Table 1 Crystal-chemical formulae, obtained by combining electron–microprobe, XRD, and Mössbauer analyses, and space-group symmetry at room temperature for the studied samples; elements with <0.005 atoms per formula unit (apfu) were neglected.

From: Atomistic insight into lithospheric conductivity revealed by phonon–electron excitations in hydrous iron-bearing silicates

Sample

AB[M(4)]2C[M(1)2M(2)2M(3)]T8O22W2

Symmetry

A85

A□M(4)(Fe2+1.96Mg0.02Ca0.01Na0.01) [M(1)(Fe2+1.84Mg0.16)M(2)(Fe2+1.76Mg0.21Al0.03)M(3)(Fe2+0.94Mg0.06)] T(Si7.97Al0.03)O22W[(OH)1.99F0.01]

C2/m

A86

A□M(4)(Fe2+1.87Ca0.10Mn0.01Na0.02) [M(1)(Fe2+1.48Mg0.52)M(2)(Fe2+1.17Mg0.79Al0.04)M(2)(Fe2+0.78Mg0.22)] T(Si7.97Al0.03)O22W[(OH)1.98F0.02]

C2/m

  1. No traces of Fe3+ were detected by Mössbauer spectroscopy in either sample.
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