Check the list of ingredients on your mineral make-up.
Is it full of additives that you can barely pronounce? What do these additves do? Are they necessary?
Many times, no, they are not.
Lipids/oils can clog pores, and also creates a ready breeding ground for bacteria to grow. Oils frequently turn rancid without preservatives added, causing a different set of problems. Many popular brands add in vitamins and minerals. These can cause break-outs in sensitve individuals.
Many brands also contain food-grade additives, like rice powder, or corn starch, which completely negates the whole "non-organic mineral" claims. If your mineral make-up has these additives, the possibility of contamination exists.

The whole point of mineral powder make-up is its' purity. Pure iron oxides, mica, zinc (very soothing to inflamed skin contions), and titanium oxide, are pigments from the earth, and are not able to grow bacteria, yeasts, molds, or other undesirable elements. They lie on top of your skin in thin, over-lapping "sheets", that allow your skin to "breathe". Even if you perspire, or go swimming, the adherance to the skin is such that it is resistant to streaking, or running. It is water-resistant, and a natural sun-screen of about 18-25, depending on your coverage.
You can get a lovely glow that accents YOU. It doesn't just become a mask.
These mineral pigments are already in your favorite liquid or powder foundation, just diluted with many un-necessary and many times harmful, additives. These serve no real purpose, other than to increase profits.
Because pure mineral powder is not diluted, a little goes a long way. You need much less foundation than usual. The pure mineral powder make-up's need no such additives, they do a wonderful job of covering blemishes and imperfections, while allowing you to "glow-through".
Mineral powder cosmetics are fast replacing the out-dated make-up of yester-year.
Belle Saison's mineral powder make-up line, at www.4skinbeauty.com has proven free from harmful food-grade additives and lipids. Belle Saison's make-up contains no talc (a known carcinogen), bismuth oxychloride (an irritant), oils, vitamins, rice powder or corn starch. Check the ingredients on your mineral powder, today. Say "NO" to fillers!

About the Author
Aleta has been in the health an beauty fields for 25 years.