- Lower Silesian Voivodeship
| Pieczka, A., Evans, R. J., Grew, E. S., Groat, L. A., Ma, C., & Rossman, G. R. (2013). The dumortierite supergroup. II. Three new minerals from the Szklary pegmatite, SW Poland: Nioboholtite,(Nb0. 6⃞0. 4) Al6BSi3O18, titanoholtite,(Ti0. 75⃞0. 25) Al6BSi3O18, and szklaryite, ⃞Al6BAs33+ O15. Mineralogical Magazine, 77(6), 2841-2856. Evans, R.J. (2011): Holtite and dumortierite from the Szklary Pegmatite, Lower Silesia, Poland. Mineralogical Magazine 75, 303-315. Pieczka, A. Grew, E.S. Groat, L.A. |
Kateřina Coal Mine, Radvanice, Trutnov District, Hradec Králové Region, Czech Republic