
1) Aphanitic rock 2) Dark rock 3) Rock 4) Stone 5) Volcanic rock
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https://www.crosswordclues.com/clue/aphanite

Aphanite, or aphanitic as an adjective, (from the Greek αφανης, invisible) is a name given to certain igneous rocks which are so fine-grained that their component mineral crystals are not detectable by the unaided eye (as opposed to phaneritic igneous rocks, where the minerals are visible to the unaided eye). This geological texture results ...
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http://en.wikipedia.org/wiki/Aphanite

• (n.) A very compact, dark-colored /ock, consisting of hornblende, or pyroxene, and feldspar, but neither of them in perceptible grains.
Found on
http://thinkexist.com/dictionary/meaning/aphanite/
Aph'a·nite noun [ Greek ... invisible;
'a priv. + ... to appear.]
(Min.) A very compact, dark-colored ...ock, consisting of hornblende, or pyroxene, and feldspar, but neither of them in perceptible grains.
Found on
http://www.encyclo.co.uk/webster/A/101

Aphanite is a very compact, dark-coloured rock, consisting of hornblende, or pyroxene, and feldspar, but neither of them in perceptible grains.
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http://www.probertencyclopaedia.com/browse/HA.HTM

[
n] - fine-grained homogeneous rock (such as basalt) containing minerals undetectable by the naked eye
Found on
http://www.webdictionary.co.uk/definition.php?query=aphanite

aphanite 1. An igneous rock with mineral components that are too fine to be seen with the naked eye. 2. A very compact, dense, homogeneous dark-colored rock, consisting of grains which are too fine to be seen without some form of magnification.
Found on
http://www.wordinfo.info/words/index/info/view_unit/1096/

crystalline rock in which the individual grains are so small they cannot be distinguished by the naked eye or even with the aid of a handlens.
Found on
https://www.encyclo.co.uk/local/20132
noun fine-grained homogeneous rock (such as basalt) containing minerals undetectable by the naked eye
Found on
https://www.encyclo.co.uk/local/20974

a fine-grained igneous rock having such compact texture that the constituent minerals cannot be detected with the naked eye.
Found on
https://www.infoplease.com/dictionary/aphanite
No exact match found.