Manasi green jade belongs to tremolite jade, it is a kind of ancient jade. The jade can be found in placer and primary deposit, it was exploited in Qing Dynasty. The primary deposit was serpentinized pyroxene peridotite derived from ultramafic rocks, it was located in contact belt of the rock body and country rock (volcanic rock or pyroclasts), and formed by matasomatism. The jade is called green jade since its colour is green.