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Related to anorthitic: labradorite


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.
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Adj.1.anorthitic - characteristic of anorthiteanorthitic - characteristic of anorthite    
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Wellpreserved samples, with abundant fresh anorthitic plagioclases display high MgO (9-10 wt%) and low Ti[O.sub.2] (0.11-0.26 wt%) contents and strong LREE depletion (La/Yb: 0.16, Table 2, Fig.
Compositions are more anorthitic in the southern plutons and become more albitic in the northern p]utons (Fig.