Valeč
Famous locality for Opal-AN (Hyalite) exploited from 19th century. The specimens from this locality are part of many world museum collections.
The best specimens of botryoidal Opal-AN aggregates are from free boulders of leucitic tephrite surrounded by clay.
The site was turned to military area after WW II. The Czechoslovak and then Soviet Army were discouraging from mineral collecting. Nowadays (2009) the site is still military area but access during the day and outside planned military exercises is possible. The site is also a natural preserve. Currently best place to collect is the summit plateau of Jedliny hill. Former sites exploited were on the hills of Doupovské hory N, NW and W from Valeč: Filíř (Pilíř), Číhaná, Kopáčov, Šibeniční vrch, Malý a Velký Hlavákov (Hlavákovský vrch).
References
Mach Z. Hyalit z Valče. Minerál 1994. 2(3):114.
Mineral List
5 entries listed. 2 valid minerals.
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