A pretty boulangerite specimen from Bottino Mine, Tuscany, Italy. It displays a very dense cluster of fibrous hair like boulangerite needles over a base. The boulangerite has grey-black color and it is sparkling. Siderite lenticular crystals cover the base. For references see the 2018 issue of The Mineralogical Record vol. 49, # 4. In superb condition.

Fascinating!