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Related to anorthite: 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.


(Minerals) a white to greyish-white or reddish-white mineral of the feldspar group and plagioclase series, found chiefly in igneous rocks and more rarely in metamorphic rocks. It is used in the manufacture of glass and ceramics. Composition: calcium aluminium silicate. Formula: CaAl2Si2O8. Crystal structure: triclinic
[C19: from an- + ortho- + -ite1]
anorthitic adj


(ænˈɔr θaɪt)

a white or gray feldspar mineral, CaAl2Si2O8, calcic plagioclase.
[1823; an-1 + Greek orth(ós) straight + -ite1]
an`or•thit′ic (-ˈθɪt ɪk) adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.anorthite - rare plagioclastic feldspar occurring in many igneous rocksanorthite - rare plagioclastic feldspar occurring in many igneous rocks
oligoclase, plagioclase - any of a series of triclinic feldspars that form rocks
References in periodicals archive ?
3--Halite + Antigorite + Anorthite + Magnesite + Montmorillonite NaCl + [Mg.
The phase composition of the samples of ceramic tiles is represented mainly by quartz, anorthite and a small amount of hematite and almost the same for all investigated compositions.
One of the Chandrayaan 1's findings, reported in September 2009, was a confirmation of the mineral anorthite, rich in calcium plagioclase.
These soils can be described as of low OM content, with a mineralogy dominated by highly crystalline compounds such as quartz, halite, or sodium anorthite, with dolomite and calcite also present less significantly.
Considering the diffraction patterns recorded with the rocks collected from the four representatives basins in Romania, presented in figure 1, it resulted that they consist of the following substances: anorthite (CaO[Al.