hessonite การใช้

Some rhodolites will change color from purplish to a hessonite brown when heated to a temperature of 600 癈 . This process cannot be reversed.
Hessonite comes chiefly from Sri Lanka and India where it is found generally in placer deposits, though its occurrence in its native matrix is not unknown.
The different species are pyrope, almandine, spessartine, grossular ( varieties of which are hessonite or cinnamon-stone and tsavorite ), uvarovite and andradite.
It was shown many years ago, by Sir Arthur Herbert Church, that many gemstones, especially engraved gems ( commonly regarded as zircon ), were actually hessonite.
The difference is readily detected by the specific gravity, that of hessonite being 3.64 to 3.69, while that of zircon is about 4.6.