Found this pic online, compare.

[berti]

 

[rock]

Yours looks like limestone and if so it wouldnt make a good Celt. Just wouldnt hold up.

 

[trevmma]

man i remember these days,it does looked almost shaped but , i would say nothing
i think if u go back 6 years ago i have some post like this, lol but not for long as i got the eye quick cause i kept open ears and a closed mouth to other respectable members on this site. so i would say just listen and learn