Introduction Periodicals Bulletin mineralogicko-petrologického oddělení Národního muzea v Praze 2009/17/1 Andorit IV a andorit VI z Dúbravy v Nízkych Tatrách (Slovenská republika)
Andorit IV a andorit VI z Dúbravy v Nízkych Tatrách (Slovenská republika)
Jiří Sejkora, Daniel Ozdín
The first occurrence of Ag-Pb-Sb sulphosalts was described from Sb mineralization in Tatric Unit in the Western Carpathians. Rare microscopic grains of andorites up to 0.05 mm were identified in antimony deposit Dúbrava (Nízke Tatry Mts., Central Slovakia). Andorites forms inclusions in stibnite. According to microprobe analyses andorite IV and andorite VI were distinguished. Crystallochemical formulas of andorites are following: andorite IV: (Ag13.40Cu2.89)Σ16.29 (Pb15.69Cd0.42Fe0.08Zn0.05Hg0.02)Σ16.26(Sb45.92Bi0.09)Σ46.01(S97.31Cl0.12)Σ97.43 (And95.88) and andorite VI: (Ag0.76Cu0.24)Σ1.00(Pb0.99 Cd0.02)Σ1.01(Sb3.03Bi0.01)Σ3.04(S5.94Cl0.01)Σ5.95 (And100.17). Cu content in andorite VI (1.73 wt. %, 0.24 apfu) is the highest content measured value this element in andorites up to now. Andorite substitution And96.50 is yet highest relevant amount of substitution in andorite IV. Ag-Pb-Sb sulphosalts represented Sb-rich members of lillianite hometypic series (4L) crystallized in final stage after precipitation of stibnite. No further minerals were identified in this mineral assemblage. For andorite IV it is the first occurrence of this mineral in the Slovak Republic.