[en] Wollastonite-1A from Băița Bihor occurs in distal calcic skarns developed in the contact zone of a mainly granodioritic batholith, of Upper Cretaceous age, with Mesozoic limestones and dolostones. Wollastonite generally occurs in the inner part of metasomatic columns, in monomineralic skarns or associated with grossular and molybdenite-2H as ore mineral. The physical properties (i.e., refraction indices α = 1.616, β = 1.629, and γ = 1.631, 2Vα = 39° and density Dm = 2.922(3) g/cm 3) are typical for a term close to the stoichiometry, which is confirmed by the chemical analysis. The chemical structural formula of the analyzed wollastonite-1A is (Ca1.000Mg0.002Mn0.001Fe0.001)(Al0.004Ti0.001Si0.994)O3, which closely approximates the ideal CaSiO3. The Gladstone-Dale compatibility indices account for an excellent agreement between physical and chemical data. The mineral can be satisfactorily refined as triclinic, space group P̅ 1, with R1 = 0.0678 and cell parameters a = 7.9233(3) Å, b = 7.3203(3) Å, c = 7.0651(3) Å, α = 90.053(3)°, β = 95.208(3)°, γ = 103.384(3)°. Both the IR and Raman spectra principally reveal bands related to vibrations of bridged and non-bridged oxygens pertaining to SiO4 structural tetrahedra. At Băița Bihor, wollastonite-1A is part of the prograde paragenesis, marked by a peak temperature of 550-600 °C.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Marincea, Stefan ; Université de Liège - ULiège > Département de géologie > Minéralogie et cristallochimie ; Department INI, Geological Institute of Romania, Bucharest, Romania
Dumitraş, Delia-Georgeta; Department INI, Geological Institute of Romania, Bucharest, Romania
Hatert, Frédéric ; Université de Liège - ULiège > Département de géologie > Minéralogie et cristallochimie
Sava Ghineț, Cristina; Department INI, Geological Institute of Romania, Bucharest, Romania
Dincă, George; Department INI, Geological Institute of Romania, Bucharest, Romania ; Research Center for Ecological Services (CESEC), University of Bucharest, Bucharest, Romania
Iancu, Aurora-Măruța; Department INI, Geological Institute of Romania, Bucharest, Romania
Depret, Martin ; Université de Liège - ULiège > Département de géologie > Minéralogie et cristallochimie
Language :
English
Title :
Crystal Structure vs. Vibrational Behavior of Wollastonite-1A from Băița Bihor, Bihor Mountains, Romania
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