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Campostriniite, (Bi (super 3+) ,Na) (sub 3) (NH (sub 4) ,K) (sub 2) Na (sub 2) (SO (sub 4) ) (sub 6) .H (sub 2) O, a new sulfate isostructural with gorgeyite, from La Fossa Crater, Vulcano, Aeolian Islands, Italy

Francesco Demartin, Carlo Castellano and Carlo Maria Gramaccioli
Campostriniite, (Bi (super 3+) ,Na) (sub 3) (NH (sub 4) ,K) (sub 2) Na (sub 2) (SO (sub 4) ) (sub 6) .H (sub 2) O, a new sulfate isostructural with gorgeyite, from La Fossa Crater, Vulcano, Aeolian Islands, Italy
Mineralogical Magazine (August 2015) 79 (4): 1007-1018

Abstract

The new mineral campostriniite, (Bi (super 3+) ,Na) (sub 3) (NH (sub 4) ,K) (sub 2) Na (sub 2) (SO (sub 4) ) (sub 6) .H (sub 2) O, was found in an active fumarole (fumarole FA, temperature approximately 350 degrees 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) Aa, beta = 113.97(1) degrees , V = 2063(1) Aa (super 3) and Z = 4. The six strongest reflections in the powder X-ray diffraction pattern are: [d (sub obs) in Aa (I)(hkl)] 6.396(100)(110), 7.507(75)(2I02), 2.766(60)(3I16), 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 Bi (sub 2.41) N (sub 1.52) Na (sub 2.41) K (sub 0.48) S (sub 6.07) H (sub 8.08) O (sub 25) . The calculated density is 3.87 g cm (super -3) . Using single-crystal diffraction data, the structure was refined to a final R(F) = 0.051 for 3025 independent observed reflections [I > 2sigma (I)]. Campostriniite is isostructural with gorgeyite 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 Bi (super 3+) atoms and minor amounts of Na (super +) ions, an eight-fold coordinated site fully occupied by Na (super +) ions and another eight-fold coordinated site occupied by NH (sub 4) (super +) and K (super +) 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.


ISSN: 0026-461X
EISSN: 1471-8022
Serial Title: Mineralogical Magazine
Serial Volume: 79
Serial Issue: 4
Title: Campostriniite, (Bi (super 3+) ,Na) (sub 3) (NH (sub 4) ,K) (sub 2) Na (sub 2) (SO (sub 4) ) (sub 6) .H (sub 2) O, a new sulfate isostructural with gorgeyite, from La Fossa Crater, Vulcano, Aeolian Islands, Italy
Affiliation: Universita degli Studi di Milano, Dipartimento di Chimica, Milan, Italy
Pages: 1007-1018
Published: 201508
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
References: 34
Accession Number: 2015-099310
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 5 tables
N38°19'60" - N38°25'00", E14°52'00" - E15°00'00"
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201542
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