Quartz from Melaphyre quarry, Grzędy, Gmina Czarny Bór, Wałbrzych County, Lower Silesian Voivodeship, Poland
Poland | |
| Awdankiewicz M. & Szymański M. 2009: New data on the structure, emplacement mode and post-magmatic alteration of the Grzędy trachyandesites (Lower Permian), the Intra- Sudetic Basin. Mineralogia - Special Papers, vol. 34, p. 11 |