Improved foam glass products prepared from natural glasses, such as unexpanded fine perlite ore and expanded fine perlite, methods of producing the improved foam glass products, and methods of use thereof are provided. The improved foam glass product made from natural glasses has, for example, a thermal conductivity less than 0.70 Btuin/hrFft.sup.2 (0.101 W/m.degree. K) at 73.degree. F.(296.degree. K), a compressive strength greater than 100 PSI (689 kPa) and a density less than 20 lb/ft.sup.3 (320 kg/m.sup.3). The improved foam glass product made from natural glasses may be used in a variety of applications including thermal and acoustic insulation applications.