You may have heard of mineral sunscreens, sulfur for acne treatment, or miraculous clay face masks. These skin care products are based on inorganic compounds and minerals. Some inorganic compounds cannot penetrate dermal layers, yet do an excellent job on the skin's surface. E.g. main ingredients of mineral sunscreens are Zinc Oxide and Titanium Oxide.
Others are well absorbed and influence aspects of the skin from within: interaction with skin antioxidant enzymes, influence on collagen production, and antibacterial activity turn minerals into strong advocates of the firm and flourishing skin.