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Incommensurate phase in the kosmochlor-diopside join: A new polymorph of clinopyroxene
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Shizue Sakamoto
,
Norimasa Shimobayashi
Published/Copyright:
March 31, 2015
Abstract
Electron-diffraction patterns of clinopyroxene with an intermediate composition between kosmochlor and diopside show the presence of satellite reflections in diffuse streaks running perpendicular to (111) planes of the C2/c structure. The position of these satellite reflections indicates the existence of an incommensurate (INC) phase. Based on the characteristics of the diffraction patterns, it is suggested that the INC phase consists of a regular arrangement of kosmochlor-rich and diopside-rich slabs with a periodicity 2.6 to 6.0 times the (111) spacing in the C2/c structure. This is a new ordering scheme in clinopyroxenes.
Received: 2003-3-6
Accepted: 2003-5-22
Published Online: 2015-3-31
Published in Print: 2003-10-1
© 2015 by Walter de Gruyter Berlin/Boston
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