Squigly Squigly's Brain Teasers

Question:

In marble walls as white as milk,
Lined with skin as soft as silk,
In a fountain crystal clear,
A golden treasure does appear.
There are no doors to this stronghold,
Yet thieves break in and steal the gold.

What is it?

Answer:

An egg.

Try another Brain Teaser:

I have lots of keys but I can't open anything. What am I?

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