| Reference Type | Journal (article/letter/editorial) |
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| Title | Campostriniite, (Bi3+,Na)3(NH4,K)2Na2(SO4)6·H2O, a new sulfate isostructural with görgeyite, from La Fossa Crater, Vulcano, Aeolian Islands, Italy |
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| Journal | Mineralogical Magazine |
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| Authors | Demartin, Francesco | Author |
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| Castellano, Carlo | Author |
| Gramaccioli, Carlo Maria | Author |
| Year | 2015 (August) | Volume | 79 |
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| Page(s) | 1007-1018 | Issue | 4 |
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| Publisher | Mineralogical Society |
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| DOI | doi:10.1180/minmag.2015.079.4.10Search in ResearchGate |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 244681 | Long-form Identifier | mindat:1:5:244681:7 |
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| GUID | db6d1dc7-b543-4937-90a5-5a8876b82190 |
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| Full Reference | Demartin, Francesco, Castellano, Carlo, Gramaccioli, Carlo Maria (2015) Campostriniite, (Bi3+,Na)3(NH4,K)2Na2(SO4)6·H2O, a new sulfate isostructural with görgeyite, from La Fossa Crater, Vulcano, Aeolian Islands, Italy. Mineralogical Magazine, 79 (4) 1007-1018 doi:10.1180/minmag.2015.079.4.10 |
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| Plain Text | Demartin, Francesco, Castellano, Carlo, Gramaccioli, Carlo Maria (2015) Campostriniite, (Bi3+,Na)3(NH4,K)2Na2(SO4)6·H2O, a new sulfate isostructural with görgeyite, from La Fossa Crater, Vulcano, Aeolian Islands, Italy. Mineralogical Magazine, 79 (4) 1007-1018 doi:10.1180/minmag.2015.079.4.10 |
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| Abstract/Notes | The new mineral campostriniite, (Bi3+,Na)3(NH4,K)2Na2(SO4)6·H2O, was found in an active fumarole (fumarole FA, temperature ∼350°C) at La Fossa Crater, Vulcano, Aeolian Islands, Sicily, Italy. It occurs on a pyroclastic breccia as white prismatic crystals up to 0.2 mm long, in association with adranosite, demicheleite-(Br), demicheleite-(I), argesite and sassolite. The mineral is monoclinic, space group: C2/c (no. 15) with a = 17.748(3), b = 6.982(1) c = 18.221(3) Å, β = 113.97(1)°, V = 2063(1) Å3 and Z = 4. The six strongest reflections in the powder X-ray diffraction pattern are: [dobs in Å (I)(hkl)] 6.396(100)(110), 7.507(75)(202), 2.766(60)(316), 3.380(57)(312), 5.677(55)(111), 3.166(50)(4 0 2). The empirical formula (based on 25 anions p.f.u.) is Bi2.41N1.52Na2.41K0.48 S6.07H8.08O25. The calculated density is 3.87 g cm–3. Using single-crystal diffraction data, the structure was refined to a final R(F) = 0.051 for 3025 independent observed reflections [I > 2σ(I)]. Campostriniite is isostructural with görgeyite and belongs to the 7.CD group of the Strunz classification system. The structure contains two independent nine-fold coordinated sites, one of them located on a two-fold axis (M1) and the other one in general position (M2) essentially occupied by Bi3+ atoms and minor amounts of Na+ ions, an eight-fold coordinated site fully occupied by Na +ions and another eight-fold coordinated site occupied by NH+4 and K+ ions; three independent sulfate anions in a general position and a water molecule coordinated to M1 and located on a two-fold axis are also present. |
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