HAL will be down for maintenance from Friday, June 10 at 4pm through Monday, June 13 at 9am. More information
Skip to Main content Skip to Navigation
Journal articles

Composite twins of lM mica: derivation and identification.

Abstract : 1"M is the simplest and one of the most common mica polytypes. Because of the special cell dimensions, twinning by reticular pseudo-merohedry is frequently observed. The possible orientations of the individuals in the twin are approximately the same as the possible orientations of layers in polytypes. Because of the presence of a pseudo-hexagonal twin lattice, five pairs of twin laws are possible and they give rise to five pairs of corresponding twins. Thirty-one composite twins can be enumerated, which however give rise to ten different diffraction patterns. In the twin lattice there are nine geometrically independent rows parallel to c*, defining a minimal rhombus in reciprocal space, which allows us to identify the ten independent patterns. A larger unit of translation, called tessellation rhombus, can be built on it; by tessellation of this unit all the reciprocal space can be covered.
Complete list of metadata

Contributor : Massimo Nespolo Connect in order to contact the contributor
Submitted on : Thursday, February 22, 2018 - 5:58:30 PM
Last modification on : Monday, February 7, 2022 - 4:06:04 PM
Long-term archiving on: : Wednesday, May 23, 2018 - 3:14:11 PM


Publisher files allowed on an open archive




Massimo Nespolo, Hiroshi Takeda, Giovanni Ferraris, Toshihiro Kogure. Composite twins of lM mica: derivation and identification.. Mineralogical Journal, 1997, 19 (4), pp.173 - 186. ⟨10.2465/minerj.19.173⟩. ⟨hal-01715531⟩



Record views


Files downloads