Glue LR rubble together?

[Gatorfreak]

I have some LR rubble that I want to glue/cement together to form one larger rock. Any suggestions on what to use that will be permanent and safe? It's all dry as of now.

 

[RMPD109]

Check out the sight listed below. They have at least one other type listed as well. I have never used it so cant comment on that. Good luck

http://www.drsfostersmith.com/product/prod_display.cfm?pcatid=3962&ref=3055&subref=AN&N=2004+113008