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Aphanite

[af-uh-nahyt]

aph·a·nite

[af-uh-nahyt]
noun Petrography.
a fine-grained igneous rock having such compact texture that the constituent minerals cannot be detected with the naked eye.

Origin:
1860–65; < Greek aphan(ḗs) unseen, hidden, invisible (a- a-6 + phanēs, adj. derivative of phaínein to bring to light, disclose) + -ite1

aph·a·nit·ic [af-uh-nit-ik] , adjective
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Aphanite is always a great word to know.
So is quincunx. 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 calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
Collins
World English Dictionary
aphanite (ˈæfəˌnaɪt)
 
n
any fine-grained rock, such as a basalt, containing minerals that cannot be distinguished with the naked eye
 
[C19: from Greek aphanēs invisible]

Collins English Dictionary - Complete & Unabridged 10th Edition
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