Contribution
Katayamalite and baratovite are structurally identical
Baur, Werner H.; Kassner, Dethard
European Journal of Mineralogy Volume 4 Number 4 (1992), p. 839 - 842
7 références bibliographiques
publié: Aug 5, 1992
manuscrit accepté: Apr 6, 1992
manuscrit reçu: Nov 25, 1991
DOI: 10.1127/ejm/4/4/0839
Abstract
Abstract An investigation of the crystal structure of the mineral katayamalite, KLi3Ca7Ti2[Si6O18]2(OH,F)2 , shows that it is best described as monoclinic in space group C2/c, and not as centrosymmetrically triclinic as originally proposed. Moreover, a comparison of the crystal structures of katayamalite and baratovite, KLi3Ca7(Ti,Zr)2[Si6O18]2(OH,F)2, shows them to be identical within experimental error. The only difference between the two minerals is the slightly different chemical composition. Therefore katayamalite and baratovite are structurally identical minerals.
Mots-clefs
Katayamalite • baratovite • symmetry • crystal structure • ring silicate