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| Earth Treasures Vol 4, Allan W. Eckert, 1987 |
| Earth Treasures Vol 4, Allan W. Eckert, 1987 |
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| R&M 69:3 pp 156-162 |
| R&M 69:3 pp 156-162 |
| Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 383 Rocks & Minerals: 69(3): 156-162. American Mineralogist 23:898 |
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| R&M 69:3 pp 156-162 |
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