Crossword Genius

Being stony, gives nothing to a friend (4)

Ross

I believe the answer is:

opal

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

'being stony gives nothing to a friend' is the definition.
I can't tell whether this defines the answer.

'nothing to a friend' is the wordplay.
'nothing' becomes 'o' (looks like zero - 0).
'to a friend' becomes 'pal' (pal is a kind of friend).
'o'+'pal'='OPAL'

Can you help me to learn more?

(Other definitions for opal that I've seen before include "Mineral, usually iridescent" , "Milky iridescent stone" , "Precious stone" , "Milky-white gem" , "often semi-transparent" .)

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