Lots of good lapidary material comes out of Mexico, and I've been fortunate to be the recipient of a small satchel of rocks from what I believe was mined in an area in the state of Chihuahua. Agua Nueva, Coyamito, Berrendo, and Leguna Lace agate all come from mines relatively close in proximity to each other so I consider the stones related.
The stones I have came from the playhouse collection and I don't know how they found their way to Arizona. The small pile of nodules are all coated with a white soft chalky substance, and every stone I have cut has exceeded expectations so far. What is surprising to me is the range of colors and patterns that come from what look to be all the same material. Brilliant oranges, reds, and violets distinguish these rocks.
Since I don't have many of these stones, I save them for special occasion cutting. And since all my cutting sessions are special occasions, I usually do one or two mexicans the same time I do a batch of other stuff.
I really like this stuff and would like to make a connection with the source to get more of this material.