Heulandite Subgroup from
USA | |
| Pemberton, H. Earl (1983) Minerals of California. Van Nostrand Reinhold Company Inc. Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 219 Graton, Louis Caryl & D.H. McLaughlin (1917), Ore deposition and enrichment at Engels, California: Economic Geology: 12: 18 Van Nostrand Reinholt Press: 377. |
| Castor, Stephen B., Ferdock, Gregory C. (2004) Minerals of Nevada. Special Publication 31. Nevada Bureau of Mines and Geology |