Igneous, Metamorphic, Sedimentary

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Crystalline Silicon Dioxide (SiO2)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Pyrite

Iron Sulfide (FeS2)

Zoisite with Rubellite (Ruby in Zoisite)

Zoisite with inclusions of Hornblende (Anyolite)

Zoisite with Ruby

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

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)

Feldspar

KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8 (Feldspar group)

Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Pyrite (FeS2)

Quartz (Iron-stained Quartz)

Silicon Dioxide (SiO2)

Quartz (Raw Chunk)

Silicon Dioxide (SiO2)

Pyrite (Fools Gold)

Iron Disulfide (FeS2)

Quartz (Milky/Snow)

Silicon Dioxide (SiO2)

Blue Apatite

Fluoroapatite (Ca5(PO4)3F)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Magnetite Orthorthotropic Rock

Magnetite (Fe3O4)

Magnetite

Magnetite (Fe3O4)

Magnetite (Small Granule)

Magnetite (Fe3O4)

Pyrite

Iron Sulfide (FeS2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Pyrite in Matrix

Iron Sulfide (FeS2)

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Magnetite / Iron Ore

Magnetite (Fe3O4)

Magnetite (Lodestone)

Magnetite (Fe3O4)

Quartz Boulder

Silicon Dioxide (SiO2)

Mica (Muscovite or Biotite)

Sheet silicate mineral group (e.g., KAl2(AlSi3O10)(F,OH)2)

Agate

Silicon Dioxide (Chalcedony), SiO2

Common Opal

Hydrated amorphous silica (SiO2·nH2O)

Quartz Crystal

Silicon Dioxide (SiO2)

Blue Quartz

Silicon Dioxide (SiO2) with inclusions

Quartz with Matrix

Silicon Dioxide (SiO2)

Quartz Crystal Cluster / Quartzite

Silicon Dioxide (SiO2)

Tumbled Quartz

Silicon Dioxide (SiO2)

Quartz (Orange/Pink variety)

Silicon Dioxide (SiO2)