zeolite type 4a 0 1 g caf sub 2 0 5 1 u00b0 c 5 mgcl sub 2 6h sub 2 o 100 g synthetic zeolite type 4a 0 2 g al sub 2 o sub 3 0 2 g 2 u00b0 c 6 mgcl sub 2 6h sub 2 o 100 g synthetic zeolite type 4a 0 6 g sio sub 2 0 03 2 u00b0 c 7 mgcl sub 2 6h sub 2 o 100 g casio sub 3 nh sub 2 o 0 03 g sic 0 3 4 u00b0 c 8 mgcl sub 2 6h sub 2 o 100 g caco sub 3 0 01 g caf sub 2 0 01 g 6 u00b0 c 9 mgcl sub 2 6h sub 2 o 100 g none 25 u00b0 c 10 mgcl sub 2 6h sub 2 o 100 g synthetic zeolite type 4a 1 g sic 1 g 0 5 u00b0 c glass fibers holding air bubbles__________________________________________________________________________ a mixture in which 0 01 gram of magnesium silicate was added to 100 grams of magnesium chloride was put in a glass vessel and the vessel was held in an electric furnace at 150 u00b0 c until the mixture melted completely thereafter.