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Sweden | |
| Damman, A.H.(1989): Hydrothermal orthoamphibole-bearing assemblages from the Gåsborn area, West Bergslagen, central Sweden. American Mineralogist. 74, 573-585 |
| Holtstam, Dan, Langhof, Jörgen - Eds. (1999) Långban - The mines, their minerals, geology and explorers. Raster Förlag; Swedish Museum of Natural History, Stockholm. p.1-216. Gatedal, Kjell (n.d.) Personal Communication. |
| Gatedal, Kjell (n.d.) Personal Communication. |
| [var. Oligoclase] Östra Värmlands Mineral Society,Långban,Sweden |
| Nysten, Per (2004) Harstigen ett mineralogisk eldorado i Bergslagen [Harstigen - a mineral eldorado in Bergslagen]. Norsk Bergverksmuseum Skrift, 28. 5-13 |
| Flink, Gustav (1886) Mineralogiska notiser I. 12. Epidot från Mörkhult [Mineralogical notes I. 12. Epidote from Mörkhult]. Bihang til Svenska vetenskapsakademien handlingar, 12 (3) 52-55 |