| Reference Type | Journal (article/letter/editorial) |
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| Access Rights | Open Access |
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| Title | Senaite from syenite pegmatite at Tvedalen in the southern part of the Oslo Region, Norway |
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| Journal | Norsk Geologisk Tidsskrift
[Norwegian Journal of Geology] | ISSN | 2387-5852 |
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| Authors | Larsen, Alf Olav | Author |
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| Year | 1989 | Volume | 69 |
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| 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_69_4_235-238.pdf+ |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 16669938 | Long-form Identifier | mindat:1:5:16669938:8 |
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| GUID | 0 |
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| Full Reference | Larsen, Alf Olav (1989) Senaite from syenite pegmatite at Tvedalen in the southern part of the Oslo Region, Norway. Norsk Geologisk Tidsskrift [Norwegian Journal of Geology], 69 (4) 235-238 |
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| Plain Text | Larsen, Alf Olav (1989) Senaite from syenite pegmatite at Tvedalen in the southern part of the Oslo Region, Norway. Norsk Geologisk Tidsskrift [Norwegian Journal of Geology], 69 (4) 235-238 |
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| In | (1989) Norsk Geologisk Tidsskrift [Norwegian Journal of Geology] Vol. 69 (4) Norsk Geologisk Forening (Geological Society of Norway) |
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| Abstract/Notes | Senaite, the plumboan member of the crichtonite group, has been found in a syenite pegmatite in a larvikite quarry at Bjørndalen in the Tvedalen area in the southem part of the Oslo Region. Senaite occurs as well-formed interpenetration twins up to 4 x 1 mm large with c as the twin axis. The colour is black with a submetallic adamantine lustre. The streak is greenish black. The density is 4.96(1) g/cm3 (measured) and 4.93 g/cm3 (calculated). The unit cell dimensions found by least squares refinement based on an X-ray diffractogram are (trigonal, space group R3 or R˜3) a= 10.418(1) Å, c= 20.928(2) Å, V= 1967.1(3) Å3. Chemical analysis yields the structural formula Pb1.13(Ti13.66Fe3+3.44Fe2+1.22Zn1.87Mn0.55Y0.26Nb0.15)?21.5O38 which is in close agreement with the general formula AM21O38. Crystallization of senaite, which contains the chalcophile elements Pb and Zn, requires a hydrothermal fluid with an extremely low H2S fugacity, typically found in syenites, alkali granites and certain hydrothermal veins. |
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