oligoclase

/ol-i-goh-kleys/US // ˈɒl ɪ goʊˌkleɪs //UK // (ˈɒlɪɡəʊˌkleɪs) //

寡晶石,橄榄石,橄榄核,寡头石

Definitions

n.名词 noun

1
Mineralogy.
- : a kind of plagioclase feldspar occurring commonly in white crystals, sometimes shaded with gray, green, or red.

These intermediate members are the lime-soda felspars known as oligoclase, andesine, labradorite and bytownite.
The felspar of the granulites is mostly orthoclase or cryptoperthite; microcline, oligoclase and albite are also common.
The felspar ranges from bytownite to oligoclase, being usually a variety of labradorite; orthoclase is scarce.
At Danbury the mineral occurs with microcline and oligoclase embedded in dolomite.
Amelia Court House, Virginia, is another locality whence come pieces either of orthoclase or oligoclase exhibiting this property.