The Olivine (Mg, Fe) 2SiO4 of USA has been studied with two dimensional X-ray diffracto meter (D8 discover with GADDS). The two distinct phases of orthorhombic structure, one with Mg8 [Fe2 SiO4] and the other with Mg2 SiO4 is observed. We also observed phase transitions due to presence of iron and Silicon preferably the structural change of Mg8[Fe2 SiO4] from orthorhombic to spinnel like (spinnel chord) structure. Magnesium ions in Mg8[Fe2 SiO4] shuffle, arrange at the five vertices of a pentagon and the remaining three at the central but with displaced position from the plane of the pentagon, Thus resulting into a three dimensional spinnel chord like structure. We evidenced the same from diverse orientations of phase peaks and indeed from Kossel lines.
MASOOM YASIN ZAI ,SALMA JABEEN ,SYED MOHSIN RAZA ,KURT ERLACHER ,MUHAMMAD ASHFAQ AHMED ,
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