在西藏雅鲁藏布江蛇绿岩带的东部,距拉萨市200 km 的罗布莎蛇绿岩的豆荚状铬铁岩中,发现方铁矿和自然铁。而且以自然铁为核心并包裹于方铁矿中,两者形成圆球形态。自然铁的空间群为 Fm3m,晶胞参数α=0.28663 nm。方铁矿空间群为 Fm3m,晶胞参数α=0.43070 nm。根据有关实验资料推断,高压矿物方铁矿和自然铁来自下地幔,并且可能为核幔边界化学反应生成物。 In the eastern part of the Yarlung Zangbo ophiolite belt in Tibet, from the podoliths of the Luobusa ophiolite, 200 km from Lhasa, pearlite and natural iron are found. And to the core of natural iron and wrapped in iron ore, the two form a spherical form. Natural iron space group Fm3m, unit cell parameters α = 0.28663 nm. The iron ore space group is Fm3m, and the unit cell parameter α = 0.43070 nm. Based on the experimental data, it is concluded that the high-pressure mineral iron ore and natural iron come from the lower mantle and may be chemical reaction products at the boundary of the mantle.