二长岩(monzonite) 是正长岩向闪长岩过渡或向辉长岩过渡的种属。斜长石和钾长石含量接近相等，二者均>30%，具典型二长结构。与正长岩相比，斜长石偏基性，多为中长石至拉长石。据暗色矿物种类，细分为黑云母二长岩、角闪石二长岩和辉石二长岩。二长岩（Monzonite） 为淡玫瑰色、灰色全晶质的中性侵入岩。英文名monzonite来自阿尔卑斯山Tyrol的一个地名Monzone，首先于1895年由W·C·Brogger加以描述。
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水晶屯金矿床位于张宣幔枝构造轴部，水泉沟—大南山碱性角闪二长岩杂岩体的西缘。
Shuijingtun gold deposit is located in the central axis of the Zhanjiakou-Xuanhua mantle branch and in the west of alkaline hornblende monzonite in the area of Shuiquangou-Dananshan in Zhangjiakou.
辉石二长岩形成于高温、超浅成的环境下，贫水、粘度较高的岩浆有利于火山穹窿的形成。
Augite monzonite crystallized at high-temperature and over-hypabyssal conditions. The water-deficient, highly viscous magma was favourable to the formation of the volcanic dome.
来自休斯顿的消息：在实验室里，月亮石看起来平淡无奇——深灰色玄武岩，白色斜长岩以及二者的晶体混合物。
HOUSTON - in the lab, the Moon rocks look nondescript - dark gray basalt, a whitish mineral called anorthosite and mixtures of the two with crystals thrown in.
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