Armenite and Calcite on Zoisite/Celsian gneiss - 
Wasenalp, Simplon region, Valais, Switzerland
 
Clear short-prismatic Armenite crystals (to 3 mm), with yellowish lamellar calcite on grey/white striped Zoisite/Celsian gneiss. Rich specimen from an alpine fissure! Wasenalp is considered the world's best occurrence of Armenite, the extremely rare barium analogue of Milarite (cf. LAPIS 7-8/2016). Found in August 2011 in the north-east face of the Armenite zone, ex Stefan Weiß collection