With this a photo of raw mica such as it is found. Mica belongs to an important and rather big group of minerals, suitable for many applications. For us is only Muscovite mica and Phlogopite mica of importance. Muscovite mica is a transparent material, suitable for optical use such as belong others mica protectiondiscs for sightglasses, mica protectionshields for transparent level gauge glasses and mica window plates, but also as electric insulating material. Phlogopite mica is a grey/brown colored material and not suitable for optical use, but very useful for electrical insulation.