名 称：强蚀变超基性岩

矿物成分：主要为蛇纹石、橄榄石、绿帘石、绿泥石、滑石、硅孔雀石、铁矿物等。

成因类型：地幔岩，赋存于西拉木伦河蛇绿构造混杂岩带中。是晚古生代大洋俯冲消减闭合的构造残片，是西伯利亚板块与华北板块构造逢合带的主要物质组成。原岩超基性岩（橄榄岩）由洋壳扩张、地幔超基性熔浆沿洋中脊上侵至洋壳中形成。后经洋壳俯冲闭合、构造改造、变质、风化等一系列地质作用，才形成今天的岩石面貌。

主要用途：是铬铁矿、铜钴镍矿等的含矿母岩，也是蛇纹石等的原石，品质好的可成为玉石；是洋壳的鉴定证据之一，构造意义非常重要。

形成时代：早二叠世

采集地点：内蒙古林西县哈吗吐乡小杏树洼村

Name：Serpentinized peridotite

Mineralogy：Mostly serpentine, olivene, epidote, chlorite, talc, silicon malachite and iron oxides.

Genesis：Mantle-derived rock，hosted in the Xialamulun River ophiolite mélange, which was relict slab of the late Paleozoic subducted ocean floor after the closure of the ocean, which was the products of the suture zone between the Siberian Plate and North China Plate. The primary ultrabasic rocks (peridotite) were created via ocean floor spreading during which the mantle derived ultrabasic magma emplaced along the ocean ridge. These rock experienced subsequent ocean closure, tectonic modification, metamorphism and weathering, giving rise to the present outcrops.

Usage：Host to chromite, copper, cobalt, and nickel, also source for serpentine. High quality serpentinite could be rated as jade. Evidence for identification of ocean floor, of significance for tectonic research.

Age：Early Permian

Sample site：Xiaoxingshuwa, Hamatu, Xilin, Inner Mongolia.