Titre du document / Document title

THERMAL EXPANSION OF NEW MINERALS ― ARSENATES OF BRADACHEKITE NaCu₄(As0₄)₃ AND URUSOVITE Cu(AsAlO₅)

Auteur(s) / Author(s)

FILATOV S. K. ; RYBIN D. S. ; KRIVOVICHEV S. V. ; VERGASOVA L. P. ;

Résumé / Abstract

The thermoroentgenography method was used to study, within interval +20―700 °C in air, the thermal behavior of two newly discovered exhalation copper-bearing minerals ― bradachekite and urusovite ― from the Great Tolbachik Eruption (1975―1976, Kamchatka Peninsula, Russia). The main values of the thermal expansion tensor have been calculated as following: urusovite ― α₁₁ = 10, α₂₂ = α_b = 7, α₃₃ = 4, α_V = 21 × 10^―6 °C^―1, μ = c^α₃₃ = 49°; bradachekite ― α_11aver. = 23, α₂₂ = 8, α_33aver. = 6 × 10^―6 °C^―1, μ(c^α₃₃) = 73°. The study has revealed the sharp anisotropy of thermal deformations of these minerals, absences of the phase transitions and stability of the minerals in the chosen interval of temperatures, corresponding to conditions of their forming and alteration during the post-eruption period of the volcano activities.

Revue / Journal Title

Zapiski Vserossijskogo mineralogičeskogo obŝestva   ISSN 0869-6055 

Source / Source

2009, vol. 138, n^o1, pp. 136-143 [8 page(s) (article)]

Langue / Language

Russe

Editeur / Publisher

Nauka, Sankt-Peterburg, RUSSIE, FEDERATION DE  (1992) (Revue)

Localisation / Location

INIST-CNRS, Cote INIST : 4673, 35400018835059.0130