biotite

3—胶东群黑云变粒和白云母片；

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.

主要载金物有黄铜、黄铁、叶，含金最好类型为只云母钠长片。

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、榍为典型含锡物，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).

物主要为锐钛，次有金红和钛铁(±赤铁)，脉物以英为主，含一定量直闪和黑云母(±榴子)。

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.

构造破碎带具有明显对称分带：破碎带中心为钠柱体，向两侧依次为榍透辉长英带、黑云母钠长带，并逐渐过渡为围。钠柱成因类型为沿构造破碎带产出热液交代脉型。