anorthitic

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an·or·thite

A0322200 (ăn-ôr′thīt)n. A white to gray variety of plagioclase feldspar that contains a high proportion of calcium to sodium and occurs in alkaline igneous rocks such as gabbro and anorthosite.
[From Greek an-, not; see a-1 + orthos, straight (from its oblique crystals).]
an′or·thit′ic (-thĭt′ĭk) adj.
Thesaurus
Adj.1.anorthitic - characteristic of anorthiteanorthitic - characteristic of anorthite