Definition of oligoclase in English:
A feldspar mineral common in siliceous igneous rocks, consisting of a sodium-rich plagioclase (with more calcium than albite).
- It is composed of quartz, oligoclase, and microcline, with minor garnet, biotite, muscovite and iron-oxides.
- Here it was found sparsely as rounded grains associated with pargasite, diopside, oligoclase and lazurite.
- They range from bytownite - labradorite in basalts and gabbros, andesine - oligoclase in diorites and andesites to albite in granites and rhyolites.
Definition of oligoclase in:
- British & World English dictionary
What do you find interesting about this word or phrase?
Comments that don't adhere to our Community Guidelines may be moderated or removed.
Most popular in the US
Most popular in the UK
Most popular in Australia
Most popular in Malaysia