Minerals

• What is a mineral? (Georgia State University Hyperphysics web site)
• WebMineral, a commercial mineral database---very informative. Look around. You will find flame test spectra and all kinds of good chemistry, physics and images.
  • Tutorial on crystallography and mineral crystal systems. Very readable.
  • Minerals by COLOR

Images and crystal structures

• Crystal structures of quartz (SiO2)
• Polymorphs of quartz shows rotating animations of the a,b,c planes inside the unit cell.
• Quartz and related structures shows atoms in the unit cell. Several ways to view the unit cell.
• Quartz and cholesterol

Examples of others

• Krennerite (compound of gold and tellurium)
  • Crystal structure and geometry
  • Sample on view at the Smithsonian
  • WOW scroll down to see the forms, cell dimensions, etc.
• Smithsonite (Zinc Carbonate)
  • Data
  • James Smithson