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Indonesia | |
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| [Opal-A var. Opal-AN] Rod Martin personal collection |
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| [var. Precious Opal] Sun, T. T., Mok, P. C., Paul, S. L., Paramita, M., Arps, C. E., Atichat, W., ... & Wijaya, K. (2008). Precious Opal from Java (Gemmological properties, micro-and nano-structures) Date: 10-05-2008.
Extra Lapis - English No. 10 Opal |
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| Collection of Alex Earl, and obtained from local miners |
- Rejang Lebong District (Rediang Lebong District)
| Barton, M. D., Kieft, C., Burke, E. A. J., Oen, I. S. (1978) Uytenbogaardtite, a new silver-gold sulfide. The Canadian Mineralogist, 16 (4) 651-657 |
- Central Sulawesi Province
| Syafrizal, Tomy Alvin Rivai, Kotaro Yonezu, Damar Kusumanto, Koichiro Watanabe, and Arie Naftali Hawu Hede. (2017) "Characteristics of a Low-Sulfidation Epithermal Deposit in the River Reef Zone and the Watuputih Hill, the Poboya Gold Prospect, Central Sulawesi, Indonesia: Host Rocks and Hydrothermal Alteration" Minerals 7, no. 7: 124. https://doi.org/10.3390/min7070124 |
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| Lowenstern, J. B., van Hinsberg, V., Berlo, K., Liesegang, M., Iacovino, K., Bindeman, I. N., & Wright, H. M. (2018). Opal-A in glassy pumice, acid alteration, and the 1817 phreatomagmatic eruption at Kawah Ijen (Java), Indonesia. Frontiers in Earth Science, 6, 11. |
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| Sujatmiko, Dr H. C. Einfalt, Dr U. Henn (2007) Opal from Java, Indonesia and Its Varieties. http://www.hagi.or.id/paper/opal-from-java-indonesia-and-its-varieties/ |
- Gunung Bijih District (Grasberg District)
| Prendergast, K. (2003). Porphyry-related hydrothermal systems in the Estberg District, Papua, Indonesia (Doctoral dissertation, James Cook University). |
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| [var. Opal-CT] Mazot, A., Bernard, A., Sutawidjaja, I.S. (2007) Hydrothermal system of the Papandayan Volcano, West Java, Indonesia and its geochemistry evolution of thermal water after the November 2002 eruption. Jurnal Geologi Indonesia, 2:1, 15-29. |
Batur Volcano, Bangli Regency, Bali Province, Indonesia