Thermal expansion of new arsenate minerals, bradaczekite, NaCu4(AsO4)3, and urusovite, Cu(AsAlO5)

Autor:	Sergey V. Krivovichev, D. S. Rybin, Lidiya P. Vergasova, Stanislav K. Filatov
Rok vydání:	2009
Předmět:	geography geography.geographical_feature_category Fissure Arsenate Mineralogy Geology Atmospheric temperature range Thermal expansion chemistry.chemical_compound medicine.anatomical_structure chemistry Volcano Geochemistry and Petrology Thermal medicine Economic Geology Thermal analysis Anisotropy
Zdroj:	Geology of Ore Deposits. 51:827-832
ISSN:	1555-6476 1075-7015
DOI:	10.1134/s1075701509080169
Popis:	Thermal behavior of two new exhalation copper-bearing minerals, bradaczekite and urusovite, from the Great Tolbachik Fissure Eruption (1975–1976, Kamchatka Peninsula, Russia) has been studied by X-ray thermal analysis within the range 20–700°C in air. The following major values of the thermal expansion tensor have been calculated for urusovite: α11 = 10, α22 = αb = 7, α33 = 4, αV = 21 × 10−6°C−1, μ = c∧α33 = 49° and bradaczekite: α11aver = 23, α22 = 8, α33aver = 6 × 10−6°C−1, μ(c∧α33) = 73°. The sharp anisotropy of thermal deformations of these minerals, absences of phase transitions, and stability of the minerals in the selected temperature range corresponding to conditions of their formation and alteration during the posteruption period of the volcanic activity are established.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::197aaae6206be01a70754dd6380f1919 https://doi.org/10.1134/s1075701509080169 Zobrazit plný text záznamu Full text from SpringerLink