aphanite

aphanite

[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

aphanitic [af-uh-nit-ik] , adjective
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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]

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