Shock-Transformed Olivine Grains to Ringwoodite in the Meteorite of NWA 5011

Introduction: The ringwoodite (γ-phase olivine) was firstly identified in Tenham meteorite in 1969. During the last 40 years, ringwoodite has been determined in many other meteorites especially in L-type chondrites. Ringwoodite may coexist with wadsleyite (β-phase olivine) which has a pale fawn colouration [1-4]. The ringwoodite formation have take place in shock-induced melt veins, which contains the matrix of mixtured glassy and other high pressure mineral polimorphs. The colour of ringwoodite varies between the meteorites, between different ringwoodite bearing aggregates, and even in one single aggregate [1]. We provide our optical observations about the ringwoodite aggregates in the shock-induced melt veins of NWA 5011 meteorite, and about the micro-Raman spectroscopy identification.