bertrandite

[bur-truhn-dahyt]

ber·trand·ite

[bur-truhn-dahyt]
noun
a mineral, hydrous beryllium silicate, Be4Si2O7(OH)2, colorless or pale yellow, with a vitreous luster, occurring as tabular or prismatic crystals in pegmatites and hydrothermal veins.

Origin:
1885–90; < French, after E. Bertrand, French mineralogist, who first described it; see -ite1
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Bertrandite is always a great word to know.
So is gobo. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
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