Perlite is an amorphous mineral, coming from volcanic deposits [ 1, 2, 3 ]. Perlite is a very promising industrial material as during the last 60 years less than the 1% of the existing deposits have been mined. It mainly consists of SiO 2 and Al 2 O 3, with low amounts of other compounds (sodium, potassium, iron, calcium, magnesium) [ 1, 2, 4 ].