ber·trand·ite

[bur-truhn-dahyt]
noun
a mineral, hydrous beryllium silicate, Be 4 Si 2 O 7 (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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Bertrandite is always a great word to know.
So is callithumpian. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
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Example sentences
Beryllium is a metal that is found in nature, especially in beryl and
  bertrandite rock.
Only two beryllium minerals are of current economic importance, beryl and
  bertrandite.
Beryllium is a naturally occurring metal found in beryl and bertrandite ores.
Two kinds of mineral rocks, bertrandite and beryl, are mined commercially for
  the recovery of beryllium.
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