Les feldspaths potassiques des porphyres de Roffna

Article

Reference

Les feldspaths potassiques des porphyres de Roffna

GYSIN, Marcel

Abstract

K-Felspars of the Roffna-porphyries belong to the group of "triclinic orthoclase". Their optical properties (indicatrix orientation) are similar to those of anorthoclase or of a felspar intermediate between anorthoclase and microcline. Homogenous crystals show 2V values ranging between —76° and —86°. Spotted crystals have a greater range of variation, from — 42° to — 84,5°. Concerning the genesis of the "porphyries", the author suggests that they are of detritic origin, resulting from the erosion of albite-rich rhyolite (quartz-porphyries).

GYSIN, Marcel. Les feldspaths potassiques des porphyres de Roffna. Schweizerische mineralogische und petrographische Mitteilungen, 1963, vol. 43, no. 1, p.

385-405,Pl.I-VIII

DOI : 10.5169/seals-33460

Available at:

http://archive-ouverte.unige.ch/unige:150336

Disclaimer: layout of this document may differ from the published version.

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