The matrix is then cooled in stages in a carefully controlled fashion.
During this cooling process the crystals form and must be precisely monitored. Cooling too slowly
will not produce crystal growth, while cooling too quickly will cause the crystals to shatter and
fragment into tiny pieces.
After the matrix is cooled, the product is called a "boule", which is a solid object containing crystallized and
non-crystallized material. The boule is broken up (actually with a big hammer) and the crystals are extracted.
The crystals are a heavy, hard and molecularly dense material that to the eye closely resemble an uncut diamond
crystal. The un-crystallized material is not wasted and is used again as a charge phase for the next run.