Feldspar Group from
USA | |
| Murdoch, Joseph, Webb, Robert W. (1966) Minerals of California, Centennial Volume (1866-1966) - California Division Mines and Geology, Bulletin 189. p.1-559. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Pemberton, H. Earl (1983) Minerals of California. Van Nostrand Reinhold Company Inc. Beverly, Burt Jr. (1934), Graphite deposits in Los Angeles County, California: Economic Geology: 29: 352 Van Nostrand Reinholt Press: 440. |