Crystal system Trigonal | Space group R3m | |
Category Cyclosilicates
Tourmaline group Formula
(repeating unit) CaFe3Al6(Si6O18)(BO3)3(OH)3O Crystal class Ditrigonal pyramidal (3m)
(same H-M symbol) Unit cell a = 16.00, c = 7.21 [Å] (approximated); Z = 3 | ||
Lucchesiite is a new member of tourmaline-group of minerals. Lucchesiite has the formula CaFe3Al6(Si6O18)(BO3)3(OH)3O. It is the calcium and oxygen-analogue of schorl. It has two co-type localizations, one in Czech Republic and the other in Sri Lanka. As the other members of the tourmaline group, it is trigonal.
References
Lucchesiite Wikipedia(Text) CC BY-SA