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The Mines and Minerals of Lavrion - Aldridgeite

Last Updated: 30th Oct 2019

By Branko Rieck

Aldridgeite, (Cd,Ca)(Cu,Zn)4(SO4)2(OH)6 Β· 3H2O , monoclinic



General Appearance
Crystals of aldridgeite appear as lath-like crystals, that are usually found in radial sprays, but occasionally also randomly scattered on the matrix. Their color is a uniform blue-green. It can easily be confused with serpierite and devilline.

Paragenesis
Aldridgeite is usually the only mineral in vugs and narrow openings in the host rock. If not, it is accompanied by an unidentified green Cd-Ca-Zn-Cu-S-O-H-Cl-bearing mineral.

Localities
Aldridgeite has so far been identified only from the Esperanza Mine in the Kaminiza area. The occurrence is at the entrance level, nearly at the end of the tunnel.


Fig. 1: The spot where small quantities of aldridgeite were recovered.


Fig. 2: Blue-green sprays of aldridgeite associated with an unidentified Cd-Ca-Zn-Cu-S-O-H-Cl-bearing mineral on calcite.


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





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