sa·mar·skite /səˈmɑrˌskaɪt, ˈsæmɚ/
鈮釔礦
Sa·mar·skite a. Min. A rare mineral having a velvet-black color and submetallic luster. It is a niobate of uranium, iron, and the yttrium and cerium metals.
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samarskite
n : a complex black mineral occuring in pegmatites