I've been visiting J&M for 20 years and in all my travels I have never found such an amazing collection of rock, mineral, crystal and other collectable items for sale under one roof. Miguel, Jean Parie and all the staff there are extremely knowledgeable and ready to assist with any questions. Prices are great and although I only get to LV about once a year as I am now in my 70's, I still enjoy stopping there on every visit. Do yourself a favor and dare to make your first trip there next time you are in town, you'll be hooked too! Be prepared to spend at least an hour and still not see everything!