| Reference Type | Journal (article/letter/editorial) |
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| Title | Heklaite, KNaSiF6, a new fumarolic mineral from Hekla volcano, Iceland |
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| Journal | Mineralogical Magazine |
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| Authors | Garavelli, A. | Author |
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| Balić-Žunić, T. | Author |
| Mitolo, D. | Author |
| Acquafredda, P. | Author |
| Leonardsen, E. | Author |
| Jakobsson, S. P. | Author |
| Year | 2010 (February) | Volume | 74 |
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| Issue | 1 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/rruff_1.0/uploads/MM74_147.pdf+ |
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| DOI | doi:10.1180/minmag.2010.074.1.147Search in ResearchGate |
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| Generate Citation Formats |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 244051 | Long-form Identifier | mindat:1:5:244051:8 |
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| GUID | 0 |
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| Full Reference | Garavelli, A., Balić-Žunić, T., Mitolo, D., Acquafredda, P., Leonardsen, E., Jakobsson, S. P. (2010) Heklaite, KNaSiF6, a new fumarolic mineral from Hekla volcano, Iceland. Mineralogical Magazine, 74 (1) 147-157 doi:10.1180/minmag.2010.074.1.147 |
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| Plain Text | Garavelli, A., Balić-Žunić, T., Mitolo, D., Acquafredda, P., Leonardsen, E., Jakobsson, S. P. (2010) Heklaite, KNaSiF6, a new fumarolic mineral from Hekla volcano, Iceland. Mineralogical Magazine, 74 (1) 147-157 doi:10.1180/minmag.2010.074.1.147 |
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| In | (2010, February) Mineralogical Magazine Vol. 74 (1) Mineralogical Society |
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| Abstract/Notes | Heklaite, with the ideal formula KNaSiF6, was found among fumarolic encrustations collected in 1992 on the Hekla volcano, Iceland. Heklaite forms a fine-grained mass of micron- to sub-micron-sized crystals intimately associated with malladrite, hieratite and ralstonite. The mineral is colourless, transparent, non-fluorescent, has a vitreous lustre and a white streak. The calculated density is 2.69 g cm–3. An SEM-EDS quantitative chemical analysis shows the following range of concentrations (wt.%): Na 11.61–12.74 (average 11.98), K 17.02–18.97 (average 18.29), Si 13.48 –14.17 (average 13.91), F 54.88–56.19 (average 55.66). The empirical chemical formula, calculated on the basis of 9 a.p.f.u., is Na1.07K0.96Si1.01F5.97. X-ray powder diffraction indicates that heklaite is orthorhombic, space group Pnma, with the following unit-cell parameters: a = 9.3387(7) Å, b = 5.5032(4) Å, c = 9.7957(8) Å , V = 503.43(7) Å3, Z = 4. The eight strongest reflections in the powder diffraction pattern [d in Å (I/I0) (hkl)] are: 4.33 (53) (102); 4.26 (56) (111); 3.40 (49) (112); 3.37 (47) (202); 3.34 (100) (211); 2.251 (27) (303); 2.050 (52) (123); 2.016 (29) (321). On the basis of chemical analyses and X-ray data, heklaite corresponds to the synthetic compound KNaSiF6. The name is for the type locality, the Hekla volcano, Iceland. |
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