LIZARDITE AND ITS PARENT ENSTATITE: A STUDY BY X.RAV DIFFRACTION AND TRANSMISSION ELECTRON MICROSCOPY

摘要: Transmission electron microscopy (TEM) studie's on an orthopyroxene bastite have confirmed the existence of planar structures in lizardite and a variety variously curved serpentine that were observed previous studies. The include simple curves at end ofplanar structures, complete 180. forming hairpin tightly "chrysotile-like" ribbon structures. Single-crystal X-ray-diffraction studies orientation one partly serpentinized grain enstatite reveal complex relationship between parent replacement lizardite-Ir. Forty percent is aligned with X1;r nZ"o, Yt rlYn, \jznxe, 690 'ilith XianZeN Yt"nX^, Zy"ly"n, 60/o 26, 130" X"o,3Vo 4:" al|o Z^and 45Yo random orientation. Although this study applies detail only to studied, it illustrates variations clarifies TEM Lizardite forms two ways: l) either as following planes close-packed oxygen atoms pyroxene, minimum disruption stnrcture, or 2) randomly oriented suggest extensive reorganization anion framework structure. Lizardite, chrysotile antigorite all been identified by TEM. Some gentle others tight rolls. At present diffraction evidence required identify these not available.