Need porous stones for fragrancing

Need your HELP! I work for a fragrance company and (http://maplered.com) we have developed our own Home Fragrance Line. One of our line extensions that I would like to incorporate are Scented Stones. This would replace the normal botanical potpourri. I have seen in many fragrance products, scented Stone (http://g603.net) s of various shapes, sizes and (http://maplered.com) Material (http://g654.org) s. I do know that some of them are made of sythetic Material (http://g654.org) s, but I was looking for a Stone (http://g603.net) type that is porous enough to hold fragrance oils. Does anybody have any guidance or information of that would helpl me? I am located in NJ and (http://maplered.com) hope that their is either a local distributor or sales rep that could help me out. Thanks in advance, Christine