The first natural tetrakalsilite has been discovered in some ejected blocks of Somma-Vesuvius volcano, characterized by pyroxene-nepheline-melilite mineralogical association. This mineral was until now known as synthetic phase only in the nepheline-kalsilite system. Lattice parameters, density and chemical composition are reported.
Referenze Bibliografiche
[1] F. A. BANNISTER (1942) - Kalsilite, a polymorph of $KAlSiO_{4}$ from Uganda, «Min. Mag.», 26.
[2] F. A. BANNISTER, TH. G. SAHAMA e H. B. WIIK (1953) - Kalsilite in Venanzite from San Venanzo, Umbria, Italy, «Min. Mag.», 30.
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[4] M. DE' GENNARO e E. FRANCO (1976) - Pirosseno fassaitico in alcuni proietti del Somma-Vesuvio, «Rend. Acc. Sc. Fis. Mat.», 43.
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[6] TH. HAHN e M. BUERGER (1955) - The detailed structure of Nepheline, $KNa_{3}Al_{4}Si_{4}0_{16}$, «Z. Krist.», 106.
[7] A. HOLMES (1942) - A suite of volcanic rock from south-west Uganda containing Kalsilite (a polymorph of $KAlSiO_{4}$), «Min. Mag.», 26.
[8] J. M. PARKER (1972) - The domain structure of Nepheline, «Z. Krist.», 136.
[9] A. J. PERROTTA e J. V. SMITH (1965) - The crystal structure of kalsilite $KAlSiO_{4}$, «Min. Mag.», 35.
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[11] TH. G. SAHAMA (1957) - Complex nepheline-kalsilite phenocrysts in Kabfumu lava, Nyiragongo area, North Kivu in Belgian Kongo, «Jour. Geol.», 65.
[12] TH. G. SAHAMA e J. V. SMITH (1957) - Trikalsilite, a new mineral, «Am. Min.», 42.
[13] J. V. SMITH e TH. G. SAHAMA (1957) - Order-disorder in kalsilite, «Am. Min.», 42.
[14] J. V. SMITH e O. F. TUTTLE (1957) - The nepheline kalsilite Sistem; I: X-Ray data for the crystalline phases, «Am. Jour. Sc.», 255.
[15] O. F. TUTTLE e J. V. SMITH (1958) - The Nephelin kalsilite System; II. Phase relations. «Am. Jour. Sc.», 256.
Con il contributo del Ministero per i Beni e le Attività Culturali