ol·i·go·clase ( l  -g -kl s , -klz, l-)n. See plagioclase. [oligo- + Greek klasis, cleavage (from kl n, to break; see plagioclase).] |
oligoclase [ˈɒlɪgəʊˌkleɪs]
n
(Earth Sciences / Minerals) a white, bluish, or reddish-yellow feldspar mineral of the plagioclase series, consisting of aluminium silicates of sodium and calcium. Formula: NaAlSi3O8.CaAl2Si2O8
[from oligo- + -clase]
| oligoclase (l-g-kls, l-) A white to gray triclinic mineral of the plagioclase feldspar group. Oligoclase occurs in igneous rocks with a relatively high silica content, such as granite. Chemical formula: (Na,Ca)(Al,Si)AlSi2O8. |
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. | oligoclase - any of a series of triclinic feldspars that form rocks dacite - a grey volcanic rock containing plagioclase and quartz and other crystalline minerals basalt - the commonest type of solidified lava; a dense dark grey fine-grained igneous rock that is composed chiefly of plagioclase feldspar and pyroxene feldspar, felspar - any of a group of hard crystalline minerals that consist of aluminum silicates of potassium or sodium or calcium or barium albite, white feldspar - a widely distributed feldspar that forms rocks anorthite - rare plagioclastic feldspar occurring in many igneous rocks |
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