Jeremejevite is a rare aluminum borate mineral with an ideal chemical formula of Al6B5O15[F,OH]3 (K. Scarratt et al., “Jeremejevite: A gemological update,” Fall 2001 G&G, pp. 206–211). Its crystal system is hexagonal, and this mineral tends to occur in pegmatitic or volcanic deposits as a prismatic crystal. The authors recently examined a violetish blue jeremejevite measuring 10.48 × 4.98 × 4.04 mm and weighing 1.78 ct.
Jeremejevite is a rare aluminum borate mineral with an ideal chemical formula of Al6B5O15[F,OH]3 (K. Scarratt et al., “Jeremejevite: A gemological update,” Fall 2001 G&G, pp. 206–211). Its crystal system is hexagonal, and this mineral tends to occur in pegmatitic or volcanic deposits as a prismatic crystal. The authors recently examined a violetish blue jeremejevite measuring 10.48 × 4.98 × 4.04 mm and weighing 1.78 ct.
