olivenite

o·liv·en·ite

[oh-liv-uh-nahyt, ol-uh-vuh-]
noun
a mineral, basic copper arsenate, Cu 4 As 2 O 8 (OH) 2 , occurring in crystals and in masses, usually olive-green in color.

Origin:
1810–20; < German Oliven(erz) olive (ore) + -ite1

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World English Dictionary
olivenite (ɒˈlɪvɪˌnaɪt) [Click for IPA pronunciation guide]
 
n
a green to black rare secondary mineral consisting of hydrated basic copper arsenate in orthorhombic crystalline form. Formula: Cu2(AsO4)(OH)
 
[C19: from German Oliven(erz) olive (ore) + -ite1]

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Olivenite is always a great word to know.
So is bezoar. 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.
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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