Crystal structure of the mineral (Na,Ca,K)(2)(Ca,Na)(4)(Mg,Fe)(5)(Mg,Fe,Ti)(5)[Si12Al4O44](F,O)(4): a triclinic representative of the amphibole familyстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:A mineral belonging to the amphibole family found at the Rothenberg paleovolcano (Eifel, Germany) was studied by single-crystal X-ray diffraction. The triclinic pseudomonoclinic unit-cell parameters are a = 5.3113(1) , b = 18.0457(3) ; c = 9.8684(2) , alpha = 90.016(2)A degrees, beta = 105.543(4)A degrees, gamma = 89.985(2)A degrees. The structure was solved by direct methods in sp. gr. P1 and refined to the R factor of 2.7% based on 6432 reflections with |F| > 3 sigma(F) taking into account twinning. The mineral with the idealized formula (Na,Ca,K)(2)(Ca,Na)(4)(Mg,Fe)(5)(Mg,Fe,Ti)(5)[Si12Al4O44](F,O)(4) has some symmetry and structural features that distinguish it from other minerals of this family.