They call it Lavender rock, but they are actually a lavender colored rhodactis. Definately NOT ricordia although the price tag is about the same. They will grow larger than ricordia, faster, and split quicker. They also tend to have odd shapes instead of the small round bubbles ricordia have. The body will grow out of round also, were ricordia will stay symetrical for the most part until they are ready to split.
I have numerous types of mushrooms and this has been my experience with them. These are my favorite right up there with the ricordia. Excellent choice and they will get better with age!