Previous Issues
Volume :4 Issue : 1 1977
Add To Cart
Download
Some observations on plagioclase twinning in El-Ineigi granites, Eastern Desert, Egypt
Auther : MAMDOUH A. HASSAN AND MOHAMMED A. HEIKAL
Department of Geology, University of Kuwait, Kuwait arid Department of Geology, King Abdel Aziz University, Jeddah, Saudi Arabia
ABSTRACT
Plagioclase from granites of Gabal El-Ineigi, Eastern Desert, Egypt exhibits most commonly albite and Manebach twinning. Carlsbad and acline (pericline) twinning plagioclase crystals are less common. The characteristics of the twinned plagioclase crystals show that the Manebach twinning is of primary origin, and that the albite twins are of secondary origin.