Aluminum is a silvery white member of
the boron group of chemical elements. It has the symbol Al
and its atomic number is 13. It has an atomic weight of
26.9815386. 
Things you might not know about
Aluminum:
- Since 1972, an estimated 660-plus billion
beverage cans have been recycled—placed end-to-end; they
could stretch to the moon nearly 300 times.
- Aluminum is nonmagnetic and nonsparking.
- Corrosion resistance can be excellent due to
a thin surface layer of aluminum oxide that forms when the metal is
exposed to air, effectively preventing further oxidation.
- Almost all metallic aluminum is produced from
the ore bauxite.
See GC2XAY2 - Hydrogen, for an explanation
about this series of caches.
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