetite (Iron Ore)

Iron(II,III) oxide (Fe3O4)

Pyrite

Iron Sulfide (FeS2)

Gneiss

Metamorphic Gneiss

Graphite

Graphite (C)

Quartz pebble

Silicon dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Yellow Calcite

Calcium Carbonate (CaCO3)

Quartz

Silicon dioxide (SiO2)

Pyrite

Iron Disulfide (FeS2)

Optical Calcite

Calcium Carbonate (CaCO3)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Mixed Mineral Collection

Multi-mineral Assemblage (Quartz, Jasper, Obsidian, Pyrite, etc.)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz Crystal

Silicon Dioxide (SiO2)

Chalcopyrite

Copper Iron Sulfide (CuFeS2)

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Agate

Silicon Dioxide (Chalcedony), SiO2

Agate

Chalcedony (SiO2)

White Quartz

Silicon Dioxide (SiO2)

White Quartz Beads

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz pebble

SiO2

Tumbled Clear Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz (Pink/Rose Quartz or Quartz Crystal)

Silicon Dioxide (SiO2)

White Quartz

Silicon Dioxide (SiO2)

Iceland Spar (Optical Calcite)

Calcite (CaCO3)