Powellite from selected localities.
USA | |
| Tucker, W. Burling & Reid J. Sampson (1941), Recent developments in the tungsten resources of California: California Journal of Mines and Geology, California Division Mines (Report 37): 37(4): 571-572; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 268; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 339. |
| Tucker, W. Burling & Reid J. Sampson (1941), Recent developments in the tungsten resources of California: California Division Mines Report 37: 570; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 294; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 339. |