The late Variscan rare-metal granitoids of western Bohemia are typical with high- to very-high contents of fluorine and lithium, expressed in appearance of zinnwaldite, topaz and amblygonite as rock-forming minerals.

We offer you possibility to visit the most interesting localities in short excursion following the official post-LERM excursion.

Preliminary program :

- start of the excursion: Praha, 25. June afternoon, immediately after the LERM excursion

- visited localities:

Day 1. - Podlesí - well outcropped stock of highly fractionated peraluminous F,P,Li- rich granite with evolution of marginal pegmatite, early explosive breccia, comagmatic dykes with magmatic layering, unidirectional solidification textures and late intra-dyke brecciation. Main topics: minerals and textures of F-rich magma, dynamic evolution of F-rich magma in subvolcanic conditions.

Day 2. - Krásno - stock of tin-bearing F, Li-rich granite with explosive breccia, greisenisation and Sn-W mineralization. Topics: post-magmatic F-rich alteration, ore minerals.

or Vernéřov near Aš - amblygonite pegmatite with cassiterite, kosterite and assemblage of late phosphates. (locality Krásno or Verneřov will be chosen according to interest of participants.)

- end of the excursion: Praha international airport, 27. June, 10.00 a.m.

- preliminary price: 80 EUR (incl. transport, 2x accommodation, full board), it depends of number of participants, should be paid at the registration.

In case of your interest, please contact Karel Breiter, Czech Geological Survey Praha (breiter@cgu.cz).