A golf ball at 16 grams is very light.
First thing I would do is hit one of those smooth areas with a small file to see if it is metallic or a vitreous glaze.
(of course you may be damaging a rare and valuable specimen, Just saying what I would do)
A $15 precious metal test kit will tell you if there are any significant amounts of metallic silver or gold, (search the online auctions to get one)
and you'll be ready for the next time you are wondering 'Is it gold? is it Silver?'
your statement 'i couldnt melt it with a torch. dont even think it got red hot' sounds like stone rather than metal, though it would depend
on your torch and the amount of time you heated it.
Neat looking piece,
Being found 'Inside a rock' is rather strange....
what made you smash open the rock?

I'll assume it was giving you a signal on your MD.
Keep us posted, HH, Herbie
