roscoelite

  

ros·coe·lite

[ros-koh-lahyt]
noun Mineralogy.
a brown variety of muscovite in which some aluminum is replaced by vanadium.
Origin:
1875–80; named after Sir Henry Roscoe (1833–1915), English chemist; see -lite

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Roscoelite is always a great word to know.
So is ninnyhammer. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a fool or simpleton; ninny.
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