8.1.6.4 Sodalite, cancrinite, and leifite groups of silicates 8.1.6.4.1 General 8.1.6.4.2 Sodalite group of silicates 8.1.6.4.2.1 Crystal structures 8.1.6.4.2.2 Magnetic properties 8.1.6.4.2.3 Nuclear gamma resonance (NGR) data 8.1.6.4.2.4 Electron paramagnetic resonance (EPR) data 8.1.6.4.2...