reader sent in these rocks, any suggestions?

Can anyone tell me what kind of rock these are?  They are green with white crystals in them which kinda looks like vermiculite.  A few have what looks like barnacles in them instead.  Any ideas would be greatly appreciated.

MelissaKFARM@aol.com

Melissa and My Furry Friends, Reba, Tiger, Lucas and Jagger as well as Cally, Mick and Bufford