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The mineral chemistry of dioritic rocks from Wadi Araba, southwest Jordan, has been determined by electron microprobe, with special emphasis on the amphiboles. These are calcic amphiboles, according to Leake (1978), since all analyses have (Ca + Na) > 1.34 and Na B < 0.67. The observed chemical variations in the amphiboles are attributed to a combination of edenite, pargasite, hornblende...
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