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Wierzbicka wieczorek
Al-Fe-H-K-Mg-O-S
Al-Fe-H-K-O-S-Zn
Al-Fe-H-K-Mg-O-S-Zn
Ba-Er-O-Si
Ba-Gd-O-Si
structural properties
chalcogen
rare earth
metalloid
transitional
monoclinic
cubic
hexagonal
triclinic
trigonal