| Reference Type | Journal (article/letter/editorial) |
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| Access Rights | Open Access |
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| Title | Lorenzenite from the Bratthagen nepheline syenite pegmatites, Lågendalen, 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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| Sæbø, Per Christian | Author |
| Raade, Gunnar | Author |
| Year | 1992 | Volume | 72 |
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| Page(s) | 381-384 | 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_72_4_381-384.pdf+ |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 16671049 | Long-form Identifier | mindat:1:5:16671049:6 |
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| GUID | 878a109a-5f0a-4b36-a2da-2bf35ae3645a |
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| Full Reference | Larsen, Alf Olav, Sæbø, Per Christian, Raade, Gunnar (1992) Lorenzenite from the Bratthagen nepheline syenite pegmatites, Lågendalen, Oslo Region, Norway. Norsk Geologisk Tidsskrift [Norwegian Journal of Geology], 72 (4) 381-384 |
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| Plain Text | Larsen, Alf Olav, Sæbø, Per Christian, Raade, Gunnar (1992) Lorenzenite from the Bratthagen nepheline syenite pegmatites, Lågendalen, Oslo Region, Norway. Norsk Geologisk Tidsskrift [Norwegian Journal of Geology], 72 (4) 381-384 |
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| In | (1992) Norsk Geologisk Tidsskrift [Norwegian Journal of Geology] Vol. 72 (4) Norsk Geologisk Forening (Geological Society of Norway) |
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| Abstract/Notes | Lorenzenite, Na2 Ti2Si2O9 ,from nepheline syenite pegmatites at Bratthagen, Lågendalen, Vestfold county, Norway, occurs in two morphologically different habits: as well-defined orthorhombic crystals or more rarely as fibrous aggregates. Crystal forms observed:{100}, {210}, {1111, {211}, {321}. The unit cell dimensions for Bratthagen lorenzenites are (coarsely crystalline/fibrous): a= 14.488(2)/14.480(1) Å, b = 8.7061 ( 11)/8.6995(8) Å, c= 5.2308(8)/5.2277(3) Å. Dmeas for coarsely crystalline lorenzenite is 3.436(1) gf/m3 . Coarsely crystalline lorenzenite is brown, while fibrous lorenzenite is colourless to pale yellow. It is nonpleochroic, and strongly birefringent. The axial dispersion is distinct r > v. Biaxial negative, 2 V = 42° ± 4°, n > 1.80. The mineral shows yellow fluorescence in short wave UV light. A cathodoluminescence spectrum of coarsely crystalline lorenzenite shows an intrinsic type of luminescence with a maximum at 500 nm. The average of seven electron microprobe analyses gave the following results for coarsely crystalline/fibrous lorenzenite: Na2O 17.13/17.74, SiO2 34.20/35.03, TiO2 44.39/45.13, FeO 0.83/0.34, Nb2O5 2.71/1.40, total 99.26/99.64. The average Fe:Nb ratios are 1: 1.80/1:2.25, indicating substitution according to the scheme Fe2+ + 2Nb5+- 3Ti4+ |
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