变质结构 meaning in English

deteriorated structure
metamorphic texture

The textures of myanmar jadeitites are classified into three major types according to the forming stages and the petro - graphic features : primary texture , deformed - metamorphosed texture and post - filled texture , and their gemmological implications are discussed
依据其形成阶段及岩相学特征将缅甸硬玉岩的结构首次分为三大类：原生结构、变形变质结构及后生充填结构。