In geology terms the difference between igneous and diabase
is that igneous is resulting from, or produced by, the action of great heat; with rocks, it could also mean formed from lava/magma; as, granite and basalt are igneous rocks while diabase is a fine-grained igneous rock composed mostly of pyroxene and feldspar.
As an adjective igneous
is pertaining to, having the nature of fire; containing fire; resembling fire; as, an igneous appearance.
As a noun diabase is
a fine-grained igneous rock composed mostly of pyroxene and feldspar.
igneous
English
Adjective
(
en adjective)
Pertaining to, having the nature of fire; containing fire; resembling fire; as, an igneous appearance
(geology) Resulting from, or produced by, the action of great heat; with rocks, it could also mean formed from lava/magma; as, granite and basalt are igneous rocks
diabase
English
Noun
(
wikipedia diabase)
(
-)
(geology) A fine-grained igneous rock composed mostly of pyroxene and feldspar
Synonyms
* dolerite