The crystal structure of Hiortdahlite II [triclinic P1, a = 11.012(6), b = 10.342(3), c = 7.359 (3) Å, a = 89.92(2)°, β = 109.21(5)°, y = 90.06(3)°], was determined and refined using 1793 reflections to R1 = 0.069 and R2 = 0.066. The results of the structural study indicated that hiortdahlite II presents the modules which characterize the whole family of minerals related to cuspidine and låvenite, namely "octahedral walls", four columns large and running along c, and Si2O7 groups. In hiortdahlite II the modules are connected according to the same topology realized in låvenite. The peculiar octahedral cations distribution, which is determined and discussed in this work, is responsible for the descent in symmetry to P1
THE CRYSTAL-STRUCTURE OF HIORTDAHLITE-II
MERLINO, STEFANO;PERCHIAZZI, NATALE
1987-01-01
Abstract
The crystal structure of Hiortdahlite II [triclinic P1, a = 11.012(6), b = 10.342(3), c = 7.359 (3) Å, a = 89.92(2)°, β = 109.21(5)°, y = 90.06(3)°], was determined and refined using 1793 reflections to R1 = 0.069 and R2 = 0.066. The results of the structural study indicated that hiortdahlite II presents the modules which characterize the whole family of minerals related to cuspidine and låvenite, namely "octahedral walls", four columns large and running along c, and Si2O7 groups. In hiortdahlite II the modules are connected according to the same topology realized in låvenite. The peculiar octahedral cations distribution, which is determined and discussed in this work, is responsible for the descent in symmetry to P1I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
