Category Silicate Crystal system Hexagonal | Formula
(repeating unit) BaAl2Si2O8 Space group P63/mcm | |
Crystal class Dihexagonal dipyramidal (6/mmm)
H-M symbol: (6/m 2/m 2/m) Unit cell a = 5.29, c = 15.56 [Å] (approximated) | ||
Hexacelsian is a rare barium silicate mineral with the formula BaAl2Si2O8. It was discovered in the Hatrurim Basin in Israel, where the Hatrurim Formation of rocks formed due to pyrometamorphism is exposed.
Relation to other minerals
As suggested by its name, hexacelsian is related to celsian. This relation is polymorphous (celsian, a feldspar-group mineral, is monoclinic). Beside celsian it is chemically similar to cymrite.
References
Hexacelsian Wikipedia(Text) CC BY-SA