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

三、铁硅酸盐矿物:有橄榄石、黑榴石、十字石、黑柱石、普通辉石等。

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、三维视图和内插放大方式显示图像，解决了低倍X射线像失真问题，了辉石的隐环带现象。