In Which An Iron-Clad Snail Is Considered

Crysomallon squamiferum's the news,
Not as a brand-new species but because
Defense contractors seek to make some use
Of its sulfur-and-iron shell. The buzz
Is 'bout it's layered structure and design:
An inner layer, highly calcified,
A middle that's organic and a fine
And tough exterior: iron sulfide.
To piercing, crushing, bending, this shell is
Resistant as all hell. It would be great
If people could wear armor such as this
When needed - so damned hard to penetrate!
So cheers now to this funky steampunk snail
And to our friends who hope to don its mail!