It is a product of volcanic rocks of the mesozoic era over-saturated with silica and rich in potash. it can be compared with geode natrolite that producedin alkaline basalt series of the cenozoic era.
它是中生代硅酸过饱和并富钾质的火山岩系的产物，其意义可与产于新生代碱性玄武岩系中的晶洞钠沸石对比。
2
The alkaline rich intrusive rocks outcropped in the south margin of North China landmass (Henan section) concentrically distributing Lushi-Queshan belt.
华北陆块南缘(河南段)出露的富碱侵入岩类集中分布于卢氏-确山一线。
3
Granitic rocks mainly consist of quartz, plagioclase and alkaline feldspar and hence have lower densities.