I would call it simply a buffalo market, as they come in all different sizes and they take over the place. Nice to walk around and see locals bargaining.
What I like the most is that there are no tourists most of the time. You can walk atound by yourself and enjoy local view. It takes about 2 hours to reach it from Lao Cai but rewards in no crowds and beautiful landscape on the way.
Nice for veggies and fruit shopping, loads of clothes too. After all these markets I've been to in Vietnam this one isn't any spectacular but still, is a good city market.