annabergite

an·na·berg·ite

[an-uh-bur-gahyt]
noun
a mineral, hydrous nickel arsenate, Ni 3 As 2 O 8 ⋅8H 2 O, occurring in apple-green masses and isomorphous with erythrite.

Origin:
named after Annaberg, a town in E Germany where first found; see -ite1

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annabergite (ˈænəˌbɜːɡaɪt) [Click for IPA pronunciation guide]
 
n
Also called: nickel bloom a rare green secondary mineral consisting of hydrated nickel arsenate in monoclinic crystalline form. Formula: Ni3(AsO4)2.8H2O
 
[C19: named after Annaberg in Saxony, where it was discovered; see -ite1]

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Annabergite is always a great word to know.
So is ninnyhammer. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a fool or simpleton; ninny.
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