云英岩（greisen）是一种变质岩。是由花岗岩类在高温气化热液作用下经交代蚀变形成。多呈灰白、灰绿、粉红等色，具细、中粒鳞片状变晶结构和块状构造。 主要矿物成分为白云母、石英、云母、黄玉、电气石和萤石等，其次为锡石、黑钨矿、绿柱石、石榴石、金红石等矿物组成的浅色蚀变岩石。
其中碳酸盐化、云英岩化与锡、铜、钨矿化密切相关。
Carbonatization and greisenization are closely related to sn-w mineralization.
瑶岭钨矿带钨矿成因类型有石英脉（带）型、云英岩型、蚀变花岗岩型和砂矿床。
Tungsten mineralization types in Yaoling zone are divided into quartz vein, greisen, altered granite and placer.
燕山构造旋回控制的晚期岩浆，随着构造演化产生云英岩化、石榴子石化等岩浆自交代而锡铌钽矿物结晶富集成矿；
The Yanshanian magmas in late phases, gave rise to sericitization and garnetization, and then Sn, Nb and Ta were enriched due to magmatic-authometasomatism.
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