an·or·thite ( n-ôr th t)n. A rare plagioclase feldspar with high calcium oxide content occurring in igneous rocks. [From Greek an-, not; see a-1 + orthos, straight (from its oblique crystals).] an  or·thitic (-th tk) adj. |
anorthite [ænˈɔːθaɪt]
n
(Earth Sciences / 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
[from an- + ortho- + -ite1]
anorthitic [ˌænɔːˈθɪtɪk] adj
| anorthite (n-ôrtht) A white to gray triclinic mineral of the plagioclase feldspar group. Anorthite is the plagioclase mineral that is richest in calcium and occurs in alkaline igneous rocks such as gabbro. Chemical formula: CaAl2Si2O8. |
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. |  anorthite - rare plagioclastic feldspar occurring in many igneous rocksoligoclase, plagioclase - any of a series of triclinic feldspars that form rocks |
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