是向花岗岩过渡的种属，石英含量>5%。石英含量为5%-20%，也可分为黑云石英正长岩、角闪石英正长岩及辉石石英正长岩。若岩石中含碱性暗色矿物(霓石、棕闪石)，称为英碱正长岩(nordmarkite)。
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含铁橄榄石石英正长岩，代表了岩浆分离结晶初期还原条件下，太古代母岩派生的初始岩浆组成。
Fayalite-bearing quartz syenite could represent the early fractional stage initial granitic magma derived from archean protolith in a deeper and reductive environment.
岩性上自早到晚由辉长岩、辉石正长岩、（石英）正长岩和正长花岗岩等四个岩石单元构成。
It is composed of four rock units, they are gabbro, pyroxene syenite, (quartz) syenite and syenogranite from early to late.
冶父山岩体主体岩性为石英正长斑岩。
The Yefushan rock mass is mainly composed of quartz syenite porphyry.
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