Indeed , two iridium layers have been found in some places .

确实，有些地方发现了有两个铱层。

Platinum , iridium and the rest are expensive precisely because they are rare .

正因为稀有，铂、铱等矿物才价格不菲。

Analyzing the fossils at this small site , they counted 52 distinct species just below the iridium layer .

他们分析了这个小地区的化石层，一共计算了在铱层下面的52个不同物种。

Further examination revealed a crater rich in shocked quartz and iridium , minerals that are commonly found at impact sites .

进一步的调查显示火山口富含冲击石英和铱，在撞击地点一般都可发现这两种矿石。

Iridium can also be found in crystals in computer memory devices , deep-water pipes , x-ray telescopes and the equipment that makes rayon fibers .

在电脑内存设备护面，深水导管，x射线望远镜和制造粘胶纤维的设备中，也都能找到铱的身影。