斜长岩，一种由90%或更多的基性斜长石组成的深成岩。深色矿物有各种辉石、橄榄石和角闪石等。斜长岩在大陆和大洋地区都有分布，从早太古代到新生代都有产生，但在前寒武纪地区形成巨大的块体。
n. anorthosite
misc. plagioclasite
斜长岩组中的矿层仅断续出露。
Seams in the anorthosite series are only intermittently exposed.
一种斜长岩长石的变体，发现于火成岩中，某些样本中含有丰富绚烂的颜色。
A variety of plagioclase feldspar found in igneous rocks and characterized by brilliant colors in some specimens.
河北承德大庙黑山铁矿床位于大庙斜长岩体南部边缘，红石砬—大庙深断裂附近北侧。
The Damiao iron deposit is located at the southern margin of the Damiao plagioclase rock body and northern side of the southern edge of Hongshila-Damiao deep fault.
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