I have never used pur minerals but I have been using bare minerals since 2002. I looked on the pur minerals website and they have pressed mineral make up which can't be purely minerals because you need to add a chemical that makes it "pressed" or clumped together. Bare minerals are all loose powder. I love bare minerals and advocate it to anyone who asks. Good products, especially if you don't like the "cake" on feeling of some other foundation products and want a natural light feeling.