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oligoclaseenUK
ol·i·go·clase O0065300 (ŏl′ĭ-gō-klās′, -klāz′, ō′lĭ-)n. A white, gray, green or red variety of plagioclase feldspar that contains a higher proportion of sodium than calcium and is common in silica-rich igneous rocks.
[oligo- + Greek klasis, cleavage (from klān, to break; see plagioclase feldspar).]oligoclase (ˈɒlɪɡəʊˌkleɪs) n (Minerals) a white, bluish, or reddish-yellow feldspar mineral of the plagioclase series, consisting of aluminium silicates of sodium and calcium. Formula: NaAlSi3O8.CaAl2Si2O8[C19: from oligo- + -clase]ol•i•go•clase (ˈɒl ɪ goʊˌkleɪs)
n. a plagioclase feldspar occurring in white, gray, greenish, or reddish crystals. [1825–35] Thesaurus| Noun | 1. | oligoclase - any of a series of triclinic feldspars that form rocksplagioclasedacite - a grey volcanic rock containing plagioclase and quartz and other crystalline mineralsbasalt - the commonest type of solidified lava; a dense dark grey fine-grained igneous rock that is composed chiefly of plagioclase feldspar and pyroxenefeldspar, felspar - any of a group of hard crystalline minerals that consist of aluminum silicates of potassium or sodium or calcium or bariumalbite, white feldspar - a widely distributed feldspar that forms rocksanorthite - rare plagioclastic feldspar occurring in many igneous rocks |
OligoclaseenUK
oligoclase[′äl·ə·gō‚klās] (mineralogy) A plagioclase feldspar mineral with a composition ranging from Ab90 An10 to Ab70 An30, where Ab = NaAlSi3O8 and An = CaAl2O8. Oligoclase a rock-forming mineral of the feldspar (plagio-clase) group; an isomorphous mixture of 10–30 percent anorth-ite, Ca[Al2Si2O8], and 70–90 percent albite, Na[AlSi3O8]. oligoclaseenUK
Synonyms for oligoclasenoun any of a series of triclinic feldspars that form rocksSynonymsRelated Words- dacite
- basalt
- feldspar
- felspar
- albite
- white feldspar
- anorthite
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