| Reference Type | Journal (article/letter/editorial) |
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| Access Rights | Open Access |
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| Title | Gaidonnayite from nepheline syenite pegmatite on Siktesøya in the southern part of the Oslo Region, Norway |
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| Journal | Norsk Geologisk Tidsskrift
[Norwegian Journal of Geology] | ISBN | 0029-196X |
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| Authors | Larsen, Alf Olav | Author |
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| Raade, Gunnar | Author |
| Year | 1991 | Volume | 71 |
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| Page(s) | 303-306 | Issue | 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://njg.geologi.no/images/NJG_articles/NGT_71_4_303-306.pdf+ |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 16669945 | Long-form Identifier | mindat:1:5:16669945:6 |
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| GUID | 3f30b0e0-c66f-4112-a681-132f13ae9a76 |
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| Full Reference | Larsen, Alf Olav, Raade, Gunnar (1991) Gaidonnayite from nepheline syenite pegmatite on Siktesøya in the southern part of the Oslo Region, Norway. Norsk Geologisk Tidsskrift [Norwegian Journal of Geology], 71 (4) 303-306 |
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| Plain Text | Larsen, Alf Olav, Raade, Gunnar (1991) Gaidonnayite from nepheline syenite pegmatite on Siktesøya in the southern part of the Oslo Region, Norway. Norsk Geologisk Tidsskrift [Norwegian Journal of Geology], 71 (4) 303-306 |
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| In | (1991) Norsk Geologisk Tidsskrift [Norwegian Journal of Geology] Vol. 71 (4) Norsk Geologisk Forening (Geological Society of Norway) |
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| Abstract/Notes | Gaidonnayite, (Na2ZrSi3O9 * 2H2O), the orthorhombic dimorph of catapleiite, has been found in small vugs in a nepheline syenite pegmatite dike on Siktesøya, Oslo Region, Norway. The mineral occurs as transparent, colourless to very pale green crystals in aggregates up to l mm across. Gaidonnayite probably formed as the result of hydrothermal alteration of eudialite. The crystals display the forms {001}, {010}, {101} and {120}. The average of 18 electron microprobe analyses gives the following empirical formula: (Na1.52 K0.40 ) ?1.92 (Zr0.92Ti0.07Nb0.02)?1.01Si0.09O9*2H2O. The unit cell dimensions are a= 11.761(8) Å, b = 12.830(6) Å, c= 6.693(4) Å, V= 1009.9(8) Å3. The cell parameters of gaidonnayite show a linear correlation with the potassium content. Gaidonnayite from Siktesøya shows a vivid green fluorescence in short-wave UV light (254 nm). The UV excited fluorescence spectrum is typical of uranyl-activated rninerals. |
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