The Mines and Minerals of Lavrion - AlabanditeLast Updated: 30th Oct 2019
By Branko Rieck
ALABANDITE, MnS, isometric
Alabandite was reported from Villia in Petrascheck (1977) as a written communication by Marinos without any details. It has not been possible so far to confirm this report with any further samples. The existence of alabandite in the Lavrion Mining District was confirmed however by a new find at Siri in October 2019.
Alabandite occurs as small (<1 mm) black grains included in manganese-bearing calcite. On freshly broken surfaces a metallic luster can be observed. Otherwise it quickly becomes a dull, dark grey. There are no crystal faces discernible.
It is found in thin veinlets of calcite in the host rock adjacent to a granitoid body. The calcite matrix shows a strong fluorescence in LW and SW UV light and contains tiny inclusions of reddish iron-bearing phases.
The only confirmed (by modern methods) locality is Siri in the Thorikos area. At an occurrence at the beach of Siri a small granitoid body is visible. The host rock above and to the east (the western edge is not accessible) contains thin veinlets of calcit that in a few instances have been shown to contain alabandite.
Fig. 2: Black, metallic grains of alabandite in calcite.
Petrascheck, W. E. (1977): Die Metallogenese von Laurium - granitischer Herd oder Paläokarst? Annales Géologiques des Pays Helléniques 28, 17-27 (in German).
Thanks go to Dr. Uwe Kolitsch for constructive comments and diligent proofreading to improve this article.
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