fergusonite

Noun

Meaning

A mineral of a brownish black color, essentially a tantalo-niobate of yttrium, erbium, and cerium; -- so called after Robert Ferguson.

Source: Webster's dictionary

thorite uraninite gadolinite niobite sphalerite euxenite cerite allanite pyrochlore lanthanite orthite bastnasite ilmenorutile kainosite keilhauite

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mineral