Associated minerals are mainly magnetite and ilmenite, subordinately pyrite and rarely chalcopyrite.是什么意思？

Associated minerals are mainly magnetite and ilmenite, subordinately pyrite and rarely chalcopyrite.

主要伴生矿物为磁铁矿、钛铁矿, 少量黄铁矿和微量黄铜矿.

associated

vt. 合伙，合营，联合，结合，联想；vi. 联系(associate的过去式和过去分词)，联盟，陪伴；n. 合伙人，伴侣，同志，联想物，附随物，会员集体；adj. （用于联合企业的名称）联合的，有关联的，联合的；

例句
Genetic abnormalities are more often associated with faults in paternal DNA than in maternal DNA.
相对于母本DNA,基因畸变往往更多地与父本DNA上的缺陷相关。

minerals

n. 矿物( mineral的名词复数 )，矿石，矿物质，汽水；

例句
Forster established the essentiality of minerals as accessory food factors required for maintaining life.
福斯特证实了矿物质作为辅助食物因子在维持生命方面的重要性。

are

vi. （用于第二人称单复数现在时，第一、三人称复数现在时）是；n. 公亩（等于100平方米）；

例句
We are scared to abandon ourselves to our feelings in case we seem weak or out of control.
我们不敢放纵自己的情感，以免显得太过软弱或缺乏自制。

mainly

adv. 大部分地，主要地，基本上；

例句
Thousands of people, mainly Zulus, assembled in a stadium in Thokoza...
数以千计的人，主要是祖鲁族人，聚集在托考查的一个体育场里。

magnetite

n. 磁铁矿；

例句
Associated minerals are mainly magnetite and ilmenite, subordinately pyrite and rarely chalcopyrite.
主要伴生矿物为磁铁矿、钛铁矿, 少量黄铁矿和微量黄铜矿.

and

conj. 和，与，而且，于是，然后，因此；

例句
I spend a lot on expensive jewelry and clothing...
我花很多钱购买昂贵的首饰和衣服。

ilmenite

n. 钛铁矿；

例句
The reaction kinetics leading ilmenite directly by acid was investigated.
研究了盐酸直接浸取钛铁矿的浸取动力学.

pyrite

n. <矿>黄铁矿；

例句
Associated minerals are mainly magnetite and ilmenite, subordinately pyrite and rarely chalcopyrite.
主要伴生矿物为磁铁矿、钛铁矿, 少量黄铁矿和微量黄铜矿.

rarely

adv. 很少地，罕有地，极精彩地，珍奇地，绝佳地；

例句
Journalists are rarely admitted to the region.
新闻记者很少获准进入该地区。

chalcopyrite

n. 黄铜矿；

例句
While chalcopyrite adsorbs gold most weakly with its adsorption capacity 9 % only.
吸附性相对最弱的是黄铜矿,吸附量仅为9%.