In geology terms the difference between igneous and mesostasis
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 mesostasis is the very last state (or material formed) in the formation of an igneous rock.
As an adjective igneous
is pertaining to, having the nature of fire; containing fire; resembling fire; as, an igneous appearance.
As a noun mesostasis is
the very last state (or material formed) in the formation of an igneous rock.
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
mesostasis
English
Noun
(geology) The very last state (or material formed) in the formation of an igneous rock