In this study we attempt to distinguish the relationship between the altered chromites and non-altered ones by X-ray diffraction. For the purpose of this study, an assemblage of altered/non-altered and deformed/non-deformed ophiolitic chromites has been collected and analyzied. Sharp and doubled peaks are resulted from non-altered and altered samples respectively. By using XRD studies, the...

Petrography: The interior of the stone consists of relatively small (mean grain size 1.6 mm), angular olivine grains (~73 vol%) in an iron metal matrix (Fig. 1). Ferric oxides are abundant. Samples easily fragment because of the weathering and numerous, probably preterrestrial, fractures. Olivine contains numerous small (typically 50 μm diameter) inclusions, visible in the SEM, that consist of ...

Investigation of parent magma evolution and origin chromites in Cheshmeh-Bid, ophiolite Neyriz, Fars

ABSTRACT The aim of this current study was to prepare LnCrO3 (Ln= La, Pr, Nd) in order investigate the influence lanthanides ions on structural and color properties chromites. powders were synthesized by microwave-assisted auto-combustion method using urea as a fuel. After calcination at 800 1000 °C, characterizations performed X-ray diffraction (XRD), scanning electron microscopy (SEM), transm...