ophitic
adjective
ophit·ic ä-ˈfi-tik 
ō-
: having or being a rock fabric in which lath-shaped plagioclase crystals are enclosed in later formed augite
Word History
Etymology
ophite "rock with snake-like markings, serpentine" (borrowed from Latin ophītēs, borrowed from Greek ophī́tēs [líthos] "snake-like [stone]," from óphis "snake" + -itēs -ite entry 1) + -ic entry 1 — more at ophidian
First Known Use
1870, in the meaning defined above