It's new for me also.

http://translate.google.com/translate?hl=ru&sl=ru&tl...

"It is not a diamond. Hardness of this phase (lonsdaleite) 1.54 times higher than that of diamond, and since we have here a nanosized crystallites of cubic diamond and lonsdaleite - it is very sticky matrix that defines high performance Popigai impactites. Lonsdaleite share in some specimens can reach 70%, "- said the official.