adjective
- of, relating to, or containing anorthosite or anorthite (a calcium aluminum silicate mineral)
Usage: geology; mineralogy
Examples
- The anorthitic rocks found in the lunar highlands are among the oldest materials on the Moon.
- Anorthitic plagioclase feldspar is a key component of many igneous rocks.
- Geologists studied the anorthitic composition of the meteorite sample.
- The anorthitic layer in the Earth's crust contributes to crustal density variations.