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USA | |
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| [var. Opaline] Clark, A. M. (1993) Hey's Mineral Index - Mineral Species, Varieties and Synonyms (3rd ed.) Natural History Museum, London. |
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| USGS MRDS database (2005), loc. file ID #10031657. |
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| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
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| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
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| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
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| USGS MRDS database (2005), loc. file ID #10031632. |
- Knoxville Mining District
| [var. Prase Opal] Rocks&Min 11(8):117 |
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| Sherlock, R.L. and Lehrman, N.J. (1995), Occurrences of dendritic gold at the McLaughlin Mine. Mineralium Deposita: 30 (3-4): 323-327. |
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| Pemberton, H. Earl (1983) Minerals of California. Van Nostrand Reinhold Company Inc.
Rogers, Austin Flint (1931b), Castanite, a basic ferric sulphate from Knoxville, California: American Mineralogist: 16: 397
Van Nostrand Reinholt Press: 273. |
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| USGS MRDS database (2005), loc. file ID #10212662.
California Geology (1981): 185, figure 2 (September, 1981) |
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| Weaver, C.E. (1949): Geology and Mineral Deposits of an Area North of San Francisco Bay, California: California Division of Mines Bulletin 149: 98-104. |
McLaughlin Mine, Knoxville, Knoxville Mining District, Napa County, California, USA