Formed during upper-mantle (75-100 km, 900-1,000 Deg C., 20-30 kbar) metasomatism of chromian spinel in peridotite xenolith in a kimberlite pipe. Included in spinel surrounded by li ndsleyite.
IMA Status:
Approved IMA 1989
Locality:
Bultfontein diamond mine, Kimberley, Cape Province, South Africa. Link to MinDat.org Location Data.
Name Origin:
Named for John Barry Hawthorne, formerly chief geologist (Diamonds), DeBeers Consolidated Mines, South Africa.