Titanoholtite Explained

Titanoholtite
Category:	Silicate mineral
Formula:	(Ti0.75[]0.25)Al6BSi3O18
Imasymbol:	Thlt^[1]
System:	Orthorhombic
Class:	Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m)
Symmetry:	Pbcm
Unit Cell:	a = 47.00 Å, b = 11.83 Å c = 20.24 Å
References:	^[2] ^[3]

Titanoholtite is an extremely rare mineral with the formula (Ti_0.75[]_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).

Notes on chemistry

Impurities in titanoholtite are mainly antimony and arsenic, with trace niobium, tantalum, titanium, and iron.

Notes and References

1. Warr. L.N.. 2021. IMA–CNMNC approved mineral symbols. Mineralogical Magazine. 85. 3. 291–320. 10.1180/mgm.2021.43. 2021MinM...85..291W. 235729616. free.
2. 10.1180/minmag.2013.077.6.10 . The dumortierite supergroup. II. Three new minerals from the Szklary pegmatite, SW Poland: Nioboholtite, (Nb_0.6〈_0.4)Al₆BSi₃O₁₈, titanoholtite, (Ti_0.75〈_0.25)Al₆BSi₃O₁₈, and szklaryite, 〈Al₆BAs³⁺₃O₁₅ . Mineralogical Magazine . 77 . 6 . 2841 . 2013 . Pieczka . A. . Evans . R. J. . Grew . E. S. . Groat . L. A. . Ma . C. . Rossman . G. R. . 2013MinM...77.2841P . 51740732 .
3. Web site: Titanoholtite: Titanoholtite mineral information and data . Mindat.org . 2016-03-03.