reference: Georgy A. Belyanin, Jan D. Kramers, Marco A.G. Andreoli, Francesco Greco, Arnold Gucsik, Tebogo V. Makhubela, Wojciech J. Przybylowicz, Michael Wiedenbeck.Petrography of the carbonaceous, diamond-bearing stone Hypatia from southwest Egypt: A contribution to the debate on its origin.Geoc