gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1965.035.269.09 Rhombohedral Molybdenite from the Minas Da Panasqueira, Beira Baixa, Portugal Clark A. Horrell B.Sc., A.R.S.M. Department of Geology, University of Manchester1

Present address: Dept. of Geology, McGill University, Montreal.

 3 1965 35 269 69 71 9 12 1963 Copyright © 1965, The Mineralogical Society 1965 Summary

Rhombohedral (3R) molybdenite has hitherto been reported from only one locality. Its mode of occurrence at a new locality is reported in this paper. At Panasqueira it occurs as a rare accessory in greisenized granite with which wolframite-cassiterite-quartz veins are associated. In the veins themselves only normal hexagonal (2H) molybdenite has been detected.