magnesian

1.Thus, the boron-bearing rock system and the magnesian rocks are the foundation of the borate deposits, whereas regional metamorphism and migmatitization and tectonism are the necessary conditions.

含硼岩系、质容矿岩石是硼矿形成物质基础，区域变质及混合岩作、构造活动是硼矿形成必要条件。