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   <subfield code="a">Potassium-fluor-richterite, a new amphibole from San Vito, Monte Somma, Campania, Italy</subfield>
   <subfield code="h">[Elektronische Daten]</subfield>
   <subfield code="c">[Giancarlo Ventura, Gian Parodi, Adriana Maras, A. Mottana]</subfield>
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   <subfield code="a">Potassium-fluor-nchterite, un nuovo anfibolo da San Vito, Monte Somma, Campania, Italia</subfield>
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   <subfield code="a">Potassium-fluor-richterite occurs as euhedral crystals, light-grey in colour, in a skarn ejectum from a pyroclastic deposit near S. Vito, Monte Somma, Naples. It is associated with diopside and calcite. The strongest X-ray diffraction lines are (d- spacing in Å): 3.166, 8.49, 3.288, 2.831, 1.918 and 1.633. The cell parameters (in Å, space groupC2/m) are:a = 9.978 (1);b = 17.991(2);c = 5.269 (1); ß(°) = 104.90 (2);V = 914.2 (3). Potassium-fluor-richterite is biaxial negative with (± 0.004) nX = 1.613; nY = 1.623; nZ = 1.630. The crystal-chemical formula is: (K0.67Na0.34) (Ca1.09Na0.91) (Mg40.976Fe0.017Mn0.002) (Si7.94Al0.04Ti0.007) O22 (F1.35OH0.65). The FTIR spectrum in the OH-stretching region is discussed.</subfield>
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