oligoclase
oligoclase[ˈɒlɪgə(ʊ)kleɪz]noun- [mass noun]a feldspar mineral common in siliceous igneous rocks, consisting of a sodium-rich plagioclase (with more calcium than albite)
奥长石
语源- mid 19th cent.: from oligo- 'relatively little' + Greek klasis 'breaking' (because thought to have a less perfect cleavage than albite)
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