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Single-crystal and powder X-ray diffraction data were collected to characterize the mac­roscopic solid-solution and cation-ordering behavior in the system augite-jadeite (low ac- mite content). We examined 28 natural pyroxenes with compositions on the join augite- jadeite and with different degrees of order. Annealing experiments were carried out to obtain crystals with different degrees of order (P2/n) and complete disorder (C2/c) at compositions between 35 and 60% Jd. Three synthetic C2/c pyroxenes with composition Di 80 Jd 20,  Di 60 Jd 40 . and Di 50 Jd 50  were also examined.

Structural mechanisms of solid solution and cation ordering in augite-jadeite pyroxenes: I. A macroscopic perspective