Koshava gypsum deposit, (3) Blackville, (4) Tell Abu Hureyra 1, (5) Alatau and Kalu ranges, (6) Laurel...relicts, regmaglypts on the surface crust, lechatelierite (SiO2 ), iron silicides (Fex Siy ), moissanite...coesite (>2.5–3 Gpa and >973 K), mineraloid lechatelierite (SiO2 ; >1973 K, 85 GPa), strongly broken quartz...P). The glass also contains the mineraloid lechatelierite (SiO2 ). At Melrose (Pennsylvania), molten...384]. The presence of mullite, suessite and lechatelierite in particular, testifies to high temperatures |