TAL70CDD: Áliva sphalerites are globally renowned for two things: their transparency/color and crystal size. In this case, the crystal size is undeniable, and although its thickness makes the transparency less visible, it boasts well-defined polycrystalline growth, a rarity in these pieces. Damage-free with some matrix at the base.
Áliva Mine (Las Mánforas Mine), Áliva mining area, Camaleño, Comarca Liébana, Cantabria  Spain

Specimen size: 11.3 × 10 × 8.8 cm = 4.45” × 3.94” × 3.46”

Main crystal size: 5.7 × 5.2 cm = 2.24” × 2.05”