Feldspar Group from selected localities.
USA | |
| [var: Perthite] Wilson,W.F and McKenzie, B.J , 1978, Mineral Collecting Sites In North Carolina, Information Circular 24 |
U.S Bureau of Mines/Spatial Data from the Minerals System/Mineral Industry Location System(Mas/Mils)CD-Rom,Sep,1995 | |
U.S Bureau of Mines, Sep 1995 |