Abstract
AbstractIn single crystals of scapolite from two different localities, three paramagnetic centres are detected by electron paramagnetic resonance (EPR): 1. One isotropic singlet with giso = 2.005; 2. One triclinic singlet with g‖ = 2.005 ± 0.001 and g⟂= 2.009; 3. One triclinic sextet with g‖= 2.005 ± 0.001, g⟂ = 2.011; A‖ = 85.4 × 10−4 cm−4, A⟂ = 85.3 × 10−4 cm−1.Centres 1 and 2 can be attributed to colour centres as they are bleached after annealing.Centre 3 can be due to Mn2+ (only the central Ms = ± 1/2 transition is observable) most likely substituting for Ca2+ The site symmetry must be triclinic but due to Al, Si disorder and mixed Na, Ca composition the different components from magnetically non‐equivalent sites are averaged out for many orientations.
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