biotite

3—胶东群黑云变粒岩和白云母片岩；

3—Biotite leptynite and muscovite schist of Jiaodong Group;

The main gold-carrying minerals are pyrite,chalcopyrite and telluride.The best gold-carrying rock is the biotite-albit schist.

主要的载金矿物有黄铜矿、黄铁矿、叶碲铋矿，含金最好的岩石类型只云母钠长片岩。

The Sn granites are characterized by biotite and titanite as Sn-bearing minerals, which suffured hydrothermal alteration, leading to tin leaching and subsequent crystallization of cassiterite.

前者以黑云母、榍石典型含锡矿物，它们在流体富集阶段，经热液蚀变作用，导致锡的淋滤和结晶富集作用；

The ore minerals are mainly anatase, subordinately rutile and ilmenite (±hematite), while the nonmetallic minerals are chiefly quartz with a certain amount of anthophyllite and biotite (±garnet).

矿石矿物主要矿，次有金红石和铁矿(±赤铁矿)，脉石矿物以石英主，含一定量的直闪石和黑云母(±石榴子石)。

There is an obvious rock zonation from the middle to bothsides of the structural shatter zone, generally from marialite orebody through diopside-felsite,biotite-albitite to the host Proterozoic rocks.

构造破碎带的岩石具有明显的对称分带：破碎带的中心钠柱石矿体，向两侧依次榍石透辉石长英岩带、黑云母钠长岩带，并逐渐过渡围岩。钠柱石矿的成因类型沿构造破碎带产出的热液交代脉型。