ophitic

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Of or relating to ophite.
• adjective Having a texture composed of lath-shaped plagioclase feldspar crystals in a matrix of pyroxene crystals.

from The Century Dictionary.

• An epithet applied by various lithologists to a structure, especially characteristic of certain diabases and dolerites, in which the augitic constituent is separated into thin plates by interposed lath-shaped crystals of plagioclase, although the identity of the augite crystal is not lost, as is shown by the similar optic orientation of the separated portions.
• Relating to the Ophites. See Ophite.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective geology Describing any rock having crystals of feldspar interspersed with plates of augite