Photo: Joy Desor Mineralanalytik

Billietite is an uncommon mineral of Uranium that contains Barium. It usually occurs as clear yellow orthorhombic crystals. Billietite is named after Valere Louis Billiet, Belgian crystallographer at the University of Ghent, Ghent, Belgium.

Formula: Ba(UO₂)₆O₄(OH)₆•8H₂O.
Color: Yellow to golden-yellow, amber-yellow, orange-yellow
Crystal System:    Orthorhombic

From: Menzenschwand, St Blasien, Baden-Württemberg, Germany