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Rendiconti Lincei

, 2:371 | Cite as

Antimonian asbecasite in a syenitic ejectum within the Vico pyroclastic rocks (Roman potassic province)

  • Giancarlo Della fnVentura
  • Adriana Maras
  • Annibale Mottana
  • Gian Carlo Parodi
  • Michele Sacerdoti
  • Francesco Saverio Stoppani
Article

Abstract

Asbecasite is present in the vugs of a holocrystalline ejectum mainly made up of sanidine occurring at Tre Croci near Vetralla, in the lower pyroclastic unit of the Vico complex of the Quaternary Roman potassic province of Latium, Italy. The mineral chemistry is characterized by abundant Sb substituting for As, and by lack of Tl and Sn. Therefore, this asbecasite, which crystallized in an igneous environment, has a chemical signature different from that of asbecasite from the type-locality, Cherbandung in the Binna valley of Switzerland, which formed in an alpine cleft.

Key words

Asbecasite Arsenic Antimony Vico complex Roman potassic province 

Asbecasite antimomfera in un proietto sienitico delle piroclastiti vicane (provincia magmatica romana)

Riassunto

Le cavita di un proietto olocristallino composto in prevalenza da sanidino, rinvenuto a Tre Croci presso Vetralla nell’unita piroclastica di base del complesso vulcanico di Vico della provincia potassica romana, contengono rari cristalli di asbecasite, minerale noto finora solo nelle fessure degli gneiss della falda Monte Leone, al Pizzo Cervandone tra la val di Binna (Svizzera) e la val Devero (Italia). L’asbecasite vicana e ricca in Sb e priva di Sn e Tl. È quindi chimicamente differenziata da quella alpina, in accordo con la sua origine, non metamorfica bensi magmatica.

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Copyright information

© Accademia nazionale dei Lincei 1991

Authors and Affiliations

  • Giancarlo Della fnVentura
    • 1
  • Adriana Maras
    • 1
  • Annibale Mottana
    • 1
  • Gian Carlo Parodi
    • 2
  • Michele Sacerdoti
    • 3
  • Francesco Saverio Stoppani
    • 4
  1. 1.Dipartimento di Scienze della TerraSezione mineralogico-cristallografica Universit à degli Studi di Roma «La Sapienza»Roma
  2. 2.Dipartimento di Scienze della Terra Museo di MineralogiaUniversita degli Studi di Roma «La Sapienza»Roma
  3. 3.Istituto di Mineralogia e PetrografiaUniversita degli Studi di FerraraFerrara
  4. 4.Roma

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