6.4 Other Materials. Some other materials of special interest for nuclear weapons use are listed below. 6.4.1 Beryllium (Be) Beryllium, element 4, is named after the mineral beryl, which is a natural ore (beryllium aluminum silicate, Be3Al2(SiO3)6, aquamarine and emerald are precious forms of this mineral).
Now you have a piece of fused plastic 6 layers thick. This is a good usable size to make things with. I do not like the method of folding a single bag twice upon itself to make an 8-ply fused piece, because it makes such a small piece, there isn't much you can do with it.