Åkermanite from USA
USA | |
| Mineralogical Society of America - Handbook of Mineralogy |
| Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. |
| Mineralogical Society of America - Handbook of Mineralogy |
| Mineralogical Society of America - Handbook of Mineralogy |
| Contrib. Mineral. Petrol. 74, 143-152 (1980) EOS: 60: 423. |
| Rocks & Minerals: 66(3): 196-224. |
Iron Hill deposit, White Earth Mining District, Gunnison County, Colorado, USA