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Austria | |
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| R. Exel: Die Mineralien und Erzlagerstätten Österreichs (1993) |
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Cuba | Mineral Collector 10:118 (1903) |
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Kazakhstan | |
- Karagandy Province (Qaragandy Oblysy; Karaganda Oblast')
| Gems of Kazakhstan, - textbook, Almaty, 1999, v.1, pp. 71-73 (in Rus.) |
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Slovakia | |
|
| Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590 |
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USA | |
|
| Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 282. |
|
| Stoddard, B.H. (1923), Gems and precious stones Mineral Resources U.S., 1920, part 2: 215-218; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 282. |
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| Minerals of Colorado (1997) E.B. Eckels |
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| Jay Ellis Ransom,1974, Gems and Minerals of America |
|
| Ransom, 1974. Gems and Minerals of America |
|
| Ransom, 1974. Gems and Minerals of America |
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| Jay Ellis Ransom,1974,Gems and Minerals of America |
|
| MacFall (1975) Gem Hunter's Guide |
|
| The Mineralogist, v. 9, no. 5, p. 181. |
|
| Extra Lapis - English No. 10 Opal |