Re: Titanium snails

For a really hard coating you want calcite grown on a polymer framework
as 
in the nautilus (sp) which has to be cut with a diamond saw, which makes
it 
pretty damn hard!

Calcite is Calcium carbonate (aka chalk), which is pretty easy to get
hold 
of in an ecosystem, but when grown on the (organic) polymer framework it
is 
extraordinarily hard.

Its amazing what they teach us chemists

Richard

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