biotite

3—胶东群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.

主金矿物有黄铜矿、黄铁矿、叶碲铋矿，含金最好岩石类型为只云母钠长片岩。

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.

前云母、榍石为典型含锡矿物，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).

矿石矿物主为锐钛矿，次有金红石和钛铁矿(±赤铁矿)，脉石矿物石英为主，含一定量直闪石和云母(±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.

构造破碎带岩石具有明显对称分带：破碎带中心为钠柱石矿体，向两侧依次为榍石透辉石长英岩带、云母钠长岩带，并逐渐过渡为围岩。钠柱石矿成因类型为沿构造破碎带产出热液交代脉型。