Guettardite
Seravezza quarrying basin, Seravezza, Lucca Province, Tuscany, Italy
Aggregate of tabular crystals, blacks, shiny. The guettardite of this location is the best in the world, as described by Dr. Biagioni, in his book: " Minerali della Provincia di Lucca", pagg 159-60, edited by AMI, Associazione Mineralogica Italiana, 2009. Collection and photo of Gianfranco Ciccolini.