| Reference Type | Journal (article/letter/editorial) |
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| Access Rights | Open Access |
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| Title | Pickeringite from Fåvang |
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| Journal | Norsk Geologisk Tidsskrift
[Norwegian Journal of Geology] | ISSN | 2387-5852 |
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| Authors | Broch, Olaf Anton | Author |
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| Broch, Olaf Anton | Author |
| Year | 1931 | Volume | 12 |
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| Page(s) | 117-122 | Issue | 1-4 |
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| Publisher | Norsk Geologisk Forening (Geological Society of Norway) |
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| URL | |
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| Download URL | https://foreninger.uio.no/ngf/ngt/pdfs/NGT_12_117-122.pdf |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 16640706 | Long-form Identifier | mindat:1:5:16640706:8 |
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| GUID | 0 |
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| Full Reference | Broch, Olaf Anton (1931) Pickeringite from Fåvang. Norsk Geologisk Tidsskrift [Norwegian Journal of Geology], 12 (1-4) 117-122 |
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| Plain Text | Broch, Olaf Anton (1931) Pickeringite from Fåvang. Norsk Geologisk Tidsskrift [Norwegian Journal of Geology], 12 (1-4) 117-122 |
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| In | (1931) Norsk Geologisk Tidsskrift [Norwegian Journal of Geology] Vol. 12 (1-4). A.W. Brøggers Boktrykkeri |
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| Abstract/Notes | Some years ago a fibrous mineral was found near the Host sæter at Fåvang in Gudbrandsdalen. The Finder, Mr. Fröisland, sent a sample to the Norwegian Geological Survey for determination. The mineral has a conspicuous silky lustre. In some parts of the specimen the fibres are nearly white, with a faint yellowish tinge only; in other parts they are yellow. Some parts of the specimen are reddish brown, this colour evidently originating from ferric hydroxide. The mineral is easily dissolved in water and has a bitter (astringent ) taste. Qualitative chemical tests proved that it is rich in water. Further, A12O8 (with a very small amount of Fe2O8), MgO and SO4 were easily assigned. CaO and Cl are absent. A determination of the alcalies was carried out by Mr. Emil Klüver, showing Na2O 0.29%, K2O 0.07%. (According to Mr. Klüver the last figure may be too high. It is possible that only traces of K2O are present, the portion available for the analysis being 0,4 g only).
Microscopic examination of the pulverized material proved that the bulk of the specimen consists of an extremely fine fibrous mineral - the macroscopic fibres are composed of numerous subparallel microscopic ones, with nα= 1.473 and nγ= 1.484. (On account of the fineness of the fibres, the measurements are probably not very accurate. The error may be 0.003 ±). The elongation is positive, the angle of extinction ca. 35° (measured on fibres with maximum interference colour ). The fibrous mineral is consequently pickeringite MgO · Al2O3 • 4 SO8 • 22 H2O.
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