Ryzí měď z dolu Kovárna v Obřím dole v Krkonoších
Václav Macháček, Petr Janák, Petr Pauliš
Native copper from Kovárna Mine at Obří důl, Krkonoše Mts. (Czech Republic) Native copper together with gypsum, chrysocolla and devillin was found in the mediaval Kovárna Mine at Obří důl in the Krkonoše Mts. It forms few red brown grains in the size of 1 - 2 mm. It was apparently formed by the weathering of Cu and Fe sulphides (pyrite and chalcopyrite).