Note 6 — Chapter VIII · PHYSICAL AND CHEMICAL PROPERTIES OF THE DIAMOND
Reading edition
Artificial tribo-luminescent sphalerite:—
Zinc carbonate100 parts
Flower of sulphur 30 ”
Manganese sulphate½ per cent.
Mix with distilled water and dry at a gentle heat. Put in luted crucible and keep at a bright red heat for from two to three hours.