|
USA | |
| Jay Ellis Ransom, 1974, Gems and Minerals of America |
| Campbell, T.J., Roberts, W.L. (1985) Mineral Localities in the Black Hills of South Dakota. Rocks & Minerals: 60(3): 109-118 (117). |
- Jewel Cave National Monument
| Matrix 10:2 pp 81-90 |
| Jay Ellis Ransom,1974,Gems and Minerals of America |
| Roberts, Willard Lincoln, Rapp, George Jr. (1965) Mineralogy of the Black Hills. Bulletin 18. South Dakota School of Mines and Technology |
| Jay Ellis Ransom,1974,Gems and Minerals of America |
| www1.eere.energy.gov (n.d.) http://www1.eere.energy.gov/tribalenergy/guide/pdfs/pine_ridge_12.pdf |
| Jay Ellis Ransom,1974, Gems and Minerals of America |