Quartz from selected localities.
USA | |
| Agar, William M. (1933), Notes on the Danbury granodiorite gneiss. American Journal of Science: series 5, 25: 1-19. |
| Tony Nickischer |
http://mineral-resources.findthebest.com/l/103431/Ritch-Diorite-Gneiss-Rock-Quarry | |
self-identified | |
http://mineral-resources.findthebest.com/l/66538/Voorhis-Diorite-Gneiss-Rock-Quarry |
Unnamed construction site, Greenwich, Fairfield County, Connecticut, USA