Mica is a naturally occurring silicate mineral with several unique properties. The reflective property is particular of mica, and this is the reason it is widely used in cosmetic colour mixes. The sparkle one would notice on someone using a glittering makeup generally comes from a fine mix of this silicate mineral with the product. It is naturally mined in brittle form or as stacks of fine films together. The chemical composition would vary according to the location of mining, but the general formula is the same for all the different types.
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