Examples from the Web for silicium
Avoid sand crucibles, as silicium may be reduced and absorbed by the aluminum, inducing brittleness.
Silex (silicium combined with oxygen) is contained in the hair and in some of the secretions.
The two elements to be avoided by the founder are silicium and sulphur.
Silicium has been discovered combined with iron to the extent of 3-1/2 per cent.
Of these, silicium is the most usual, and there is probably no cast iron that does not contain a portion of it.