辉石岩是一种火成岩,主要由辉石组成,其辉石含量为90%-100%,深颜色,粒状结构,只含有少量的橄榄石、角闪石、黑云母、铬铁矿或磁铁矿、钛铁矿等。辉石岩经热液蚀变后可以形成纤维状蛇纹石(或绢石),根据其含有不同的辉石,可分为:
- 斜方辉石岩;
- 单斜辉石岩;
- 二辉岩;以上两种辉石都存在;
- 黑云母辉石岩;
- 角闪石辉石岩。
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