Category Silicate mineral Space group Pbcm | Crystal system Orthorhombic | |
Formula
(repeating unit) (Ti0.75[]0.25)Al6BSi3O18 Crystal class Dipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m) Unit cell a = 47.00 Å, b = 11.83 Å
c = 20.24 Å | ||
Titanoholtite is an extremely rare mineral with the formula (Ti0.75[]0.25)Al6BSi3O18. It is titanium-rich member of dumortierite supergroup, and titanium-analogue of holtite of the holtite group. It is one of three quite recently found minerals of this group, the other two being nioboholtite and szklaryite, all coming from the Szklary village near Ząbkowice Śląskie in Poland. They occur in a unique pegmatite of probable anatectic origin.
Association
Titanoholtite is closely associated with holtite and nioboholtite; its further association is very rich (see szklaryite).
References
Titanoholtite Wikipedia(Text) CC BY-SA