Moon Rock Marijuana Anyone familiar with the world of cannabis culture has probably at some point heard about moon rocks. Despite the fact that moon rocks are one of the strongest forms of marijuana anywhere in the world, these little treasures are still relatively obscure. But not anymore. This guide to moon rocks will cover everything you need to know so you can discover the mind-blowing joys of these super potent nugs. First things first. Let’s get our vocab straight: the term moon rock is sometimes used to describe pure MDMA crystals. But that’s not what we’re talking about here. We’re talking about cannabis moon rock. You might also hear people refer to it as cannabis caviar.Moon rocks are a cannabis enthusiasts dream come true. Strictly speaking, the moon rock isn’t an exact strain. They’re nugs of cannabis—oftentimes Girl Scout Cookies—that have been soaked in hash oil and then covered with a rich layer of pure kief.