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The Mines and Minerals of Lavrion - Alabandite

Last 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.

General Appearance
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.

Paragenesis
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.

Localities
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. 1: Siri beach and the outcrop of a granitoid.


Fig. 2: Black, metallic grains of alabandite in calcite.




Reference
Petrascheck, W. E. (1977): Die Metallogenese von Laurium - granitischer Herd oder Paläokarst? Annales Géologiques des Pays Helléniques 28, 17-27 (in German).

Acknowledgements
Thanks go to Dr. Uwe Kolitsch for constructive comments and diligent proofreading to improve this article.




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