Best Practice Guidelines
Collect all pieces together.
Bore and pin all major pieces.
Use epoxy to hold pins in place.
Use epoxy along line of cracking to join broken faces.
TENAX is a recommended epoxy which has record of satisfactory use over many years.
Existing pins if any should be removed and holes extended in diameter and length if necessary and pins replaced with stainless steel pins.
Replaced elements should be mortared into place.
If broken into too many small pieces these can be rearranged and placed on a desk with surround to hold in place.