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词汇 allanite
释义

Definition of allanite in English:

allanite

noun ˈalənʌɪt
mass noun

  • A brownish-black mineral of the epidote group, consisting of a silicate of rare earth metals, aluminium, and iron.

    褐帘石

    Example sentencesExamples
    • Up to 20% of allanite's weight could be composed of these rare earth elements, making allanite a potentially valuable ore.
    • In his 1885 report, Eakins described allanite and gadolinite from the area.
    • Large titanite euhedra are abundant along with apatite and zircon, with allanite and epidote less so.
    • The first account of allanite from Wales was that by Thomas (1909) and Fearnsides (1910), concerning the discovery, in the Ffestiniog Granite Quarry, of an 'unknown and very interesting mineral' in 1908, which was identified a year later as allanite.
    • Gadolinite and allanite intergrowths form walnut-shaped vitreous black masses and nodules to 5 cm across.

Origin

Early 19th century: named after Thomas Allan (1777–1833), Scottish mineralogist, + -ite1.
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