Fig. 3: Wadsleyite with poirierite lamellae in the Miami chondrite.
From: Poirierite, a dense metastable polymorph of magnesium iron silicate in shocked meteorites
a Bright-field transmission electron microscope (TEM) image of a wadsleyite grain with (010) stacking faults. b and c Selected-area electron diffraction patterns obtained from portions (b and c) in (a). Asterisks show direct spots. Weak diffraction spots appear only within the portion with staking faults. Spots in the dotted circles are from poirierite caused by dynamical diffraction. d Bright-field TEM image of a wadsleyite grain, and (e) its selected-area electron diffraction pattern showing topotaxy with poirierite: aWds//aPoi, bWds//bPoi, cWds//cPoi.
