These specimens came out of this mine many years ago and are one of the rarest associations from Bolivia. This piece is a great combination of two rather rare minerals. Zinkenite is lead antimony sulfide and Stannite is copper iron tin sulfide. The Zinkenite crystals are the elongated silvery colored crystals, and the Stannite crystals are the dark "brass" colored crystals. This is a very choice specimen of a hard to find combo from Bolivia! 2.9 x 2.7 x 1.8 cm