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samarskite

A เกี่ยวกับ แร่ สี ดำ ที่ ประกอบด้วย ธาตุ ยูเรเนียม 

 

Webster's 1913 Dictionary

SAMARSKITE

Sa *mar "skite, a. Etym: [After Samarski, a Russian. ] (Min. )

 

Defn: A rare mineral having a velvet-black color and submetallic luster. It is a niobate of uranium, iron, and the yttrium and cerium metals.