The behaviour of one sort of Romanian diatomite as precursor in the synthesis of calcium and magnesium silicates was studied. The calcination of this diatomite, 3 h at 10000C in air, does not produce major modifications in structure and composition. In the same conditions, the thermal reaction between diatomite and calcium carbonate leads to a mixture of calcium silicates (CaSiO3, Ca2SiO4, Ca3SiO5) whereas the reaction product with magnesium oxide is orthomagnesium silicate (Mg2SiO4 - forsterite). This sort of Romanian diatomite can play the same role as other silica sources in the synthesis of alkaline-earth silicates.

Abstract. The water catchment area of the Trotuş river lies on about 4340 square kilometers of which 66% are in the mountain area of the Central

Abstract:All those who spent our holidays in the countryside to our gradparents or relatives, we heard about the elders' stories about storms that rained frogs and fish.