Brastad, Kjartan (1984) Julgoldite from Tafjord, Sunnmøre. Contribution to the Mineralogy of Norway, No. 67. Norsk Geologisk Tidsskrift [Norwegian Journal of Geology], 64 (3) 251-255
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Access Rights | Open Access | ||
| Title | Julgoldite from Tafjord, Sunnmøre. Contribution to the Mineralogy of Norway, No. 67 | ||
| Journal | Norsk Geologisk Tidsskrift [Norwegian Journal of Geology] | ISBN | 0029-196X |
| Authors | Brastad, Kjartan | Author | |
| Year | 1984 | Volume | 64 |
| Page(s) | 251-255 | Issue | 3 |
| Publisher | Norsk Geologisk Forening (Geological Society of Norway) | ||
| URL | |||
| Download URL | https://njg.geologi.no/images/NJG_articles/NGT_64_3_251-255.pdf+ | ||
| Classification | Not set | LoC | Not set |
| Mindat Ref. ID | 16668132 | Long-form Identifier | mindat:1:5:16668132:1 |
| GUID | 6d4fca8e-fae1-4c84-8f38-093aeabf35ed | ||
| Full Reference | Brastad, Kjartan (1984) Julgoldite from Tafjord, Sunnmøre. Contribution to the Mineralogy of Norway, No. 67. Norsk Geologisk Tidsskrift [Norwegian Journal of Geology], 64 (3) 251-255 | ||
| Plain Text | Brastad, Kjartan (1984) Julgoldite from Tafjord, Sunnmøre. Contribution to the Mineralogy of Norway, No. 67. Norsk Geologisk Tidsskrift [Norwegian Journal of Geology], 64 (3) 251-255 | ||
| In | (1984) Norsk Geologisk Tidsskrift [Norwegian Journal of Geology] Vol. 64 (3) Norsk Geologisk Forening (Geological Society of Norway) | ||
| Abstract/Notes | Julgoldite occurs in open fissures in a Precambrian granitic gneiss situated between Tafjord and Fjøra. Mineral growth in the fissures started under medium or low grade conditions and was completed, after a break, under very low grade conditions. The julgoldite-bearing association consists of calcite + quartz ± chlorite ± laumontite ± babingtonite ± julgoldite ± hematite ± titanite. Julgoldite crystals are very scarce and are found as small inclusions in calcite crystals or in equilibrium with calcite + laumontite ± titanite. The composition of this julgoldite (s.s.) is intermediate, ranging from 62% to 86% of the julgoldite component, and with an average composition corresponding to the formula (Ca7.88Na0.17) (Fe2+,Fe3+)3.62 Mn0.05Mg0.27) (Fe3+5.75Al2.25) (Si11.76Al0.24O43.21-39.59) (OH)12.80-16.41· The large cell size of this mineral from Tafjord is indicative of extensive substitution of Fe2+ for Fe3+ and hence a low oxidation state. | ||
Mineral Pages
| Mineral | Citation Details |
|---|---|
| Julgoldite-(Fe2+) |
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