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