Stone urn I pounded into tiny bits (9)

I believe the answer is:

neutrinos

I'm a little stuck... Click here to teach me more about this clue!

'tiny bits' is the definition.
The definition and answer can be both natural objects as well as being plural nouns.
Perhaps you can see an association between them that I don't see?

'stone urn i pounded' is the wordplay.
'stone urn i' can be anagrammed to 'NEUTRINOS'.
However, I'm not clear how the anagram is indicated.

'into' is the link.

Can you help me to learn more?

(Another definition for neutrinos that I've seen is " Particles".)

I've seen this clue in The Independent.

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