Fig. 7

Some typical examples of diffractograms of the samples: a HFO1; b HB2; c HFG1; d HG1; e HM1; f HT3; g HTR1. (Q: quartz; C: calcite; A: albite; B: biotite; O: orthoclase; P: polylithionite; M: muscovite; S: sepiolite; H: haematite; Y: yeelimite; K: kaolinite; D: dickite)