In response to yet another frame materials question, I thought it might be useful to start with a more answerable question. One answer per material please, with an example of a bicycle frame using that material.

Please use the format I've used in my answer(s) to make it easy to compare materials.

I see no harm in having all 400+ steel alloys listed if someone wants to do that, but "steel" must specifically be low-grade mild steel rather than a specific alloy. Likewise for aluminium, titanium, magnesium and other metals. For composites, including metal composites, I would again prefer specific examples with details (there's a big difference between steel reinforced concrete and kevlar/polyester composites). I would also love to see weird and wonderful bikes included.

Materials (ie index to answers. Please update links as you add an answer):

• 3D Printed (not yet written)
• Aluminium Bikes
• Regular aluminium alloys (not written yet)
• Scandium aluminium alloy
• Bamboo
• Bones
• Cables aka Tensegrity or Tensional Integrity
• Carbon Fibre
• Cardboard (not yet written)
• Flax fiber (90% flax, 10% carbon)
• Gold (pure) (theoretical)
• Magnesium (not written yet)
• Steel Bikes
  • ChromeMoly Steel (not written yet)
  • Gaspipe Steel
  • Ishtawa Steel (not written yet)
  • Mild Steel
  • Reynolds Steel (needs extension)
• Titanium
• Wood Bikes
  • Carved Wood
  • Plywood (composite)
  • Wood (complete frame and bicycle)