Larsen, Alf Olav (1988) Helvite group minerals from syenite pegmatites in the Oslo Region, Norway. Contribution to the mineralogy of Norway, No. 68. Norsk Geologisk Tidsskrift [Norwegian Journal of Geology], 68 (2) 119-124
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Access Rights | Open Access | ||
| Title | Helvite group minerals from syenite pegmatites in the Oslo Region, Norway. Contribution to the mineralogy of Norway, No. 68 | ||
| Journal | Norsk Geologisk Tidsskrift [Norwegian Journal of Geology] | ISBN | 0029-196X |
| Authors | Larsen, Alf Olav | Author | |
| Year | 1988 | Volume | 68 |
| Issue | 2 | ||
| Publisher | Norsk Geologisk Forening (Geological Society of Norway) | ||
| URL | |||
| Download URL | https://njg.geologi.no/images/NJG_articles/NGT_68_2_119-124.pdf+ | ||
| Classification | Not set | LoC | Not set |
| Mindat Ref. ID | 16526527 | Long-form Identifier | mindat:1:5:16526527:0 |
| GUID | 0 | ||
| Full Reference | Larsen, Alf Olav (1988) Helvite group minerals from syenite pegmatites in the Oslo Region, Norway. Contribution to the mineralogy of Norway, No. 68. Norsk Geologisk Tidsskrift [Norwegian Journal of Geology], 68 (2) 119-124 | ||
| Plain Text | Larsen, Alf Olav (1988) Helvite group minerals from syenite pegmatites in the Oslo Region, Norway. Contribution to the mineralogy of Norway, No. 68. Norsk Geologisk Tidsskrift [Norwegian Journal of Geology], 68 (2) 119-124 | ||
| In | (1988) Norsk Geologisk Tidsskrift [Norwegian Journal of Geology] Vol. 68 (2) Norsk Geologisk Forening (Geological Society of Norway) | ||
| Abstract/Notes | Most helvite group minerals from the syenite pegmatites in the Oslo Region are manganese rich with helvite mol% ranging from 65% to 98.5%. From the present investigation on sixteen helvite group minerals, only two fall in the genthelvite field of the helvite-danalite-genthelvite triangular composition diagram. Yellow helvite (98-98.5 mol% helvite) from the Saga I quarry at Mørje, Porsgrunn and a very pale green genthelvite (98 mol% genthelvite) from Bratthagen in Lügendalen are among the purest helvite group end members hitherto reported. The Saga and Sandøy helvites are the first examples of fluorescence among the manganese rich helvites. | ||
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