The stability of CuBiSeCl2 in ambient air and in water was determined as part of this study. The water stability of CuBiSeCl2 was determined by mixing CuBiSeCl2 powder with distilled water for 10 minutes and pipetting several drops of the suspension onto a glass slide. The slide was then left under ambient conditions for 24 hours to allow the water to evaporate. PXRD data were measured before and after water exposure. The air stability was determined by sprinkling CuBiSeCl2 powder onto a glass slide, leaving the slide under ambient conditions for several weeks and measuring PXRD data at regular time intervals.