III.silicate mineral contain iron, include olive stone, black column stone, common picrite etc.

三、含铁硅酸盐矿物:有榄、榴、十字、、普通辉等。

There is one kind of picrite in Manxin of Menglian of Southwestern Yunnan that was considered as vein of picrite porphyrite by predecessors.

产于滇西南孟连曼信的苦岩，前人定为苦玢岩岩脉。

X-ray images were formed and shown in colors or in 3 dimensions, and have no distortion at low magnification.Hidden zonate phenomena of a picrite were found.

用伪彩色、三和内插放大方式显示像，解决了低倍X射线像失真问题，观察到了辉的隐环带现象。