Výskyt vzácného Ag-Hg sulfidu - imiteritu - v materiálu z haldy dolu Lill (černojamské ložisko), březohorský rudní revír, Česká republika

Pages 62-68
Bulletin mineralogicko-petrologického oddělení Národního muzea v Praze | 2009/17/2

A rare Ag-Hg sulfide, imiterite, was found at mine dump of the mine Lill, the Černojamské ore deposit, Příbram, central Bohemia (Czech Republic). Imiterite forms crystals up to 0.5 mm in length with metallic luster forming aggregates in small cavity of gangue represented by dominant quartz/dolomite-ankerite with minor calcite and siderite. In reflected light it is greyish white with bireflectance (bluish - greish pink) and anisotropic with rotation tints in shades greish blue to reddish brown. It has a mean VHN (20 g load) of 126 (115-133) kp.mm-2 with KVH 1.16. Imiterite is monoclinic, space group P21/c, the unit-cell parameters refined from the X-ray powder data are: a 4.038(1), b 8.006(1), c 6.582(1) Å, β 107.09(2)o and V 203.4(3) Å3. Its chemical composition (mean of 7 points), Ag 45.34, Hg 41.63, Bi 0.05, As 0.18, S 12.85, total 100.05 wt. % corresponds to empirical formula Ag2.04Hg1.01As0.01S1.94 on the basis of 5 apfu. The ore minerals, arsenopyrite, Hg-rich galena, pyrarargyrite, sphalerite and stephanite were determined in close association and data for their chemical composition are given. The studied imiterite probably represents one of the youngest results of crystallization in low-temperature conditions (T < 100 °C).

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