Abstract :
[en] The quarry of "La Flèche" at Bertrix shows metamorphic rocks containing garnet, ilmenite and plagioclase. Several mineral species produced by retrograde metamorphism are also observed in diaclases. Among these minerals, the most interesting ones are surely those of the zeolite family (7 species), REE-bearing carbonates and arsenates, as well as pumpellyite-(Al), for which Bertrix is the type locality. The present paper describes the rich mineralogy of that quarry, in which 7 minerals are reported for the first time (agardite-(Y), analcime, asbolane, calcioancylite-(Nd), clinoclase, heulandite-Ca, stellerite).
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